Name

SAITO, Kiyoshi

Official Title

Professor

Affiliation

(School of Fundamental Science and Engineering)

Contact Information

Address・Phone Number・Fax Number

Address
3-4-1, Okubo, Sinjuku, Tokyo, Japan, 169-8555
Phone Number
+81-3-5286-3259
Fax Number
+81-3-5286-3259

URL

Web Page URL

http://www.saito.mech.waseda.ac.jp

Grant-in-aids for Scientific Researcher Number
90287970

Sub-affiliation

Sub-affiliation

Faculty of Science and Engineering(Graduate School of Fundamental Science and Engineering)

Affiliated Institutes

理工学総合研究センター

兼任研究員 1989-2006

先端生産システム研究所

プロジェクト研究所所長 2011-2011

動力エネルギーシステム研究所

研究所員 2014-2019

熱エネルギー変換工学・数学融合研究所

プロジェクト研究所所長 2017-2021

環境エネルギー技術総合研究所

プロジェクト研究所所長 2011-2016

環境エネルギー技術総合研究所

プロジェクト研究所所長 2016-2016

環境エネルギー技術総合研究所

研究所員 2016-2016

熱エネルギー変換工学・数学融合研究所

研究所員 2017-

理工学術院総合研究所(理工学研究所)

兼任研究員 2006-2018

理工学術院総合研究所(理工学研究所)

兼任研究員 2018-

数理エネルギー変換工学研究所

プロジェクト研究所所長 2018-2019

環境経済・経営研究所

研究所員 2018-

動力エネルギーシステム研究所

研究所員 2019-

数理エネルギー変換工学研究所

研究所員 2018-2019

Educational background・Degree

Educational background

-1992 Waseda University Faculty of Science and Engineering mechanical engineering
-1997 Waseda University Graduate School, Division of Science and Engineering Mechanical engineering

Degree

Dr. Engineering Coursework Waseda University Thermal engineering

Career

1996-1998Research associate, Waseda University
1999-2000Domestic research fellow,
2000-National Institute for Resources and Environment
2002-Associate professor, Waseda University
2008-Present Professor
2011-Visiting professor, University of the philippines
2014-Adjunct professor, University of Indonesia

Research Field

Keywords

Dynamics, Robotics, Energy saving, Air conditioning, Environmental engineering

Grants-in-Aid for Scientific Research classification

Engineering / Mechanical engineering / Intelligent mechanics/Mechanical systems

Engineering / Mechanical engineering / Dynamics/Control

Engineering / Mechanical engineering / Thermal engineering

Cooperative Research Theme Desire

Heat transfer enhancement of absorber of absorption refrigerator

Institution:Cooperative research with other research organization including private (industrial) sectors

Purpose:Collaboration research

Autonomous working type air conditioning system

Institution:Cooperative research with other research organization including private (industrial) sectors

Purpose:Collaboration research

Analysis of thermal systems

Institution:Cooperative research with other research organization including private (industrial) sectors

Purpose:Sponsord research、Collaboration research

Technology Seeds

Research interests Career

Study on the characteristics of an absorption refrigerator

Current Research Theme Keywords:Absorption refrigerator,Simulation,Modeling

Individual research allowance

Performance analysis of a hybrid air-conditioning system

Current Research Theme Keywords:Compression type refrigerator,Absorption refrigerator,Hybrid

Cooperative Research within Japan

Dynamics and control of the triple effect absorption refrigerator

Current Research Theme Keywords:Absorption refrigerator,Dynamics Control

Cooperative Research within Japan

Paper

Pressure drop and heat transfer during two-phase flow vaporization of propane in horizontal smooth minichannels

Kwang-Il Choi,A.S.Pamitran,Jong-Taek Oh,Kiyoshi Saito

Elsevier no.32p.837 - 8452008-

サイクル再熱除湿方式における室温・湿度制御方法の検討

中村啓夫・舟越砂穂・横山英範・森本素生・齋藤潔

日本冷凍空調学会論文集2009 Vol.26,No.4p.417 - 4272009/09-

サイクル再熱除湿方式ルームエアコンにおける除湿性能向上

中村啓夫・舟越砂穂・横山英範・森本素生・齋藤潔

日本冷凍空調学会論文集2009 Vol.26,No.4p.405 - 4162009/09-

Development of General-purpose Energy System Analysis Software“ENERGY FLOW+M"-Static analysis of Co2 heat pump system

Jong-Soo Jeong,Kiyoshi Saito

2009 WINTER ANNUAL CONFERENCE 2009/11-

Heat and mass transfar of zeolite desiccant wheel with simulation and experiment

Seiichi YAMAGUCHI,Kiyoshi SAITO,and Sunao KAWAI

International Workshop on Environment&Enpineering2009 2009/11-

EFFECT OF DESIGN AND OPERATING CONDITIONS ON PERFORMANCE OF DESICCANT WHEELS

Kenichi Tsutsui,Seiichi Yamaguchi,Kiyoshi Saito,Naoki Onda

IIR 2008 HVAC energy efficiency best practice conference,Melbourne 2008-

PERFORMANCE ANALYSIS OF MULTI-PARTITION DESICCANT WHEEL

J.JEONG,S.YAMAGUCHI,K.SAITO,S.KAWAI

8th IIR Gustav Lorentzen Conference on Natural Working Fluids,Copenhagen,2008 2008-

PERFORMANCE ENHANCEMENT OF COMPRESSION TYPE REFRIGERATOR WITH FOUR-PARTITION DESICCANT WHEEL

M.Hiramatsu,S.Yamaguchi,K.Saito,S.Kawai

IIR 2008 HVAC energy efficiency best practice conference,Melbourne 2008-

PERFORMANCE EVALUATION OF DESICCANT DEHUMIDIFICATION SYSTEMS WITH LOW-GRADE HEAT SOURCE

Jongsso.JEONG,Seiichi.YAMAGUCHI,Kiyoshi.SAITO,Sunao.KAWAI,Naoki.ONDA

HVAC energy efficiency best practice conference,Melbourne in Australia,2008 2008-

STATIC SIMULATION AND EXPERIMENT OF CO2 HEAT PUMP WATER HEATER

D.KATO,S.YAMAGUCHI,K.SAITO,S.KAWAI

8th IIR Gustav Lorentzen Conference on Natural Working Fluids,Copenhagen,2008 2008-

WIDE RANGE UNSTEADY-STATE SIMULATION OF COMPRESSION TYPE REFRIGERATOR WITH MODULAR ANALYSIS

K.OHNO,H.NAKAMURA,K.SAITO

IIR 2008 HVAC energy efficiency best practice conference,Melbourne 2008-

STATIC ANALYSIS OF DESICCNAT WHEEL 1ST REPORT :CONSTRUCTION OF SIMULATION MODEL AND INVESTIGATION OF VALIDITY OF THE MODEL

S.YAMAGUCHI,K.SAITO,S.KAWAI,M.OKA,T.MURAKAMI,and H.SASAKI

PROCEEDINGS The 22nd International Congress of Refrigeration 2007,Beijing. 2007/08-

STATIC ANALYSIS OF DESICCNAT WHEEL 2ND REPORT:PERFORMANCE ANALYSIS AND OPTIMUM DESIGN OF THE DESICCANT WHEEL

S.YAMAGUCHI,K.SAITO,S.KAWAI,M.OKA,T.MURAKAMI,and H.SASAKI

PROCEEDINGS The 22nd International Congress of Refrigeration 2007,Beijing. 2007/08-

STUDY ON OPTIMUM DESIGN METHOD OF ABSORPTION REFRIGERATOR 2ND REPORT:APPLICATION TO DOUBLE EFFECT ABSORPTION CYCLE

J.JEONG,K.SAITO,S.KAWAI

PROCEEDINGS The 22nd International Congress of Refrigeration 2007,Beijing. 2007/08-

Efficiency Enhancement of Chiller and Heat Pump Using Natural Working Fluids with Two-phase Flow Ejector, 1st report

Choiku Yoshikawa, Jeongsoo Jeong, Kazuhiro Hattori, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigerating and Air Conditioning Engineers 21(1) p.1 - 122004-

Efficiency Enhancement of Chiller and Heat Pump Using Natural Working Fluids with Two-phase Flow Ejector, 2nd report

Choiku Yoshikawa, Jeongsoo Jeong, Kazuhiro Hattori, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigerating and Air Conditioning Engineers 21(1) p.13 - 212004-

Efficiency Enhancement of Chiller and Heat Pump Using Natural Working Fluids with Two-phase Flow Ejector, 3rd report

Choiku Yoshikawa, Jeongsoo Jeong, Kazuhiro Hattori, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigerating and Air Conditioning Engineers 21(1) p.23 - 312004-

Characteristic analysis of an Efficient Hybrid Air Conditioning System

Jongsoo Jeong, Kiyoshi Saito, Sunggun Hyun, Sunao Kawai, Noriyuki Nishiyama, Choiku Yoshikawa

Japan Society of Mechanical Engineers 69(685) p.130 - 1372003-

Heat transfer and pressure drop characteristics of enhanced titanium tubes

Kyudae Hwang, Jongsoo Jeong, Sunggun Hyun, Kiyoshi Saito, Sunao Kawai, Katuyuki Inagaki, Yuji Ozawa

Desalination, Elsevier 159p.33 - 412003-

Study on the Efficient Drive of a Desiccant Air Conditioning System

Jong Soo Jeong, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigerating and Air Conditioning Engineers 20(2) p.147 - 1542003-

Static Characteristics of WMVR Hybrid Absorption Refrigerator Driven by Waste Heat and Motive Power

Sungun Hyun, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigerating and Air Conditioning Engineers 17(3) p.297 - 3052000-

Study on the Start-Up Characteristics of Double-Effect Absorption Refrigerator Driven by Waste Steam

Kiyoshi Saito, Sunao Kawai, Noriyuki Nishiyama

Heat transfer Asian Research, Scripta Technica 29(5) p.427 - 4452000-

DYNAMIC CHARACTERISTICS OF GENERATOR FOR AN ABSORPTION REFRIGERATOR(The Pool Boiling and The Falling Film Type Generator)

SungGun HYUN,Kiyoshi SAITO,Hiroshi OSHITANI,Sunao KAWAI

Twentieth International Congress of Refrigeration 1999/09-

Dynamic Characteristics of the Generator for Absorption Refrigerator(1<SUP>st</SUP>Report : Pool Boiling Type Generator)

Sung Gun Hyun, Kiyoshi Saito, Sunao Kawai

Japan Society of Mechanical Engineers 65(631) p.256 - 2631999-

Dynamic Characteristics of the Generator for Absorption Refrigerator(2<SUP>nd</SUP> Report : Falling Film Type Generator)

Sung Gun Hyun, Kiyoshi Saito, Hiroshi Oshitani, Sunao Kawai

Japan Society of Mechanical Engineers 65(638) p.211 - 2181999-

Experimental Investigation on the Characteristics of the Ammonia-Water Absorption Refrigerator for Low Temperature Solution Cycle

Toshitaka Takei, Sinji Kimijima, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigeration and Air conditioning Engineers 14(1) p.27 - 381997-

Study on the Dynamic Characteristics of the Double-Effect Absorption Refrigerator Driven by Waste Steam

Kiyoshi Saito, Sunao Kawai, Noriyuki Nishiyama

Japan Society of Mechanical Engineers 63(608) p.269 - 2761997-

Study on the Start-Up Characteristics of a Double-Effect Absorption Refrigerator Driven by Waste Steam

Kiyoshi Saito, Noriyuki Nishiyama, Sunao Kawai

Japan Society of Mechanical Engineers 63(615) p.201 - 2091997-

Investigation of the influence of cooling water inlet temperature on characteristics and ammonia charging quantity of ammonia water absorption refrigerator

Toshitaka Takei, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigeration and Air conditioning Engineers 13(1) p.57 - 651996-

Simulation Analysis of the NH3-H2O Two-Stage Desorption Type Absorption Refrigerator Driven by Low Grade Waste Heat

Toshitaka Takei, Sinji Kimijima, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigeration and Air conditioning Engineers 13(1) p.77 - 881996-

Simulation and Experimental Research of Start-up Characteristics of Single-Effect Absorption Refrigerators Driven by Waste Hot Water

Naoki Sugano, Kiyoshi Saito, Sunao Kawai, Noriyuki Nishiyama, Ritu Homma

Japan Society of Mechanical Engineers 62(596) p.304 - 3101996-

Study on the effect of the difference of Absorption Cycles on the Characteristics of Double-Effect Absorption Refrigerator

Kiyoshi Saito, Hiroteru Igarashi, Sunao Kawai

Japan Society of Mechanical Engineers 62(595) p.361 - 3671996-

Evaluation of Enthalpy for NH3-H20 Absorption Refrigerator

Toshitaka Takei, Kiyoshi Saito, Sunao Kawai

Japan Society of Refrigerating and Air Conditioning Engineers 12(1) p.95 - 1051995-

Simulation and Experimental Research of Dynamic Characteristics of Single-Effect Absorption Refrigerator Driven by Waste Hot Water

Naoki Sugano, Kiyoshi Saito, Sunao Kawai, Noriyuki Nishiyama, Ritu Homma, Hiroki Wakimizu

Japan Society of Mechanical Engineers 60(576) p.290 - 2961994-

Studies on the Characteristics of Absorption Refrigerator Driven by Two Different Heat Sources, 1st report

Kiyoshi Saito, Naoki Sugano, Sunao Kawai, Noriyuki Nishiyama, Ritu Homma, Hiroki Wakimizu

Japan Society of Mechanical Engineers 60(573) p.250 - 2571994-

Studies on the Characteristics of Absorption Refrigerator Driven by Two Different Heat Sources, 2nd report

Noriyuki Nishiyama, Ritu Homma, Hiroki Wakimizu, Sunao Kawai, Naoki Sugano, Kiyoshi Saito

Japan Society of Mechanical Engineers 60(573) p.258 - 2641994-

Performance analysis of four-partition desiccant wheel and hybrid dehumidification air-conditioning system

Jongsoo Jeong,Seiichi Yamaguchi,Kiyoshi Saito,Sunao Kawai

Elsevier

ゼオライト系デシカントローターの性能評価実験と静特性解析

山口誠一(早大),齋藤潔(早大),恩田直樹(東京ガス)

日本機械学会第19回環境工学総合シンポジウム2009論文集 2009/07-

リキッドデシカントシステムにおける除湿・再生用充鎮層における熱・物質移動特性と圧力損失

伊藤卓(早大),山口誠一(早大),齋藤潔(早大),河合素直(早大)

日本機械学会第19回環境工学総合シンポジウム2009論文集 2009/07-

単効用吸収冷凍機の断続運転特性解析

大野慶祐(早大院),西山教之(東京ガス),齋藤潔(早大)

日本機械学会第19回環境工学総合シンポジウム2009論文集 2009/07-

シリカゲル系デシカントローターの高精度シュミレーションモデルの構築

山口 誠一(早大),齋藤 潔(早大),河合 素直(早大),恩田 直樹(東京ガス)

第43回空気調和・冷凍連合講演会講演論文集 2009/04-

エネルギーシステム汎用解析ソフト“ENERGY FLOW+M”の開発 -第1報 圧縮式冷凍機の静特性解析-

大野 慶祐(早大院),齋藤 潔(早大基幹理工),中村 英明(アサンキャ)

2008年度日本冷凍空調学会年次大会講演論文集 2008/10-

エネルギーシステム汎用解析ソフト“ENERGY FLOW+M”の開発 -第2報 デシカント空調システムの静特性解析-

平松 雅弘(早大院),齋藤 潔(早大基幹理工),中村 英明(アサンキャ)

2008年度日本冷凍空調学会年次大会講演論文集 2008/10-

デシカントローターにおける熱・物質移動特性の検討と静特性解析

山口 誠一(早大理工),齋藤 潔(早大理工),河合 素直(早大理工),恩田 直樹(東京ガス)

2008年度日本冷凍空調学会年次大会講演論文集 2008/10-

リキッドデシカントシステムの吸収・再生器用充填層における熱・物質移動特性の解明

山口 誠一(早大基幹理工),齋藤 潔(早大基幹理工),河合 素直(早大基幹理工)

2008年度日本冷凍空調学会年次大会講演論文集 2008/10-

汎用熱システム解析手法の確立への試み -第5報 圧縮式冷凍機の起動・停止解析への適用-

大野 慶祐(早大院),齋藤 潔(早大基幹理工),中村 啓夫(早大)

2008年度日本冷凍空調学会年次大会講演論文集 2008/10-

シリカゲル系デシカントローターの性能評価と特性解析

山口 誠一(早大),齋藤 潔(早大),河合 素直(早大),恩田 直樹(東京ガス)

日本機械学会・第18回環境工学総合シンポジウム2008 CD-ROM論文集 2008/07-

デシカントローターの占有体積を最小化する最適設計手法に関する検討

山口 誠一(早大),齋藤 潔(早大),河合 素直(早大),佐々木 裕文(東京ガス),恩田 直樹(東京ガス)

2007年度日本冷凍空調学会年次大会講演論文集 2007/10-

開放型吸収式除湿機の除湿・再生器における圧力損失と熱・物質移動特性

山口 誠一(早大),齋藤 潔(早大),河合 素直(早大)

2007年度日本冷凍空調学会年次大会講演論文集 2007/10-

開放型吸収式除湿機の性能試験とシュミレーション

井出 順(早大院),山口 誠一(早大),齋藤 潔(早大),河合 素直(早大)

2007年度日本冷凍空調学会年次大会講演論文集 2007/10-

吸収ヒートポンプ式蒸気発生装置の開発

梶山 啓輔,岡 雅博(東京ガス),福住 幸大,入江 毅一(荏原製作所),河合 素直,齋藤 潔(早稲田大学)

2007年度日本冷凍空調学会年次大会講演論文集 2007/10-

汎用熱システム解析手法の確立への試み 第5報 吸収式冷凍機の動特性解析への適用

木暮 悠樹(早大院),齋藤 潔(早大),岡 雅博(東京ガス),佐々木 裕文(東京ガス),河合 素直(早大)

2007年度日本冷凍空調学会年次大会講演論文集 2007/10-

Static analysis of desiccant wheel 1st report

Seiichi Yamaguchi, Kiyoshi Saito, Sunao Kawai, Masahiro Oka

International congress of refrigeration Beijing 2007/08-

Static analysis of desiccant wheel 2nd report

Seiichi Yamaguchi, Kiyoshi Saito, Sunao Kawai, Masahiro Oka

nternational congress of refrigeration, Beijing 2007/08-

4分割デシカントローターの性能評価

柴尾 雄人(早大院),山口 誠一(早大院),齋藤 潔(早大理工),河合 素直(早大理工)

第41回空気調和・冷凍連合講演会講演論文集 2007/04-

第2種吸収式ヒートポンプの性能試験と特性解析

木暮悠樹(早大院),齋藤 潔(早大理工),河合素直(早大理工),福住幸大(荏原製作所),梶山啓輔(東京ガス)

第41回空気調和・冷凍連合講演会講演論文集 2007/04-

Licl 水溶液を用いた開放型吸収式除湿機の実運転状況における特性解析

井出 順(早大院),松下 俊一郎(早大院),山口 誠一(早大院),齋藤 潔(早大理工),河合 素直(早大理工)

2006年度日本冷凍空調学会年次大会講演論文集 2006/10-

デシカントローターの静特性解析 第2報 構造および運転条件がデシカントローターの性能に与える影響の検討

山口 誠一(早大院),森 博孝(早大院),齋藤 潔(早大理工),河合 素直(早大理工),岡 雅博(東京ガス),村上 高(東京ガス),佐々木 裕文(東京ガス),恩田 直樹(東京ガス)

2006年度日本冷凍空調学会年次大会講演論文集 2006/10-

デシカントローターの静特性解析 第1報 デシカントローターの数値解析モデルの構築とその妥当性の検証

森 博孝(早大院),山口 誠一(早大院),齋藤 潔(早大理工),河合 素直(早大理工),岡 雅博(東京ガス),村上 高(東京ガス),佐々木 裕文(東京ガス),恩田 直樹(東京ガス)

2006年度日本冷凍空調学会年次大会講演論文集 2006/10-

三重効用吸収冷凍機のフローによる性能比較

大谷 真人(早大院),齋藤 潔(早大理工),河合 素直(早大理工)

2006年度日本冷凍空調学会年次大会講演論文集 2006/10-

除・加湿プロセスの多段化によるデシカント空調システムの駆動熱源温度の低温化に関する検討

柴尾 雄人(早大院),山口 誠一(早大院),齋藤 潔(早大理工),河合 素直(早大理工)

2006年度日本冷凍空調学会年次大会講演論文集 2006/10-

Efficiency enhancement of absorption refrigerator with two phase flow ejector

Jeongsoo Jeong, Kiyoshi Saito, Choiku Yoshikawa, Sunao Kawai

7th Gustav Lorentzen Conference on NWF, Trondheim, Norway 2006/05-

2段除湿・2段再生によるデシカントロータの高性能化

柴尾 雄人(早大院),山口 誠一(早大院),鄭 宗秀(早大),稲垣 勝之(トーセツ),齋藤 潔(早大),河合 素直(早大)

第40回空気調和・冷凍連合講演会講演論文集 2006/04-

水冷媒ハイブリッド冷凍機の高性能化に向けた制御手法の検討

並木 晴史(早大院),山口 誠一(早大院),鄭 宗秀(早大),稲垣 勝之(トーセツ),齋藤 潔(早大),河合 素直(早大)

第40回空気調和・冷凍連合講演会講演論文集 2006/04-

Performance Enhancement on Gas Fired Water Heater using Titanium Heat Exchanger for Latent Heat Recovery

黄奎大,玄成建,齋藤潔,河合素直

日本エネルギー学会誌/日本エネルギー学会 84(1) p.62 - 672005/12-

Licl 水溶液を用いた開放型吸収式除湿機の特性評価 第2報 システムの特性解析

山口 誠一(早大院),松下 俊一郎(早大院),鄭 宗秀(早大理工),齋藤 潔(早大理工),稲垣 勝之(トーセツ),本郷 賢(三建)

2005年度日本冷凍空調学会年次大会講演論文集 2005/10-

Licl 水溶液を用いた開放型吸収式除湿機の特性評価 第1報 除湿部および再生部の特性解析

山口 誠一(早大院),松下 俊一郎(早大院),鄭 宗秀(早大理工),齋藤 潔(早大理工),稲垣 勝之(トーセツ),本郷 賢(三建)

2005年度日本冷凍空調学会年次大会講演論文集 2005/10-

圧縮・吸収ハイブリッド空調システムの起動特性解析

寺島 陽生(早大院),齋藤 潔(早大理工),河合 素直(早大理工),鄭 宗秀(早大理工),竹内 由実(東京ガス),刑部 尚樹(東京ガス)

2005年度日本冷凍空調学会年次大会講演論文集 2005/10-

水冷媒を用いたハイブリッド冷凍機の特性解析

鄭 宗秀(早大),稲垣 勝之(トーセツ),齋藤 潔(早大)

2005年度日本冷凍空調学会年次大会講演論文集 2005/10-

Performance evaluation of open type absorption dehumidifier using LiCl solution as liquid desiccant

Shumichiro Matsushita, Seiichi Yamaguchi, Kiyoshi Saito, Sunao Kawai

International sorption conference, Denver, CO, USA 2005/06-

Dynamic characteristics of absorption and compression type hybrid air conditioning system

Haruo Terashima, Kiyoshi Saito, Jeongsoo Jeong

TFEC6, JEJU, Korea 2005/03-

Efficiency enhancement of absorption chiller using NH3-H2O with two phase flow ejector

Jongsoo Jeong, Kiyoshi Saito, Sunao Kawai, Choiku Yoshikawa, Kazuhiro Hattori

TFEC6, JEJU, Korea 2005/03-

Performance Evaluation of Latent Heat Recovery Heat Exchanger Using Enhanced Titanium Tubes for Gas Fired Water Heater

Kyudae Hwang, Kiyoshi Saito, Sunao Kawai, Katsuyuki Inagaki, RYuji Ozawa

TEFC6, JEJU, KOREA 2005/03-

Licl 水溶液を用いた開放型吸収式除湿機の性能評価 第1報:シュミレーションによる性能評価

稲垣 勝之(トーセツ),久保田 薫(トーセツ),本郷 賢(三建),高橋 英信(三建),鄭 宗秀(早大院),齋藤 潔(早大),荻須 吉洋(早大),河合 素直(早大)

2004年度日本冷凍空調学会年次大会講演論文集 2004/10-

NAS電池排熱を利用したCO2給湯機の性能評価

和田 知記(早大院),齋藤 潔(早大理工),草鹿 仁(早大理工),河合 素直(早大理工),荻須 吉洋(早大),山下 牧夫(東京電力),黒本 英智(東京電力)

2004年度日本冷凍空調学会年次大会講演論文集 2004/10-

プラズマ親水性表面処理による蒸発伝熱促進に関する実験的研究

黄 奎大(早大院),齋藤 潔(早大理工),河合 素直(早大理工),姜 炳夏(韓国国民大学)

2004年度日本冷凍空調学会年次大会講演論文集 2004/10-

排ガス駆動吸収例温水機の開発(第2報)

井上修行,遠藤哲也,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 21(2) p.109 - 1202004/09-

排ガス駆動吸収例温水機の開発(第1報)

井上修行,遠藤哲也,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 21(2) p.97 - 1082004/08-

高設定温度,高換気量に対応可能な次世代空調方式に関する研究

稲垣勝之(トーセツ),中川安明(トーセツ),齋藤 潔(早大理工),河合 素直(早大理工)

第38空気調和・冷凍連合講演会講演論文集 2004/04-

自然冷媒を用いた冷凍機・ヒートポンプのエジェクターによる高効率化に関する研究(第1報)

吉川朝郁,鄭宗秀,服部一裕,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 21(1) p.1 - 122004/03-

自然冷媒を用いた冷凍機・ヒートポンプのエジェクターによる高効率化に関する研究(第2報)

吉川朝郁,鄭宗秀,服部一裕,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 21(1) p.13 - 222004/03-

自然冷媒を用いた冷凍機・ヒートポンプのエジェクターによる高効率化に関する研究(第3報)

吉川朝郁,鄭宗秀,服部一裕,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 21(1) p.23 - 312004/03-

Heat and mass transfer characteristics in gas fired water heater with titanium heat exchanger for latent heat recovery

Kyudae Hwang, Sunggun Hyun, Kiyoshi Saito, Sunao Kawai, Katuyuki Inagaki, Ryuji Ozawa

6th international symposium on Heat Transfer p.790 - 7952004-

超高効率ハイブリッド空気調和システムの特性解析(第一報,圧縮・吸収ハイブリッドサイクルの性能評価)

鄭宗秀,齋藤潔,玄成建,河合素直,西山教之,吉川朝郁

日本機械学会論文集/日本機械学会 69(685) p.130 - 1372003/09-

Heat Transfer and Pressure Drop Characteristics of Enhanced Titanium Tubes

Kyudae Hwang, Jeongsoo Jeong, Sunggun Hyun, Kiyoshi Saito, Sunao Kawai, Katsuyuki Inagaki, Ryuji Ozawa

Desalination/Elsevier 159p.33 - 412003/08-

吸収サイクルの動特性解析

齋藤潔

日本冷凍空調学会 冷凍 78(909) p.41 - 472003/07-

Study on the Efficient Drive of a Desiccant Air Conditioning System

Jong-Soo Jeong, Kiyoshi Saito, Sunao Kawai

日本冷凍空調学会論文集/日本冷凍空調学会 20(2) p.257 - 2642003/05-

多重効用サイクルによる吸収冷凍機の高効率化(第1報)

井上修行,入江智芳,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 20(4) p.461 - 4722003/04-

多重効用サイクルによる吸収冷凍機の高効率化(第2報)

井上修行,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 20(4) p.473 - 4842003/04-

汎用熱システム解析手法の確立への試み(第3報:動特性解析の基本的な考え方)

齋藤 潔(早大理工),尾崎 純也(早大理工),鄭 宗秀(早大院),河合 素直(早大理工)

第37回空気調和・冷凍連合講演会講演論文集 2003/04-

汎用熱システム解析手法の確立への試み(第4報:圧縮式冷凍機の動特性解析への適用)

鄭 宗秀(早大院),尾崎 純也(早大理工),齋藤 潔(早大理工),河合 素直(早大理工)

第37回空気調和・冷凍連合講演会講演論文集 2003/04-

Optimum Design Method of an Absorption Refrigerator(-1st report : Single Effect Absorption Cycle -)

Jeongsoo Jeong, Sunggun Hyun, Kiyoshi Saito, Sunao Kawai

The 6th ASME-JSME Thermal Engineering Joint Conference, Hawaii, USA 2003/03-

Experimental Investigation for Performance Improvement of Lower Horizontal Tubes of Absorber in H2O/LiBr Absorption Refrigeration System

Proceeding of the SAREK 2003 Winter Annual Conference 2003-

Optimum Design Method for an Single Effect Absorption Refrigerator Based on the First and Second Law Analysis

Jeongsoo Jeong, Kiyoshi Saito, Sunao Kawai

Proc. of ,21st IIR International Congress of Refrigeration, Washington D.C., USA p.1 - 92003-

Performance Analysis of Advanced Air Cycle Refrigeration System

Kyudae Hwang, Sunggun Hyun, Takao Ando, Kiyoshi Saito, Sunao Kawai, Junji Matuda, Hirokazau Yoneda

Proc. of 21st IIR International Congress of Refrigeration, Washington D.C., USA 2003-

Performance Enhancement of Absorption Chiller Using NH3-H2O with Ejector

Proceeding of the SAREK 2003 Winter Annual Conference 2003-

Thermal Efficiency Enhancement on Gas-Fired Water Heater Using Titanium Heat Exchanger for Latent Heat Recovery

Kyudae Hwang, Sunggun Hyun, Jongsoo Jeong, Kiyoshi Saito, Sunao Kawai, Katuyuki Inagaki, Ryuji Ozawa

22nd World Gas Conference, Tokyo, Japan 2003-

アンモニア-水系吸収式冷凍機のエジェクターによる高効率化に関する検討

平成15年度日本冷凍空調学会学術講演会講演論文集 2003-

アンモニアを作動流体とした圧縮式冷凍機のエジェクターによる高性能化に関する研究

平成15年度日本冷凍空調学会学術講演会講演論文集 2003-

ガス給湯器用潜熱回収熱交換器の性能評価

第12回日本エネルギー学会大会論文集 2003-

圧縮・吸収ハイブリッド空調システムに関する研究(第2報:吸収式冷凍機が単効用サイクルの場合の高効率制御手法に関する検討)

第12回日本エネルギー学会大会論文集 2003-

圧縮・吸収ハイブリッド空調システムに関する研究(第3報:吸収式冷凍機に一重二重効用サイクルを採用した場合)

2003年度日本機械学会年次大会講演論文集(Ⅲ) 2003-

圧縮・吸収ハイブリッド空調システムに関する研究(第4報:吸収式冷凍機に一重二重効用サイクルを採用した場合の高効率制御手法に関する検討

平成15年度空気調和・衛生工学会学術講演会講演論文集 2003-

圧縮・吸収ハイブリッド空調システムに関する研究(第5報:吸収式冷凍機に排熱投入型二重効用サイクルを採用した場合)

平成15年度日本冷凍空調学会学術講演会講演論文集 2003-

圧縮・吸収ハイブリッド空調システムに関する研究(第6報:吸収式冷凍機に排熱投入型二重効用サイクルを採用した場合の高効率制御手法に関する検討)

平成15年度日本冷凍空調学会学術講演会講演論文集 2003-

吸収器の高性能化に関する実験(第一報 下段における伝熱性能改善の試み)

平成15年度日本冷凍空調学会学術講演会講演論文集 2003-

三重効用吸収冷凍機の性能評価と設計方法に関する検討

平成15年度日本冷凍空調学会学術講演会講演論文集 2003-

熱力学の第1,2法則に基づく単効用吸収式冷凍機の最適設計に関する検討

平成15年度日本冷凍空調学会学術講演会講演論文集 2003-

汎用熱システム解析手法の確立への試み(第3報:動特性解析の基本的な考え方

弟37回空気調和・冷凍連合講演論文集 2003-

汎用熱システム解析手法の確立への試み(第4報:圧縮式冷凍機の動特性解析への適用

第37回空気調和・冷凍連合講演論文集 2003-

Performance and Characteristic Analysis of a Super Efficient Hybrid Air conditioning System

Jongsoo Jeong, Sunggun Hyun, Kiyoshi Saito, Sunao Kawai

Proc. of the International Heat Pump Conference, Shanghai, China p.246 - 2542002/10-

Study on the Efficient Drive of a Desiccant Air Conditioning System

Jongsoo Jeong, Yuji Horiuchi, Sunggun Hyun, Kiyoshi Saito, Sunao Kawai

Proc. of the Asian Conference on Refrigeration and Air Conditioning 2002, Kobe, Japan p.203 - 2102002-

The Performance analysis of absorption heat pump which can supply the hot and the chilled water simultaneously

Sunggun Hyun, Toshiaki Kajitani, Jongsoo Jeong, Kiyoshi Saito, Sunao Kawai

Second International Conference on Energy Research & Development p.207 - 2162002-

ハイブリッドデシカント空調システムの性能評価

平成13年度日本冷凍空調学会学術講演会講演論文集 2001/10-

吸収冷凍機の最適設計に関する検討

平成13年度日本冷凍空調学会学術講演会講演論文集 2001/10-

汎用熱システム解析手法の確立への試み(第2報:吸収冷凍機への適用

平成13年度日本冷凍空調学会学術講演会講演論文集 2001/10-

Performance Analysis of a Super Efficient Hybrid Air-Conditioning System(first report: a Compression and Absorption Hybrid Cycle)

Jongsoo Jeong, Sunggun Hyun, Kiyoshi Saito, Sunao Kawai, Noriyuki Nishiyama, Choiku Yoshikawa, Hiroyuki Suzuki, Syuji Fukano

CIAR p.386 - 3952001/08-

水平管外流下液膜式蒸発器における流下液膜の流動特性と伝熱性能向上に関する実験的検討

日本機械学会2001年度年次大会講演論文集 2001/08-

冷温熱取り出し型吸収ヒートポンプの性能解析

日本機械学会第11回環境工学シンポジウム2001講演論文集 2001/07-

圧縮・吸収ハイブリッドヒートポンプの特性解析

第35回空気調和・冷凍連合講演会講演論文集 2001/04-

Performance analysis of WMVR hybrid refrigerator

Proc. of 4th JSME-KSME thermal engineering conference 2000/10-

超高効率ハイブリッド空調システムの研究(第1報:圧縮・吸収ハイブリッドサイクルの検討)

日本冷凍空調学会学術講演論文集/日本冷凍空調学会 2000/09-

超高効率ハイブリッド空調システムの研究(第2報:圧縮・排熱エジェクターハイブリッドサイクルの検討

日本冷凍空調学会学術講演論文集/日本冷凍空調学会 2000/09-

排熱ならびに動力を駆動源とするWMVRハイブリッド吸収冷凍機の特性解析

玄成建,齋藤潔,河合素直

日本冷凍空調学会論文集/日本冷凍空調学会 17(3) p.297 - 3052000/06-

Study on the start-up characteristics of dobule-effect absorption refrigerator driven by waste steam

Kiyoshi Saito, Sunao Kawai, Noriyuki Nishiyama

Heat transfer asian research/Scripta Technica 29(5) p.427 - 4452000/05-

日本機械学会奨励賞

2000-

吸収冷凍機用再生器の動特性解析(第2報:流下液膜式再生器)

玄成建,齋藤潔,押谷洋,河合素直

日本機械学会論文集 65(638) p.211 - 2181999/10-

吸収冷凍機用再生器の動特性解析(第1報:プール沸騰式再生器)

玄成建,齋藤潔,河合素直

日本機械学会論文集 65(631B) p.256 - 2631999/03-

Dynamic characteristics of generator for absorption refrigerator

Suggun Hyun, Kiyoshi Saito, Hiroshi Oshitani, Sunao Kawai

20th international congress of refrigeration, Sydney, Australia 1999-

STUDY ON THE CHARACTERISTICS OF AMMONIA-WATER ABSORPTION REFRIGERATOR

Kiyoshi Saito, Sinji Kimijima, Toshitaka Takei, Sunao Kawai

Natural working fluids 1998, Oslo, Norway p.503 - 5121998-

蒸気式二重効用吸収冷凍機の起動特性解析

齋藤潔,西山教之,河合素直

日本機械学会論文集 63(615B) p.201 - 2091997/11-

低温冷凍用アンモニア-水系吸収冷凍機の運転特性に関する実験・考察

武居俊孝,君島真仁,齋藤潔,河合素直

日本冷凍空調学会論文集 14(1) p.27 - 381997/05-

蒸気式二重効用吸収冷凍機の動特性解析

齋藤潔,西山教之,河合素直

日本機械学会論文集 63(608B) p.269 - 2761997/04-

吸収冷凍機の設計条件が動特性に与える影響の検討

日本機械学会講演論文集/日本機械学会 1997/03-

吸収冷凍機の動特性解析モデルの検討

日本機械学会講演論文集/日本機械学会 1997/03-

アンモニア-水系吸収冷凍機の精留器が特性に及ぼす影響の検討

日本機械学会講演論文集/日本機械学会 1996/09-

蒸気式二重効用吸収冷凍機の起動特性解析(第1報)

環境工学総合シンポジウム講演論文集/日本機械学会 1996/07-

蒸気式二重効用吸収冷凍機の起動特性解析(第2報)

環境工学総合シンポジウム講演論文集/日本機械学会 1996/07-

低温冷凍用アンモニア-水系吸収冷凍機の性能向上に関する検討

環境工学総合シンポジウム講演論文集/日本機械学会 1996/07-

吸収冷凍機用流下液膜式再生器の動特性解析モデルの検討

日本機械学会講演論文集/日本機械学会 1996/04-

単効用温水吸収冷凍機の起動特性解析

日本機械学会論文集/日本機械学会 62;5961996/04-

単効用吸収冷凍機の起動特性解析

菅野直紀,齋藤潔,河合素直,西山教之,本間立

日本機械学会論文集 62(596) p.304 - 3101996/04-

アンモニア-水系吸収冷凍機において冷却水温度がその特性(COP等)および冷媒充填量に与える影響の検討

武居俊孝,齋藤潔,河合素直

日本冷凍空調学会論文集 13(1) p.57 - 651996/03-

低温熱源駆動アンモニア-水系二段発生式吸収冷凍機のシミュレーション解析

武居俊孝,君島真仁,齋藤潔,河合素直

日本冷凍空調学会論文集 13(1) p.77 - 881996/03-

二重効用吸収冷凍機の吸収サイクルの構成法がその特性に与える影響の検討

齋藤潔,五十嵐洋晃,河合素直

日本機械学会論文集 62(595B) p.361 - 3671996/03-

アンモニア-水系吸収冷凍機のエンタルピ線図の評価

武居俊孝,齋藤潔,河合素直

日本冷凍空調学会論文集 12(1) p.95 - 1051995/03-

Study on the dynamic characteristics of double effect absorption refrigerator driven by waste steam

Kiyoshi Saito, Sunao Kawai, Noriyuki Nishiyama, Ritu Homma

19th international congress of refrigeration, Hague, Netherlands p.983 - 9901995-

温水だき単効用吸収冷凍機の動特性解析

菅野直紀,齋藤潔,河合素直,西山教之,本間立,脇水広記

日本機械学会論文集 60(576B) p.290 - 2961994/08-

二熱源駆動吸収冷凍機の特性解析(第1報)

齋藤潔,菅野直紀,河合素直,西山教之,本間立,脇水広記

日本機械学会論文集 60(573B) p.250 - 2571994/05-

二熱源駆動吸収冷凍機の特性解析(第2報)

齋藤潔,菅野直紀,河合素直,西山教之,本間立,脇水広記

日本機械学会論文集 60(573B) p.258 - 2641994/05-

Next generation gas driven air conditioning system under the condition of the higher setting temperature of the room in the cooling mode and higher ventilation

Katsuyuki Inagaki, Yasuaki Nakagawa, Kiyoshi Saito, Sunao Kawai

International refrigeration and air conditioning conference at Purdue

Performance analysis of four-partition desiccant wheel and hybrid dehumidification air-conditioning system

Jeong, Jongsoo;Yamaguchi, Seiichi;Saito, Kiyoshi;Kawai, Sunao

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 33(3) p.496 - 5092010-2010

DOI

Detail

ISSN:0140-7007

Performance Improvement of R 410A Room Air Conditioner by Vapor Injection Refrigeration Cycle using Scroll Compressor

NAKAMURA Hiroo;YOKOYAMA Hidenori;NONAKA Masayuki;SAITO Kiyoshi

86(1004) p.469 - 4702011/06-2011/06

CiNii

Detail

ISSN:00343714

Static characteristics and efficient control of compression- and absorption-type hybrid air conditioning system

Jeong, Jongsoo;Saito, Kiyoshi;Kawai, Sunao

INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID 34(3) p.674 - 6852011-2011

DOI

Detail

ISSN:0140-7007

Development and Validation of the High-precision Simulation Model for Desiccant Wheel : Numerical and Experimental Performance Analysis under Indoor Air Circulation Condition

YAMAGUCHI Seiichi;SAITO Kiyoshi

88(1028) p.409 - 4102013/06-2013/06

CiNii

Detail

ISSN:00343714

Irreversibility analysis of falling film absorption over a cooled horizontal tube

Giannetti, Niccolò; Rocchetti, Andrea; Saito, Kiyoshi; Yamaguchi, Seiichi

International Journal of Heat and Mass Transfer 88p.755 - 7652015/09-2015/09

DOIScopus

Detail

ISSN:00179310

Outline:© 2015 Elsevier Ltd. All rights reserved. Based on a numerical study of the water vapour absorption process in LiBr-H2O solution, for a laminar, gravity driven, viscous, incompressible liquid film, flowing over a horizontal cooled tube, irreversibilities related to fluid friction, heat transfer, mass transfer and their coupling effects have been locally and globally examined. The hydrodynamic description is based on Nusselt boundary layer assumptions. The tangential and normal velocity components, respectively obtained from momentum and continuity equations, have been used for the numerical solution of mass and energy transport equations in the two-dimensional domain defined by the film thickness and the position along the tube surface. Local entropy generation calculation can be performed referring to the calculated velocity, temperature and concentration fields. Results have been explored in different operative conditions, in order to examine comprehensively the impact of the various irreversibility sources and to identify the least irreversible solution mass flow-rate for the absorber. As a parallel, a refined understanding of the absorption process can be obtained. Considering absorption at the film interface and cooling effect at the tube wall, the analysis thermodynamically characterises the absorption process which occurs inside actual falling film heat exchangers and establishes a criterion for their thermodynamic optimisation. Results suggest the importance to operate at reduced mass flow rates with a thin uniform film. Meanwhile, tension-active additives are required to realise this condition.

Thermodynamic optimization of three-thermal irreversible systems

Giannetti, Niccolo; Rocchetti, Andrea; Saito, Kiyoshi

International Journal of Heat and Technology 34p.S83 - S902016/01-2016/01

DOIScopus

Detail

ISSN:03928764

Outline:Multi-temperature-level systems enlarge the prospects and degrees of freedom for an effective design and an environment-friendly use of energy. Based on a general thermodynamic model of three-thermal cycles and finite thermal capacity of the heat sources, this paper aims at the analysis and the performance optimization of these systems by considering the influence of irreversibility. Suitable dimensionless parameters for an overall optimization are introduced and their influence on the cycle efficiency is investigated. This approach identifies the limitations imposed to the physical processes by accounting for the inevitable dissipation due to their constrained duration and intensity, and constitutes a general thermodynamic criterion for the optimization of three-thermal irreversible systems. Dependence on the main factors is highlighted in a way that shows how to change them in order to improve the overall efficiency. Under this point of view, the analysis evaluates COP improvements and can be used to perform plant diagnostics, besides predicting the system performance. The use of this criterion is exemplified for the absorption chiller application case.

Solar air-conditioning system at the University of Indonesia

Yabase, Hajime; Saito, Kiyoshi; Lubis, Arnas; Alhamid, Idrus; Nasruddin,

International Journal of Technology 7(2) p.212 - 2182016/01-2016/01

DOIScopus

Detail

ISSN:20869614

Outline:© IJTech 2016. Indonesia's economic growth has continued at a steady rate of approximately 5% to 6% annually, and energy consumption in the entire country has been increasing year by year. Demand for air conditioning in buildings is expanding. In line with this expansion, a 239 kW solar air-conditioning system using a single-double effect combined absorption chiller was installed in a building at the University of Indonesia's Faculty of Engineering located in Depok city, near Jakarta, with the aim of reducing greenhouse gas emissions. We collected and analyzed data from this air-conditioning system to better comprehend its performance. We report the outline and the performance of the chiller and the air-conditioning system.

Entropy parameters for falling film absorber optimization

Giannetti, Niccolò; Rocchetti, Andrea; Lubis, Arnas; Saito, Kiyoshi; Yamaguchi, Seiichi

Applied Thermal Engineering 93p.750 - 7622016/01-2016/01

DOIScopus

Detail

ISSN:13594311

Outline:© 2015 Elsevier Ltd. All rights reserved. A local entropy generation analysis, for water vapor absorption in LiBr-H2O solution, is performed referring to velocity, temperature and concentration fields obtained from the numerical solution of mass and energy transport equations. The hydrodynamic description is based on Nusselt boundary layer assumption and the actual amount of irreversibility introduced is determined for an absorptive falling film over a cooled horizontal tube inside the absorber. Results are explored in different operative conditions in order to examine the impact of the various irreversibility sources in a wide operative range. A least irreversible solution mass flow-rate can always be identified. Furthermore, a simple and general thermodynamic analysis, carried out regarding a refrigerating and a heat boosting applications, makes evidence of a dimensionless group "Q/σT" that separates the weight of the irreversibilities and gives the way to an optimization criterion applied to the absorber in order to improve the whole system efficiency. Both thermodynamic equilibrium and sub-cooling conditions of the solution at the inlet are considered for typical temperature and concentration of refrigerators' absorbers and heat transformers' absorbers. Results suggest the importance to work at reduced mass flow-rates with a thin uniform film. In practice, tension-active additives are required to realize this condition. Also, it is highlighted that the two parameters defined with reference to the dimensionless group "Q/σT" can be maximized by specific values of the tube radius, operative Reynolds number, solution sub-cooling and temperature difference between the wall and the inlet solution.

Wetting behavior of a liquid film on an internally-cooled desiccant contactor

Giannetti, Niccolo;Yamaguchi, Seiichi;Saito, Kiyoshi

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 101p.958 - 9692016-2016

DOIWoS

Detail

ISSN:0017-9310

Solar-assisted single-double-effect absorption chiller for use in Asian tropical climates

Lubis, Arnas;Jeong, Jongsoo;Saito, Kiyoshi;Giannetti, Niccolo;Yabase, Hajime;Alhamid, Muhammad Idrus;Nasruddin

RENEWABLE ENERGY 99p.825 - 8352016-2016

DOIWoS

Detail

ISSN:0960-1481

Study on Control of Desiccant Air-Conditioning System for Low-Humidity Environment : Part1-Basic Characteristics of Controlled System

ITO Suguru;OMAGARI Yasuhito;YAMAGUCHI Seiichi;SAITO Kiyoshi

(224) p.9 - 172015/11-2015/11

CiNii

Detail

ISSN:0385275X

Outline:The purpose of this study is to develop a supply air dew point temperature control of a desiccant air-conditioning system for low-humidity environments. To develop the control, we need to know the basic characteristics of the desiccant air conditioning system, which is a controlled system. In this paper, we construct a mathematical model and analyze systematically the basic characteristics of the controlled system. Specifically, we investigate the static and dynamic characteristics of the controlled system with respect to manipulated variables such as desiccant-wheel rotary speed and regeneration outside air flow rate. For static characteristics, we investigate the relation between controlled and manipulated variables and examine the influence of manipulated variables on controlled variables. For dynamic characteristics, we investigate the step response of controlled variables and examine the responsivity or overshoot of controlled variables.

Evaluate VRF Compression Heat-pump System under Steady-State Analysis:-1st Report: Analysis of Numerical Simulation and Experimental Study Focusing on Changing the Number of Active Indoor Units-

MATSUMOTO Kuniyasu;OHNO Keisuke;SAITO Kiyoshi;KISHIMOTO Tetsuro

Transactions of the Japan Society of Refrigerating and Air Conditioning Engineers 32(2) p.95 - 1072015-2015

CiNii

Detail

ISSN:1344-4905

Outline:Recently at commercial buildings and office buildings it is popular to install variable refrigerant flow compression type heat pump system. Those systems have many merits for users and constructors. At first, Cooling capacity's range are wide for choosing adequate capacity, secondly the facilities were downsizing and separable to small units for easy transportation, thirdly multi indoor units can be controlled independently and so on. On the other hand, because driving conditions are changing dynamic for meeting user's needs, it is complicated to adequate driving conditions to save energy consumption. We constructed simulation model by mathematical methods and we tested VRF compression heat-pump system at test room which can adjust temperature conditions freely. We evaluated the system changing the number of active indoor units on partial lord and we showed the effect of COP on this conditions.

Wetting behavior of a liquid film on an internally-cooled desiccant contactor

Giannetti, Niccolò; Yamaguchi, Seiichi; Saito, Kiyoshi

International Journal of Heat and Mass Transfer 101p.958 - 9692016/10-2016/10

DOIScopus

Detail

ISSN:00179310

Outline:© 2016 Elsevier Ltd. All rights reserved.Heat and mass transfer processes performed by using thin liquid films are recurrent in a series of technical applications. The circumstances under which dry spots appear on the exchange surface for the film breakage, as well as the extent of the wetted part of the surface and the liquid-vapor interface, are critical to predict and control the performances of these devices. To characterize the wetting behavior of liquid films on internally-cooled desiccant contactors, this paper originates from an experimental study and, adopting a standpoint useful for a practical interpretation of wettability measurements, introduces a corresponding theoretical model based on the principle of minimum energy. Both the estimation of the wetted area by image processing of the test section and the theoretical model highlight a hysteresis phenomenon of the film wetting behavior for gradually increasing and decreasing liquid flowrates. The modeling approach, experimental results and a first comparison are hereby presented and discussed. Quantitative and qualitative agreement appears promising for a further employment of the model in actual system design and control.

Solar-assisted single-double-effect absorption chiller for use in Asian tropical climates

Lubis, Arnas; Jeong, Jongsoo; Saito, Kiyoshi; Giannetti, Niccolo; Yabase, Hajime; Idrus Alhamid, Muhammad; Nasruddin,

Renewable Energy 99p.825 - 8352016/12-2016/12

DOIScopus

Detail

ISSN:09601481

Outline:© 2016 Elsevier LtdSolar energy is accessible throughout the year in tropical regions. The latest development of absorption chillers has demonstrated that these systems are suitable for effective use of solar energy. The utilisation of solar energy for heat-driven cooling systems has significant advantages. Without a doubt, solar energy represents a clean energy source that is available without any additional fuel cost, and that can be proportionally accessible when the cooling load increases during the middle hours of the day. This study focuses on a single-double-effect absorption chiller machine that was installed in Indonesia. The system is driven by a dual-heat source that combines gas and solar energy. This system is characterised by simulating its performance in various conditions in terms of the cooling water (28–34 °C) and the hot water (75–90 °C) inlet temperatures. The reference operating condition of this system is 239 kW of cooling capacity. The mathematical model is validated and shows a good agreement with experimental data. In the operative range considered, simulation results yield a coefficient of performance between 1.4 and 3.3, and a gas reduction ratio from 7 to 58% when compared to a double-effect absorption chiller driven by gas. Based on the simulation results, this system is expected to have a good potential for widespread use in tropical Asia regions.

Experimental study on heat and mass transfer performance of a falling film absorber

Takigiri, Motohiro; Hatada, Shouta; Yamaguchi, Seiichi; Saito, Kiyoshi; Ikumi, Yonezou

ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning 2016/01-2016/01

Scopus

Detail

Outline:The objective of this study is to evaluate the performance of a falling film absorber for absorption refrigeration machines. Experiments with smooth and enhanced tubes were conducted to measure the heat transfer coefficient of this component in a wide range of mass flow rates, at temperature levels corresponding to an absorption chiller application case. The aim of this study is to experimentally clarify the absorption phenomenon of smooth and enhanced tubes in a wide range of mass flow rates, which would then be useful in designing absorption systems. Regarding the working medium, LiBr-H2O solution was used as the absorbent and water as the refrigerant. Additionally, 1-ocatanol was added as a surfactant. The experimental apparatus consists of 10 horizontal tubes, a distributer, and a desorber. A falling film absorber is that absorption falls from the distributer to the horizontal tubes, which are surrounded by water vapor. The flowing behavior of the absorptive solution on horizontal tubes influences heat and mass transfer coefficient. The mass flow rate and shape of the tube has influence on the flowing behavior. Hence, the experiment was conducted in a wide range of mass flow rate and using different tubes with smooth or enhanced surfaces. The heat transfer coefficient was calculated from the heat transfer rate. As a result, the differences in the heat transfer performance of the absorber for each kind of tube were clarified. It was concluded that the shape of the tube significantly influences the heat transfer coefficient.

Heat and mass transfer characteristics of a dehumidifier using an ionic liquid for a liquid desiccant system

Usuzaka, Tadashi; Kobayashi, Yuto; Yamaguchi, Seiichi; Saito, Kiyoshi; Nakayama, Hiroshi; Miyaoka, Youichi; Wang, Xinming

ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning 2016/01-2016/01

Scopus

Detail

Outline:We studied an air-liquid contactor that uses an ionic liquid as the absorptive solution, in the context of employing liquid desiccant systems for air humidity control. Most liquid desiccant systems use a packed column air-liquid contactor with lithium chloride as the absorptive solution. One of the advantages of using ionic liquids is that some of them are not corrosive towards aluminum or copper. Provided that an air-liquid contactor with ionic liquid can achieve the same or higher performance than a packed column air-liquid contactor, this component can be constructed from metal which allows it to be redesigned to improve the system performance. Therefore, the ultimate purpose of this study is to evaluate the potential of an aluminum-fabricated air-liquid contactor which uses an ionic liquid as the working fluid, and to design a system that can both dehumidify and regenerate the absorptive solution more effectively. In addition, the associated heat, mass and momentum transfer phenomena, were studied to clarify the performance of the air-liquid contactor. An experimental air-liquid contactor apparatus using an ionic liquid was used to measure temperature, concentration, mass flow rate, pressure, and humidity. By adjusting temperature, humidity, and air flow velocity, it was found that the air-liquid contactor using an ionic liquid showed comparable dehumidification performance as the lithium chloride system. This suggests the feasibility of an air-liquid contactor made of metal; such a contactor can be redesigned to further improve its performance.

Performance of solar air-conditioning system using absorption chiller

Yabase, Hajime; Hirai, Akira; Saito, Kiyoshi; Lubis, Arnas; Alhamid, M. Idrus; Nasruddin, N.

ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning 2016/01-2016/01

Scopus

Detail

Outline:Absorption chillers use thermal energy as driving source, and have a feature of being capable of saving electricity. Meanwhile, the global warming issue has worsened markedly in recent years, which causes us to be confronted with the urgent task of realization of low-carbon society. Absorption chillers are also strongly required saving-energy. Under these situations, we have developed a single-double effect combined absorption chiller for the solar cooling system. It enables low temperature solar hot water at 75degreeC under the cooling operation or even lower temperature hot water depending on loading conditions and cooling water conditions. And we constructed the demonstration plant of this system at University of Indonesia. We report the outline and the performance of the chillers and demonstration plant in Indonesia.

Analytical description of falling film absorption

Giannetti, Niccolo; Rocchetti, Andrea; Saito, Kiyoshi; Yamaguchi, Seiichi

ACRA 2016 - 8th Asian Conference on Refrigeration and Air-Conditioning 2016/01-2016/01

Scopus

Detail

Outline:Absorption represents an opportunity towards clean and efficient energy conversion systems. However, the attempt to characterize heat and mass-transfer performance of this process is still incomplete. The attainment of numerical solutions and empirical correlations can be a time-consuming procedure. Also, their information content is limited to the specific operative circumstances fixed each time as boundary or experimental conditions. Furthermore, the increased complexity of absorption devices makes detailed calculation very difficult or impossible and the physical content obscure. Under this point of view, properly simplified analytical models have obvious advantages. An analytical model for horizontal tube falling film absorbers and a detailed investigation of heat and mass transfer performance are hereby presented. Moreover, by means of the inclusion of a partial wetting model at reduced solution mass flowrates, the characterization of falling film absorbers can be extended to a wider range of operative conditions. The paper performs a parametric analysis of the model in order to study exhaustively the dependence of the solution on geometrical and operative parameters for actual applications' design and control. Different correlated phenomena have been described pointing out how to maximize heat and mass transfer performances of the system.

Transient operation characteristics and control method in combined air-conditioning systems

Jeong, Jongsoo; Saito, Kiyoshi; Karng, Sarngwoo; Kim, Seoyoung; Kim, Kwangho

Science and Technology for the Built Environment 23(4) p.567 - 5812017/05-2017/05

DOIScopus

Detail

ISSN:23744731

Outline:Copyright © 2017 ASHRAE. This study examines, using actual driving and simulations, transient operation characteristics and control methods for a combined system. It consists of both single-stage compression-type and single-effect absorption-type refrigerators and is driven by the shaft power and waste heat from a gas engine. Given the complicated nature of the system, determining the unsteady-state performance and control characteristics of the entire system is difficult. Hence, it must be equipped with an adequate control system to maintain acceptable system performance. Our results reveal that this system is controlled, as predicted, under unsteady-state conditions by using a novel control method. The unsteady-state simulation model is validated by comparing the driving results with the simulated results. Thus, gas-engine-driven combined air-conditioning systems possess a response time similar to absorption-type refrigerators. This indicates that the transient response of the entire system is governed by the absorption-type refrigerator, although the cooling capacity of the absorption-type refrigerator is only 13% of the entire cooling capacity. Therefore, when designing the control system of the combined system, the fact that the entire combined system is mainly governed by the absorption-type refrigerator should be considered despite its low cooling capacity.

Analytical solution of film mass-transfer on a partially wetted absorber tube

Giannetti, Niccolò; Rocchetti, Andrea; Yamaguchi, Seiichi; Saito, Kiyoshi

International Journal of Thermal Sciences 118p.176 - 1862017/08-2017/08

DOIScopus

Detail

ISSN:12900729

Outline:© 2017 Elsevier Masson SAS This work presents a two-dimensional analytical solution of the governing differential equation for falling film vapour-absorption around a plain horizontal tube. The solution of the species transport equation gives the LiBr mass fraction distribution within the liquid absorptive film flowing along the tube surface and can be used to characterize the mass transfer performance of falling film absorbers or generators. By means of the inclusion of partial wetting effects at reduced solution mass flowrates, this study obtains an analytical expression of the mass transfer coefficient of these devices applicable over an extended range of operative conditions. The hypotheses of small penetration for physical absorption and constant heat flux condition are applied at the film interface to reach a closed-form solution. Fourier method is used to solve the problem and the eigenvalues obtained from the characteristic equation depend on Lewis number, Biot number and the dimensionless heat of absorption. Given the boundary condition at the wall, the two-dimensional mass fraction field of the laminar film can be expressed analytically as a function of Schmidt, Reynolds numbers, the tube dimensionless diameter and the ratio of the wetted area to the total exchange surface. Finally, mass transfer coefficient and absorbed mass flux are locally and globally investigated as functions of the influent dimensionless groups to clarify their effects on the physical process and screen the potentiality of the model. Results show notable qualitative and quantitative agreement with previous numerical solutions and experimental results from previous literature. This model constitutes a widely applicable and time-saving tool for actual system simulations, design and control.

Pressure-Volume-Temperature Property Measurements for trans-1,1,1,3-Tetrafluoro-2-butene [HFO-1354mzy(E)]

Kimura, Takeru; Kayukawa, Yohei; Saito, Kiyoshi

Journal of Chemical and Engineering Data 62(4) p.1422 - 14262017/04-2017/04

DOIScopus

Detail

ISSN:00219568

Outline:© 2017 American Chemical Society. This study presents experimental measurements of the vapor pressures and pressure-volume-temperature (PVT) properties of trans-1,1,1,3-tetrafluoro-2-butene, also known as HFO-1354mzy(E). This substance is expected to be a candidate working fluid for high-temperature heat pumps. The densities were measured by magnetic levitation densimeter (MLD). Vapor pressures were measured over the temperature range from (340 to 410) K, at pressures from (0.5 to 2.5) MPa. Liquid-phase PVT properties were measured at temperatures between (280 and 420) K at pressures up to 20 MPa. Gas-phase PVT properties were measured in the temperature range from (340 to 420) K at pressures from (0.5 to 2.5) MPa. The experimental uncertainties of the present measurements were estimated to be within ±18 mK in temperature, ±2.9 kPa in pressure, and ±0.012 % in density, respectively. The vapor pressure correlation and equations of state (EoS) for the liquid-phase and gas-phase PVT properties were derived. The vapor pressure correlation and the proposed EoS were found to well represent the set of measurements within a deviation of ±0.13 % in vapor pressure, ±0.2 % in liquid phase density, and ±0.3 % in pressure for the gas-phase PVT properties, respectively.

Experimental performance of a double-lift absorption heat transformer for manufacturing-process steam generation

Lubis, Arnas; Giannetti, Niccolo; Yamaguchi, Seiichi; Saito, Kiyoshi; Inoue, Naoyuki

Energy Conversion and Management 148p.267 - 2782017/09-2017/09

DOIScopus

Detail

ISSN:01968904

Outline:© 2017 Elsevier Ltd As widely known, some industrial processes produce a large amount of waste heat while others require a large amount of steam to heat the process flow. The main difference involves the temperature level of these heat quantities. Absorption heat transformers play a strategic role in waste heat recovery and heat supply to manufacturing processes due to their ability to utilize heat at a certain temperature level and release the enthalpy of mixing of the refrigerant at a different temperature level with a negligible amount of mechanical work input. However, given the lack of examples that find application as operative plants, the feasibility of the technology is questioned in academic and technical domains. In this study, the operability of a double-lift absorption heat transformer that generates pressurized steam at 170 °C is studied across a full range of operative conditions. The results demonstrate and clarify the manner in which the system can operate steadily and efficiently when driven by hot water temperature at approximately 80 °C while safely generating steam at a temperature exceeding 170 °C. The conditions yielding maximum system efficiency and capacity are identified, and the obtained experimental results are used to define an optimal control strategy.

Critical Parameters and Critical-Region (p, ρ, T) Data of trans-1,1,1,3-Tetrafluorobut-2-ene [HFO-1354mzy(E)]

Kimura, Takeru; Kayukawa, Yohei; Miyamoto, Hiroyuki; Saito, Kiyoshi

International Journal of Thermophysics 38(8) 2017/08-2017/08

DOIScopus

Detail

ISSN:0195928X

Outline:© 2017, Springer Science+Business Media New York. This study presents the experimental measurement of the pρT properties and critical parameters of a low GWP type refrigerant, trans-1,1,1,3-Tetrafluorobut-2-ene (HFO-1354mzy(E)). The sample purity of the substance was 99 area %. pρT property measurements and visual observations of the meniscus of HFO-1354mzy(E) were carried out using a metal-bellows volumometer with an optical cell. The critical temperature was determined by observation of the critical opalescence. The critical pressure and critical density were determined as the inflection point of the isothermal pρT property data at the critical temperature. For more precise clarification of the thermodynamic surface in the vicinity of the critical point, additional pρT property measurements were carried out on three isotherms in the supercritical region. The expanded uncertainties (k= 2) in the temperature, pressure, and density measurements were estimated to be less than 3 mK, 1.2 kPa, and 0.32 kg · m - 3 , respectively. The expanded uncertainties of the critical parameters were estimated to be less than 13 mK, 1.4 kPa, and 2.3 kg · m - 3 , respectively. These values are the first reported for HFO-1354mzy(E) and are necessary for the development of its equation of state in the near future.

Cascade refrigeration system with inverse Brayton cycle on the cold side

Giannetti, Niccolò; Milazzo, Adriano; Rocchetti, Andrea; Saito, Kiyoshi

Applied Thermal Engineering 127p.986 - 9952017/12-2017/12

DOIScopus

Detail

ISSN:13594311

Outline:© 2017 Elsevier Ltd Low temperature refrigeration of cold stores poses some specific issues: single stage, vapour compression cycles have modest COP at low evaporation temperature; cold evaporator surfaces require de-frosting and a fan for air circulation; a part of the refrigeration load may be delivered at intermediate temperature levels, e.g. for the cold store loading dock. Cascade system may improve the COP and add flexibility on the temperature levels and working fluids, but the problems related to the cold evaporator surface remain unsolved. The refrigeration system presented herein features a cascade configuration combining a vapour compression cycle and an inverse Brayton cycle. Both cycles use “natural” fluids, complying with strictest regulations. The top cycle uses Ammonia in order to increase efficiency, while the bottom cycle uses air, which directly circulates in the cold space and hence eliminates the cold heat exchanger. A detailed thermodynamic analysis allows a complete screening of the relevant design parameters for an overall system optimization. The results show that, notwithstanding the intrinsic gap of efficiency suffered by the Brayton cycle, the proposed system features an acceptable global performance and widens the implementation field of this technology. This system configuration shows a COP 50% higher than the corresponding simple Brayton cycle at temperatures of the refrigerated storage of −50 °C.

Annular flow stability within small-sized channels

Giannetti, Niccolò; Kunita, Daisuke; Yamaguchi, Seiichi; Saito, Kiyoshi

International Journal of Heat and Mass Transfer 116p.1153 - 11622018/01-2018/01

DOIScopus

Detail

ISSN:00179310

Outline:© 2017 Elsevier Ltd An analytical study based on a variational thermodynamic principle is presented to evaluate the influence of surface tension on the stability of annular flow within small-sized channels. The model introduces phenomenological assumptions in the interfacial structure of the flow regime and theoretically draws the equilibrium transition line from an annular regime to the initiation of the partial wetting condition on the inner surface. By including surface tension, this model expands previous theories and identifies the stable flow configuration in terms of void fraction and interfacial extension. The significant influence of a higher surface tension and smaller diameter (i.e. lower Weber number) are responsible for a lower stable void fraction and higher slip ratio. A complete screening of the main influential parameters is conducted to explore the descriptive ability of the model. This analysis aims at contributing to the understanding of the stability of two-phase flow regimes and can be extended to the transition between other neighbouring regimes, including wall friction as well as liquid entrainment phenomena.

Effect of liquid reynolds number on pressure drop of evaporative R-290 in 500μm circular tube

Novianto, Sentot; Pamitran, Agus S.; Koestoer, Raldi; Oh, Jong Taek; Saito, Kiyoshi

International Journal of Technology 8(5) p.851 - 8572017/10-2017/10

DOIScopus

Detail

ISSN:20869614

Outline:© IJTech 2017. Due to certain advantages, natural refrigerants have recently become more popular. Environmental issues motivate this study, focused on the characteristics of propane (R-290) as a replacement for conventional refrigerants. The aim of the present research is to characterize the pressure drop of evaporative R-290 in a microchannel of 500μm diameter and 0.5 m length. The variables of the experimental conditions are mass flux between 155 and 1071 kg/m 2 s and vapor quality between 0 and unity. The results show a laminar flow for liquid R-290 and a turbulence flow for vapor. Some existing correlations of two-phase flow viscosity were used to predict the pressure drop. For homogeneous model, Dukler et al.'s (1964) prediction viscosity correlation best predicted the present experimental pressure drop.

Start-up behaviour of a combined air-conditioning system in cooling and heating operating modes

Jeong, Jongsoo; Lubis, Arnas; Saito, Kiyoshi; Karng, Sarngwoo; Kim, Seoyoung; Kim, Kwangho

Energy and Buildings 158p.1346 - 13572018/01-2018/01

DOIScopus

Detail

ISSN:03787788

Outline:© 2017 Elsevier B.V. The energy demand of the commercial building sector is largely for cooling and heating and will eventually result in energy and environmental crises; therefore, enhancing the performance of the cooling and heating systems used in buildings is paramount. In response to this need, focus was set on the gas engine-driven heat pump-combined system (GHPC)—consisting of a gas engine, single-stage vapour compression system, and single-effect absorption system— that saves more energy as compared to a conventional gas engine-driven heat pump. However, so far, only the performance and transient characteristics of a fabricated GHPC have been investigated. Therefore, to ascertain the characteristics of the GHPC start-up dynamics under unsteady state operations so as to achieve efficient and stable start-up operation, experiments and simulations were attempted in this study. The transient behaviour from the start-up of this combined system in cooling and heating operating modes was also scrutinized. Accordingly, it was found that simulation results agreed well with experimental data. It was concluded that there were no large delayed responses in the absorption system during start-up operation when start-up of the absorption system is considered based on the system cooling capacity response after the solution pump starts.

Heat and mass transfer coefficients of falling-film absorption on a partially wetted horizontal tube

Giannetti, Niccolò; Rocchetti, Andrea; Yamaguchi, Seiichi; Saito, Kiyoshi

International Journal of Thermal Sciences 126p.56 - 662018/04-2018/04

DOIScopus

Detail

ISSN:12900729

Outline:© 2017 Elsevier Masson SAS Detailed, reliable, and time-saving methods to predict the transfer characteristics of horizontal-tube falling-film absorbers are critical to control system operability, such that it is closer to its technical limitations, and to optimise increasingly complex configurations. In this context, analytical approaches continue to hold their fundamental importance. This study presents an analytical solution of the governing transport equations of film absorption around a partially wetted tube. A film stability criterion and a wettability model extend the validity range of the resulting solution and increase its accuracy. Temperature and mass fraction fields are analytically expressed as functions of Prandtl, Schmidt, and Reynolds numbers as well as tube dimensionless diameter and wetting ratio of the exchange surface. Inlet conditions are arbitrary. The Lewis number and a dimensionless heat of absorption affect the characteristic equation and the corresponding eigenvalues. Consequently, local and average transfer coefficients are estimated and discussed with reference to the main geometrical and operative parameters. Finally, a first comparison with the numerical solution of the problem and experimental data from previous literature is presented to support the simplifying assumptions, which are introduced and as a first model validation.

General correlations for the heat and mass transfer coefficients in an air-solution contactor of a liquid desiccant system and an experimental case application

Varela, Richard Jayson; Yamaguchi, Seiichi; Giannetti, Niccolo; Saito, Kiyoshi; Harada, Masatoshi; Miyauchi, Hikoo

International Journal of Heat and Mass Transfer 120p.851 - 8602018/05-2018/05

DOIScopus

Detail

ISSN:00179310

Outline:© 2017 Elsevier Ltd This paper presents general types of correlation for the heat and mass transfer coefficients inside an air-solution contactor as expressions of Reynolds-Prandtl numbers and Reynolds-Schmidt numbers, respectively. These general equations summarize the physical and thermophysical properties of the air, the solution, and the contactor, which make them capable to be used for parametric studies provided they are fitted in a wide range of experimental data that include all the properties involved. In this work, a liquid desiccant system with an adiabatic structured packed bed as contactor and an aqueous lithium chloride as solution was constructed. The experimental data taken at various air superficial velocities and solution flow rates were fitted to the general correlations, and comparisons between the predicted and experimental results for both coefficients are within ±10%, for both dehumidification and regeneration processes. In addition, the calculated values of the outlet air humidity ratio and temperature agree well with the experimental data for both processes. The particular equations for the heat and mass transfer coefficients can be used to perform parametric studies at different air superficial velocities and solution flow rates with very good accuracy. Results from this study can help improve the system design and operation methods of air-solution contactors.

Books And Publication

エネルギーの辞典

齋藤潔 他

朝倉書店2009/10-

Patent

Reference Number:186

燃料電池併合ハイブリッド型デシカント空調システム(日本)

河合 素直, 齋藤 潔

2002-247499、2004- 85096

Reference Number:199

ハイブリッド型デシカント空調システム(日本)

河合 素直, 齋藤 潔

2002-080744、2003-279070

Reference Number:363

高温空調システム(日本)

河合 素直, 齋藤 潔

2004- 63609、2005-249359

Reference Number:1277

米飯製造方法及び米飯製造装置(日本)

齋藤 潔, 河合 素直

2012-009321、2013-146224、5938588

Research Grants & Projects

Grant-in-aids for Scientific Research Adoption Situation

Research Classification:

Mathematical model, and optimum design and control of solar driven ejector heat pum

2012/-0-2015/-0

Allocation Class:¥5460000

Research Classification:

Analysis and controlling of a simultaneous heat and mass transfer behavior in a desiccant rotor for expanding adsorptive energy systems

2014/-0-2017/-0

Allocation Class:¥16120000

Research Fund Acceptance Situation

Embodiment:Commissioned education programs

Study on the advanced tubes of absorber for absorption refrigerator2000-2001

Embodiment:Commissioned education programs

Optimum design of latent heat recovery heat exchangers2001-

On-campus Research System

Special Research Project

WMVRハイブリッド吸収冷凍機の最適設計・制御に関する研究

2000

Research Results Outline: 吸収冷凍機はコージェネレーションにおける排熱を駆動熱源として利用することが可能なことから、省エネルギーを実現できる有効な冷凍、空調機器である。排熱駆 吸収冷凍機はコージェネレーションにおける排熱を駆動熱源として利用することが可能なことから、省エネルギーを実現できる有効な冷凍、空調機器である。排熱駆動吸収冷凍機により排熱の利用が進めば、一次エネルギーの消費に伴うCO2の排出量を削減することが可能... 吸収冷凍機はコージェネレーションにおける排熱を駆動熱源として利用することが可能なことから、省エネルギーを実現できる有効な冷凍、空調機器である。排熱駆動吸収冷凍機により排熱の利用が進めば、一次エネルギーの消費に伴うCO2の排出量を削減することが可能となり、地球環境保護に対して極めて有効ということができる。ところが吸収冷凍機の駆動源として排熱だけを使用すると、冷房負荷が減少した場合には余剰な排熱が生じたり、排熱量が不足した場合には所定の冷房負荷を満足することができなくなる。このような場合には、全冷房負荷を排熱駆動の冷凍機だけで担うことなく、安定した駆動源で駆動される冷凍機でバックアップしていくことが有効となる。 そこで、本研究では、圧縮式サイクル(MVRサイクル)と排熱駆動の単効用吸収サイクルを複合することにより一台の冷凍機で排熱と動力を同時に用いて駆動可能なハイブリッド吸収冷凍機を新たに提案する。本冷凍機により排熱の変動に対して動力あるいは電力という安定した駆動源でのバックアップ運転が可能となる。このハイブリッド吸収冷凍機を採用すれば、ガスエンジンヒートポンプの大幅な効率向上、太陽エネルギーあるいはプロセス工場などで発生する排熱の有効利用による省エネルギーを実現することが可能となる。 本冷凍機を対象に、詳細な特性解析を行い、設計に関する指針を得ることを目的として検討を進めた結果、次のような結論を得た。 (1)一般的な吸収冷凍機の入力条件で、本冷凍機を設計した結果、排熱側サイクルのCOPはおよそ0.75、MVR側サイクルのCOPはおよそ4.92と極めて高い効率が得られることがわかった。 (2)MVR再生器内の圧力について検討を行った結果、MVR再生器内の圧力は、圧縮機の容積と吸収溶液の腐食性を考慮すると最適な圧力が存在することがわかった。 (3)濃度幅の増加により、動作点におけるMVR側、排熱側サイクルそれぞれのCOPは向上するが、MVR再生器出口の吸収溶液の温度が上昇するため腐食の問題を考慮することが必要となることがわかった。

エゼクター式吸収器によるハイブリッド吸収ヒートポンプの高効率化に関する研究

2002

Research Results Outline: エゼクターは,動作流体の膨張過程において不可逆損失として熱エネルギーに変換されてしまう力学的エネルギーを回収することができる.このため,吸収式冷凍機 エゼクターは,動作流体の膨張過程において不可逆損失として熱エネルギーに変換されてしまう力学的エネルギーを回収することができる.このため,吸収式冷凍機に用いられているいくつかの膨張弁のかわりにエゼクターを採用し,この力学的エネルギーを吸収器内圧力の... エゼクターは,動作流体の膨張過程において不可逆損失として熱エネルギーに変換されてしまう力学的エネルギーを回収することができる.このため,吸収式冷凍機に用いられているいくつかの膨張弁のかわりにエゼクターを採用し,この力学的エネルギーを吸収器内圧力の上昇に用いることで冷凍機の大幅な効率向上が可能である. そこで,本研究では,シミュレーションによりエゼクターの特性解析ならびにエゼクターを吸収冷凍機に組み入れた場合の性能を評価することを目的とする. まず,エゼクターならびに吸収式冷凍機のシミュレーションモデルを構築した.ここでは,エゼクターを駆動流ノズル,吸引流ノズル,混合部,ディフューザーからなるシステムと見なし,それぞれの要素を連続方程式,エネルギー方程式,断熱効率からなる数式モデルで表す.そして,それぞれのモデルを接続することによりエゼクター全体のモデルを構築した.同様の手法で,吸収式冷凍機全体のモデルも構築した. その結果,まず,エゼクターの特性として排出流の排圧が最大となる最適な混合部入口圧力が存在することが明らかとなった.この点では,エゼクター内でのエントロピー生成が最小となる. また,水-アンモニアを作動媒体とする吸収式冷凍機において冷凍機の蒸発温度が-10℃の場合には約15%もの性能向上が見込めることがわかった.

三重効用吸収冷凍機のモデル化と最適設計に関する研究

2004

Research Results Outline: 近年,地球環境保全や省エネルギー化の観点から吸収冷凍機の大幅な高効率化を実現する三重効用吸収サイクルの研究が進められている.しかし,三重効用吸収冷凍 近年,地球環境保全や省エネルギー化の観点から吸収冷凍機の大幅な高効率化を実現する三重効用吸収サイクルの研究が進められている.しかし,三重効用吸収冷凍機の開発には,様々な技術的課題が残されている.特に高温の臭化リチウム溶液による高温再生器缶胴の腐食... 近年,地球環境保全や省エネルギー化の観点から吸収冷凍機の大幅な高効率化を実現する三重効用吸収サイクルの研究が進められている.しかし,三重効用吸収冷凍機の開発には,様々な技術的課題が残されている.特に高温の臭化リチウム溶液による高温再生器缶胴の腐食,高温再生器内の高圧化が大きな問題とされており,未だ実用化にはいたっていない. そこで,本研究ではシミュレーションにより,三重効用吸収冷凍機の特性を評価することにより,高温再生器内の低温,低圧化を可能とする設計指針を得ることを目的とする.具体的には,三重効用吸収サイクルの3つの代表的なサイクルであるシリーズ,リバース,パラレルを対象に,(1)蒸発器・吸収器をそれぞれ2基とした2段吸収の効果(2)冷却水経路を通常の実機とは逆に凝縮器→吸収器とした効果(3)パラレルフローにおける吸収溶液分配比を含むサイクルの最適化の効果について検討を行う. 三重効用吸収サイクルの最適化計算には,試行錯誤法と外点ペナルティ法を採用する.外点ペナルティ法は,制約条件付き最小化問題を無制約最小化問題に変換し,最適点を導出する手法である. 解析の結果,次のことが明らかとなった.(1)蒸発器・吸収器を2段とし,冷却水経路を従来とは逆に凝縮器から吸収器へと流動させることにより,COPを0.2以上向上させ,高温再生器溶液出口温度を約30℃低下させ,高温再生器内圧力をシリーズ,リバースフローでは約200kPa,パラレルフローでは約100kPa低減させることができる.(2)高温再生器出口温度に限界温度を設定し,その範囲で,パラレルフローの溶液分配比を含めたそれぞれのフローの最適点での性能比較を行った結果,パラレルフローは,COPが最も高く,高温再生器圧力も最も低くできる.

汎用熱システム解析手法による湿式除湿機の動特性の究明と最適設計・制御手法の確立

2007

Research Results Outline: 近年,次世代の除湿装置としてリキッドデシカントシステムが注目されている.リキッドデシカントシステムは,低温排熱による駆動が可能なこと,結露を伴わず衛 近年,次世代の除湿装置としてリキッドデシカントシステムが注目されている.リキッドデシカントシステムは,低温排熱による駆動が可能なこと,結露を伴わず衛生的であること,吸収液による空気の除菌や消臭が可能なことなどの特徴がある. これまでに,実機による... 近年,次世代の除湿装置としてリキッドデシカントシステムが注目されている.リキッドデシカントシステムは,低温排熱による駆動が可能なこと,結露を伴わず衛生的であること,吸収液による空気の除菌や消臭が可能なことなどの特徴がある. これまでに,実機による性能評価試験や,シミュレーションにより,リキッドデシカントシステムの有用性を示してきた.しかし,本システムの設計・制御手法などについては,いまだ確立されていないのが現状である.特に,システムの主要要素である吸収・再生器充填層における熱・物質移動特性は,不明な点が多く,その設計指針が得られているとは言えない. そこで,この吸収・再生器用充填層の要素試験を行い,その圧力損失や熱・物質移動特性について明らかにする.具体的には,乾燥時の圧力損失を実験とCFDによるシミュレーションの双方から評価する.さらに,熱・物質移動特性として,空気面速や溶液質量流束などが熱・物質通過率に与える影響について調査する.  その結果,今回対象とする充填層の乾燥時の圧力損失を測定したところ,レイノルズ数が200付近で層流から乱流に遷移することが分かった.また,このときのレイノルズ数と損失係数の関係を整理式としてまとめることができた. また,溶液質量流束および空気面速度が充填層出口の空気お温度・湿度に与える影響を実験的に明らかにできた.また,溶液質量流束が小さい領域で,空気が吸収熱により加熱されて排出されうることを確認した.さらに,物質通過率・熱通過率で整理したところ,溶液質量流束の増加に対しては物質通過率・熱通過率ともに上昇していくが,空気面風速の影響については明確な依存関係は見いだせなかった.

エネルギーシステムの統一的解析理論の確立とヒートポンプサイクルの大域的非定常解析

2010

Research Results Outline:ヒートポンプをはじめとしたエネルギーシステムにおいては,規格で評価された性能と実運転状況下で評価された性能に大きな乖離があることが指摘されている.このヒートポンプをはじめとしたエネルギーシステムにおいては,規格で評価された性能と実運転状況下で評価された性能に大きな乖離があることが指摘されている.このため,機器の真の性能向上を実現するためには,常に制御により非定常な状態で運転される機器の非定常実運...ヒートポンプをはじめとしたエネルギーシステムにおいては,規格で評価された性能と実運転状況下で評価された性能に大きな乖離があることが指摘されている.このため,機器の真の性能向上を実現するためには,常に制御により非定常な状態で運転される機器の非定常実運転性能を詳細に把握し,高効率化を実現することが必要である.このような検討には,非定常シミュレーションが必要不可欠である.そこで,エネルギーシステムの中でも二相流の分岐・混合,チョークが発生するだけでなく,断続運転のような大振幅非線形非定常現象が発生するため解析が困難となるヒートポンプシステムを対象としてその非定常解析を実施する.同時にこのような最難関の非定常解析を通じて,申請者が15年にわたり,研究を実施してきたエネルギーシステムの統一的解析理論を非定常現象への拡張することを目的とする.これまでに,定常解析については,すでに本解析理論の構築をほぼ終え,多様なエネルギーシステムの解析を可能とし,単に論文発表だけでなく,受託研究を通じて実際にその成果を上げている.しかし,エネルギーシステムの非定常解析についてもすでに複数の研究を受託し,様々な成果を残してきたが,これらはすべて簡易な非定常解析モデルを採用した結果である.このため,ヒートポンプシステム,発電システム等のエネルギーシステムの中でしばしば見られる二相流の分岐・混合現象,高速二相流のチョーク等の現象に対してどのように一般性のある解析を実現するか,また非線形解析の収束性を改善し,どのように計算の安定性を改善するか等クリアーすべき課題が複数残されているのが現状である.そこで,本研究では,エネルギーシステムの非定常解析を実現する上で十分に検討がなされていない二相流の分岐・混合現象,高速2相流現象が含まれるとともに,断続運転,起動,停止運転等の大振幅非線形非定常現象を含むヒートポンプを対象とし,その大域的非定常解析を可能とする.また,ヒートポンプの高度な非定常解析を通じてエネルギーシステムの統一的理論を非定常解析にまで拡張することが目的となる.本研究の結果,大振幅非線形非定常問題となるヒートポンプの断続運転,起動・停止運転の合理的解析手法を明確とすることができた.また,システムの制御特性に大きな影響を及ぼす断続運転の周期,振幅等がシステムの性能にどのような影響を与えるかも詳細に明らかにすることができた.また,上記ヒートポンプの解析を実現しながら,ヒートポンプだけでなく,多様なエネルギーシステムの合理的解析を実現するための手法をさらに強化することができた.

第二種吸収式ヒートポンプ用高温吸収器の流動, 伝熱特性評価

2014

Research Results Outline:本研究は,第二種吸収式ヒートポンプの吸収器の伝熱性能を実験と解析により明らかにしようとするものである.従来の吸収器は,冷凍サイクルとして用いられたため本研究は,第二種吸収式ヒートポンプの吸収器の伝熱性能を実験と解析により明らかにしようとするものである.従来の吸収器は,冷凍サイクルとして用いられたため,吸収溶液は40~50℃程度で伝熱管外表面を流動していた.これに対して第二種吸収ヒートポンプでは,...本研究は,第二種吸収式ヒートポンプの吸収器の伝熱性能を実験と解析により明らかにしようとするものである.従来の吸収器は,冷凍サイクルとして用いられたため,吸収溶液は40~50℃程度で伝熱管外表面を流動していた.これに対して第二種吸収ヒートポンプでは,150℃程度の吸収溶液が伝熱管外表面を流動するため,伝熱特性が大きく変わり,機器の過剰設計や性能不足といった問題を引き起こす. そこで,吸収器の要素試験により,溶液流量を1~6kg/min,溶液温度を60℃から160℃まで,広範囲に変化させて熱伝達率を測定した.また,この実験結果から,Nu数が0.03~1.0程度までの広範囲に吸収器の伝熱性能を予測可能な伝熱評価式を構築することができた. 

Foreign Countries Research Activity

Research Project Title: 熱システムにおける汎用的解析手法ならびに新要素技術の確立

2005/06-2006/05

Affiliation: Univ. of Illinois(アメリカ)

Lecture Course

Course TitleSchoolYearTerm
Basic Experiments in Science and Engineering 2A Kikai KoukuSchool of Fundamental Science and Engineering2020spring semester
Applied Mechanics and Aerospace TechnologySchool of Fundamental Science and Engineering2020spring semester
Applied Mechanics and Aerospace Technology [S Grade]School of Fundamental Science and Engineering2020spring semester
Design and Analysis of Engineering SystemsSchool of Fundamental Science and Engineering2020spring semester
Design and Analysis of Engineering Systems [S Grade]School of Fundamental Science and Engineering2020spring semester
Thermodynamics 1School of Fundamental Science and Engineering2020spring semester
Thermodynamics 1 [S Grade]School of Fundamental Science and Engineering2020spring semester
Control EngineeringSchool of Fundamental Science and Engineering2020fall semester
Control Engineering [S Grade]School of Fundamental Science and Engineering2020fall semester
Thermodynamics 2School of Fundamental Science and Engineering2020fall semester
Thermodynamics 2 [S Grade]School of Fundamental Science and Engineering2020fall semester
Mechanical and Aerospace Engineering Laboratory 1School of Fundamental Science and Engineering2020spring semester
Mechanical and Aerospace Engineering Laboratory 1 [S Grade]School of Fundamental Science and Engineering2020spring semester
Mechanical and Aerospace Engineering Laboratory 2School of Fundamental Science and Engineering2020fall semester
Mechanical and Aerospace Engineering Laboratory 2 [S Grade]School of Fundamental Science and Engineering2020fall semester
SeminarSchool of Fundamental Science and Engineering2020full year
Seminar [S Grade]School of Fundamental Science and Engineering2020full year
Graduation ThesisSchool of Fundamental Science and Engineering2020full year
Graduation Thesis [S Grade]School of Fundamental Science and Engineering2020full year
Heat TransferSchool of Fundamental Science and Engineering2020spring semester
Thermodynamics ASchool of Fundamental Science and Engineering2020fall quarter
Thermodynamics BSchool of Fundamental Science and Engineering2020winter quarter
Applied Mechanics and Aerospace Engineering Laboratory ASchool of Fundamental Science and Engineering2020spring quarter
Applied Mechanics and Aerospace Engineering Laboratory BSchool of Fundamental Science and Engineering2020summer quarter
Control Engineering ASchool of Fundamental Science and Engineering2020fall quarter
Control Engineering BSchool of Fundamental Science and Engineering2020winter quarter
Dynamics ASchool of Fundamental Science and Engineering2020spring quarter
Dynamics BSchool of Fundamental Science and Engineering2020summer quarter
Heat TransferGraduate School of Fundamental Science and Engineering2020spring semester
Heat TransferGraduate School of Creative Science and Engineering2020spring semester
Heat TransferGraduate School of Advanced Science and Engineering2020spring semester
Master's Thesis (Department of Applied Mechanics)Graduate School of Fundamental Science and Engineering2020full year
Research on Dynamics and Control of Mechanical SystemsGraduate School of Fundamental Science and Engineering2020full year
Advanced Dynamics and Control of Mechanical SystemsGraduate School of Fundamental Science and Engineering2020fall semester
Seminar on Dynamics and Control of Mechanical Systems AGraduate School of Fundamental Science and Engineering2020spring semester
Seminar on Dynamics and Control of Mechanical Systems BGraduate School of Fundamental Science and Engineering2020fall semester
Seminar on Dynamics and Control of Mechanical Systems CGraduate School of Fundamental Science and Engineering2020spring semester
Seminar on Dynamics and Control of Mechanical Systems DGraduate School of Fundamental Science and Engineering2020fall semester
Research on Dynamics and Control of Mechanical SystemsGraduate School of Fundamental Science and Engineering2020full year
Seminar on Applied Mechanics AGraduate School of Fundamental Science and Engineering2020spring semester
Seminar on Applied Mechanics BGraduate School of Fundamental Science and Engineering2020fall semester