Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems

Absorption refrigeration technology, which has the ability to utilize heat directly for cooling purposes, has been one of the most widely used technologies for refrigeration and cooling applications since the early stages of refrigeration technology. Working fluid mixtures employed in the absorption...

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Detalles Bibliográficos
Autor: Asfand, Faisal
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2016
País:España
Institución:CBUC, CESCA
Repositorio:TDR. Tesis Doctorales en Red
OAI Identifier:oai:www.tdx.cat:10803/395951
Acceso en línea:http://hdl.handle.net/10803/395951
Access Level:acceso abierto
Palabra clave:Refrigeració per absorció
Transferència de calor i masa
Contactors de membrana
Refrigeración por absorción
Transferencia de calor y masa
Contactores de membrana
Absorption refrigeration
Heat and mass transfer
Membrane contactors
Enginyeria i Arquitectura
536
6
62
621
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spelling Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systemsAsfand, FaisalRefrigeració per absorcióTransferència de calor i masaContactors de membranaRefrigeración por absorciónTransferencia de calor y masaContactores de membranaAbsorption refrigerationHeat and mass transferMembrane contactorsEnginyeria i Arquitectura536662621Absorption refrigeration technology, which has the ability to utilize heat directly for cooling purposes, has been one of the most widely used technologies for refrigeration and cooling applications since the early stages of refrigeration technology. Working fluid mixtures employed in the absorption cooling systems are environmental friendly and do not contribute in green house gas emission when compared to vapour compression systems which also use costly mechanical energy input. However, high initial costs and bigger size are some of the main obstacles that impede their wide use in small scale residential buildings and transport sector. In order to overcome these obstacles, design and configuration of the system and its components need to be reinvestigated in order to achieve compact components and reduce the size of the system. Use of membrane contactors in the form of hollow fiber membrane module or plate-and-frame membrane module is one of the alternatives to achieve compact components. Absorber is an important component of the absorption refrigeration system and plays a critical role in the overall performance, size, and capital cost of the system. In this study, numerical analyses are performed to evaluate the performance of a plate-and-frame membrane contactor based absorber employing water/(LiBr + LiI + LiNO3 + LiCl) and water/(LiNO3+KNO3+NaNO3) working fluid mixtures for air cooled absorption cooling systems and multi-stage high temperature heat sources applications, respectively. CFD tool ANSYS/FLUENT 14.0 is used to perform the simulation and investigate in detail the heat and mass transfer mechanisms and the fluid dynamics behaviour at local levels in the channels. Moreover, a MATLAB code is developed to investigate the effect of membrane material characteristics and operating conditions on the absorption performance of the absorber. This study recommends optimum operating and design parameters to effectively utilize the membrane based absorber.Universitat Rovira i VirgiliBourouis Chebata, MahmoudUniversitat Rovira i Virgili. Departament d'Enginyeria Mecànica201620182016info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersion175 p.application/pdfapplication/pdfhttp://hdl.handle.net/10803/395951TDX (Tesis Doctorals en Xarxa)reponame:TDR. Tesis Doctorales en Redinstname:CBUC, CESCAInglésADVERTIMENT. L'accés als continguts d'aquesta tesi doctoral i la seva utilització ha de respectar els drets de la persona autora. Pot ser utilitzada per a consulta o estudi personal, així com en activitats o materials d'investigació i docència en els termes establerts a l'art. 32 del Text Refós de la Llei de Propietat Intel·lectual (RDL 1/1996). Per altres utilitzacions es requereix l'autorització prèvia i expressa de la persona autora. En qualsevol cas, en la utilització dels seus continguts caldrà indicar de forma clara el nom i cognoms de la persona autora i el títol de la tesi doctoral. No s'autoritza la seva reproducció o altres formes d'explotació efectuades amb finalitats de lucre ni la seva comunicació pública des d'un lloc aliè al servei TDX. Tampoc s'autoritza la presentació del seu contingut en una finestra o marc aliè a TDX (framing). Aquesta reserva de drets afecta tant als continguts de la tesi com als seus resums i índexs.info:eu-repo/semantics/openAccessoai:www.tdx.cat:10803/3959512026-06-14T12:46:07Z
dc.title.none.fl_str_mv Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
title Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
spellingShingle Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
Asfand, Faisal
Refrigeració per absorció
Transferència de calor i masa
Contactors de membrana
Refrigeración por absorción
Transferencia de calor y masa
Contactores de membrana
Absorption refrigeration
Heat and mass transfer
Membrane contactors
Enginyeria i Arquitectura
536
6
62
621
title_short Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
title_full Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
title_fullStr Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
title_full_unstemmed Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
title_sort Analysis of heat and mass transfer in membrane-based absorbers with new working fluid mixtures for absorption cooling systems
dc.creator.none.fl_str_mv Asfand, Faisal
author Asfand, Faisal
author_facet Asfand, Faisal
author_role author
dc.contributor.none.fl_str_mv Bourouis Chebata, Mahmoud
Universitat Rovira i Virgili. Departament d'Enginyeria Mecànica
dc.subject.none.fl_str_mv Refrigeració per absorció
Transferència de calor i masa
Contactors de membrana
Refrigeración por absorción
Transferencia de calor y masa
Contactores de membrana
Absorption refrigeration
Heat and mass transfer
Membrane contactors
Enginyeria i Arquitectura
536
6
62
621
topic Refrigeració per absorció
Transferència de calor i masa
Contactors de membrana
Refrigeración por absorción
Transferencia de calor y masa
Contactores de membrana
Absorption refrigeration
Heat and mass transfer
Membrane contactors
Enginyeria i Arquitectura
536
6
62
621
description Absorption refrigeration technology, which has the ability to utilize heat directly for cooling purposes, has been one of the most widely used technologies for refrigeration and cooling applications since the early stages of refrigeration technology. Working fluid mixtures employed in the absorption cooling systems are environmental friendly and do not contribute in green house gas emission when compared to vapour compression systems which also use costly mechanical energy input. However, high initial costs and bigger size are some of the main obstacles that impede their wide use in small scale residential buildings and transport sector. In order to overcome these obstacles, design and configuration of the system and its components need to be reinvestigated in order to achieve compact components and reduce the size of the system. Use of membrane contactors in the form of hollow fiber membrane module or plate-and-frame membrane module is one of the alternatives to achieve compact components. Absorber is an important component of the absorption refrigeration system and plays a critical role in the overall performance, size, and capital cost of the system. In this study, numerical analyses are performed to evaluate the performance of a plate-and-frame membrane contactor based absorber employing water/(LiBr + LiI + LiNO3 + LiCl) and water/(LiNO3+KNO3+NaNO3) working fluid mixtures for air cooled absorption cooling systems and multi-stage high temperature heat sources applications, respectively. CFD tool ANSYS/FLUENT 14.0 is used to perform the simulation and investigate in detail the heat and mass transfer mechanisms and the fluid dynamics behaviour at local levels in the channels. Moreover, a MATLAB code is developed to investigate the effect of membrane material characteristics and operating conditions on the absorption performance of the absorber. This study recommends optimum operating and design parameters to effectively utilize the membrane based absorber.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016
2018
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
info:eu-repo/semantics/publishedVersion
format doctoralThesis
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10803/395951
url http://hdl.handle.net/10803/395951
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 175 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat Rovira i Virgili
publisher.none.fl_str_mv Universitat Rovira i Virgili
dc.source.none.fl_str_mv TDX (Tesis Doctorals en Xarxa)
reponame:TDR. Tesis Doctorales en Red
instname:CBUC, CESCA
instname_str CBUC, CESCA
reponame_str TDR. Tesis Doctorales en Red
collection TDR. Tesis Doctorales en Red
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869413153554563072
score 15,300724

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