Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants

The aim of this work is to study the thermal and fluid-dynamic behavior of vapor compression refrigerating systems and their constitutive elements (heat exchangers, expansion devices, compressors and connecting tubes) focused on the use of natural refrigerants (carbon dioxide, isobutane and ammonia)...

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Autor: Ablanque Mejía, Nicolás
Tipo de recurso: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2010
País:España
Institución:CBUC, CESCA
Repositorio:TDR. Tesis Doctorales en Red
OAI Identifier:oai:www.tdx.cat:10803/77824
Acceso en línea:http://hdl.handle.net/10803/77824
https://dx.doi.org/10.5821/dissertation-2117-94521
Access Level:acceso abierto
Palabra clave:621
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dc.title.none.fl_str_mv Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
title Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
spellingShingle Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
Ablanque Mejía, Nicolás
621
title_short Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
title_full Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
title_fullStr Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
title_full_unstemmed Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
title_sort Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerants
dc.creator.none.fl_str_mv Ablanque Mejía, Nicolás
author Ablanque Mejía, Nicolás
author_facet Ablanque Mejía, Nicolás
author_role author
dc.contributor.none.fl_str_mv Rigola Serrano, Joaquim
Oliva, Asensio
Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics
dc.subject.none.fl_str_mv 621
topic 621
description The aim of this work is to study the thermal and fluid-dynamic behavior of vapor compression refrigerating systems and their constitutive elements (heat exchangers, expansion devices, compressors and connecting tubes) focused on the use of natural refrigerants (carbon dioxide, isobutane and ammonia). The specific topics analyzed throughout this thesis have arisen from the growing interest in environmentally friendly refrigerants that has led the CTTC group (Centro Tecnológico de Transferencia de Calor) to undertake significant research efforts and to take part in several projects with national and European institutions. The information reported herein represents a summary of the work carried out by the author during the last years together with the contributions provided by other members of the CTTC group. This thesis has led to the creation of some publications in International Conferences and indexed journals. The main achievement of this work has been the development of a flexible numerical tool based on several subroutines. The whole numerical infrastructure is the result of coupling the specific resolution procedures for each vapor compression refrigerating system component together with the whole system resolution algorithm. The simulations have been oriented to study the system thermodynamical characteristics as well as some relevant aspects of its particular elements. In addition to the numerical results a significant experimental work has also been carried out in the CTTC facilities due to the need for experimental validation. The author has been fully involved in data acquisition procedures and has also collaborated in the setting up of the experimental units. In general, all the studies conducted in this work have been presented following the same structure: i) numerical model and resolution procedure explanation; ii) model validation against experimental data; and iii) simulation results. The specific topics tackled within this thesis include the implementation of a two-phase numerical model to simulate the thermal and fluid-dynamic behavior of single- and two-phase flows inside ducts, the study of heat transfer coefficient empirical correlations for both cooling of carbon dioxide at transcritical conditions and evaporation of ammonia at overfeed conditions, the implementation of a numerical model to simulate capillary tubes in order to study their behavior at typical operational conditions found in household refrigerators working with isobutane, the development of a two-phase flow distribution model to simulate heat exchangers made up by manifold systems, and the study of vapor compression refrigeration cycles with special emphasis on carbon dioxide transcritical situations. The set of the numerical models implemented has demonstrated to be a flexible tool as several different aspects of refrigeration vapor compression systems have been successfully simulated and study. It has also demonstrated to be an accurate tool as the numerical results achieved have shown good agreement against experimental data
publishDate 2010
dc.date.none.fl_str_mv 2010
2012
2012
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/10803/77824
https://dx.doi.org/10.5821/dissertation-2117-94521
url http://hdl.handle.net/10803/77824
https://dx.doi.org/10.5821/dissertation-2117-94521
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 204 p.
application/pdf
application/pdf
dc.publisher.none.fl_str_mv Universitat Politècnica de Catalunya
publisher.none.fl_str_mv Universitat Politècnica de Catalunya
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
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spelling Numerical simulation and experimental validation of vapor compression refrigerating systems: special emphasis on natural refrigerantsAblanque Mejía, Nicolás621The aim of this work is to study the thermal and fluid-dynamic behavior of vapor compression refrigerating systems and their constitutive elements (heat exchangers, expansion devices, compressors and connecting tubes) focused on the use of natural refrigerants (carbon dioxide, isobutane and ammonia). The specific topics analyzed throughout this thesis have arisen from the growing interest in environmentally friendly refrigerants that has led the CTTC group (Centro Tecnológico de Transferencia de Calor) to undertake significant research efforts and to take part in several projects with national and European institutions. The information reported herein represents a summary of the work carried out by the author during the last years together with the contributions provided by other members of the CTTC group. This thesis has led to the creation of some publications in International Conferences and indexed journals. The main achievement of this work has been the development of a flexible numerical tool based on several subroutines. The whole numerical infrastructure is the result of coupling the specific resolution procedures for each vapor compression refrigerating system component together with the whole system resolution algorithm. The simulations have been oriented to study the system thermodynamical characteristics as well as some relevant aspects of its particular elements. In addition to the numerical results a significant experimental work has also been carried out in the CTTC facilities due to the need for experimental validation. The author has been fully involved in data acquisition procedures and has also collaborated in the setting up of the experimental units. In general, all the studies conducted in this work have been presented following the same structure: i) numerical model and resolution procedure explanation; ii) model validation against experimental data; and iii) simulation results. The specific topics tackled within this thesis include the implementation of a two-phase numerical model to simulate the thermal and fluid-dynamic behavior of single- and two-phase flows inside ducts, the study of heat transfer coefficient empirical correlations for both cooling of carbon dioxide at transcritical conditions and evaporation of ammonia at overfeed conditions, the implementation of a numerical model to simulate capillary tubes in order to study their behavior at typical operational conditions found in household refrigerators working with isobutane, the development of a two-phase flow distribution model to simulate heat exchangers made up by manifold systems, and the study of vapor compression refrigeration cycles with special emphasis on carbon dioxide transcritical situations. The set of the numerical models implemented has demonstrated to be a flexible tool as several different aspects of refrigeration vapor compression systems have been successfully simulated and study. It has also demonstrated to be an accurate tool as the numerical results achieved have shown good agreement against experimental dataThe aim of this work is to study the thermal and fluid-dynamic behavior of vapor compression refrigerating systems and their constitutive elements (heat exchangers, expansion devices, compressors and connecting tubes) focused on the use of natural refrigerants (carbon dioxide, isobutane and ammonia). The specific topics analyzed throughout this thesis have arisen from the growing interest in environmentally friendly refrigerants that has led the CTTC group (Centro Tecnológico de Transferencia de Calor) to undertake significant research efforts and to take part in several projects with national and European institutions. The information reported herein represents a summary of the work carried out by the author during the last years together with the contributions provided by other members of the CTTC group. This thesis has led to the creation of some publications in International Conferences and indexed journals. The main achievement of this work has been the development of a flexible numerical tool based on several subroutines. The whole numerical infrastructure is the result of coupling the specific resolution procedures for each vapor compression refrigerating system component together with the whole system resolution algorithm. The simulations have been oriented to study the system thermodynamical characteristics as well as some relevant aspects of its particular elements. In addition to the numerical results a significant experimental work has also been carried out in the CTTC facilities due to the need for experimental validation. The author has been fully involved in data acquisition procedures and has also collaborated in the setting up of the experimental units. In general, all the studies conducted in this work have been presented following the same structure: i) numerical model and resolution procedure explanation; ii) model validation against experimental data; and iii) simulation results. The specific topics tackled within this thesis include the implementation of a two-phase numerical model to simulate the thermal and fluid-dynamic behavior of single- and two-phase flows inside ducts, the study of heat transfer coefficient empirical correlations for both cooling of carbon dioxide at transcritical conditions and evaporation of ammonia at overfeed conditions, the implementation of a numerical model to simulate capillary tubes in order to study their behavior at typical operational conditions found in household refrigerators working with isobutane, the development of a two-phase flow distribution model to simulate heat exchangers made up by manifold systems, and the study of vapor compression refrigeration cycles with special emphasis on carbon dioxide transcritical situations. The set of the numerical models implemented has demonstrated to be a flexible tool as several different aspects of refrigeration vapor compression systems have been successfully simulated and study. It has also demonstrated to be an accurate tool as the numerical results achieved have shown good agreement against experimental dataDOCTORAT EN ENGINYERIA TÈRMICA (Pla 1998)Universitat Politècnica de CatalunyaRigola Serrano, JoaquimOliva, AsensioUniversitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics201220122010info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersion204 p.application/pdfapplication/pdfhttp://hdl.handle.net/10803/77824https://dx.doi.org/10.5821/dissertation-2117-94521TDX (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:10803/778242026-06-14T12:46:07Z
score 15,301603

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