Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants

Doctorat internacional

Detalhes bibliográficos
Autor: Udroiu, Cosmin-Mihai
Formato: tesis doctoral
Estado:Versión publicada
Fecha de publicación:2025
País:España
Recursos:CBUC, CESCA
Repositorio:TDR. Tesis Doctorales en Red
OAI Identifier:oai:www.tdx.cat:10803/695139
Acesso em linha:http://hdl.handle.net/10803/695139
Access Level:acceso embargado
Palavra-chave:Ultra-low temperature
Vapor compression cycle
Natural refrigerants
Refrigeration
Tecnologia i enginyeria
62
620
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spelling Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerantsUdroiu, Cosmin-MihaiUltra-low temperatureVapor compression cycleNatural refrigerantsRefrigerationTecnologia i enginyeria62620Doctorat internacionalRefrigeration is essential for preserving sensitive products by maintaining temperatures below ambient. Vapor compression cycles are the standard method, but their efficiency drops as the temperature lift increases. Ultra-low temperature (ULT) applications, such as vaccine or biomedical storage, require significant temperature differences, making conventional systems inefficient and environmentally harmful. This thesis proposes a more sustainable solution using a cascade vapor compression cycle with natural refrigerants R290 (propane) and R170 (ethane). A detailed theoretical analysis identifies critical points, particularly at the expansion valve inlet, addressed by incorporating an interstage heat exchanger. An experimental prototype confirms the theoretical results, achieving COP improvements of up to 40 % at −70 °C and 20 % at −80 °C compared to the R404A/R23 baseline. The natural refrigerant pair also delivers greater cooling capacity with a lower mass flow rate and reduces CO₂-equivalent emissions by 37 %. These findings highlight the technical and environmental potential of natural refrigerants in ULT systems.Programa de Doctorat en Tecnologies Industrials i MaterialsUniversitat Jaume INavarro-Esbrí, JoaquínMota-Babiloni, AdriánNavarro-Esbrí, JoaquínUniversitat Jaume I. Escola de Doctorat202520252026info:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/publishedVersion165 p.application/pdfhttp://hdl.handle.net/10803/695139TDX (Tesis Doctorals en Xarxa)reponame:TDR. Tesis Doctorales en Redinstname:CBUC, CESCAInglésL'accés als continguts d'aquesta tesi queda condicionat a l'acceptació de les condicions d'ús establertes per la següent llicència Creative Commons: http://creativecommons.org/licenses/by-nc-nd/4.0/http://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/embargoedAccessoai:www.tdx.cat:10803/6951392026-06-14T12:46:07Z
dc.title.none.fl_str_mv Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
title Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
spellingShingle Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
Udroiu, Cosmin-Mihai
Ultra-low temperature
Vapor compression cycle
Natural refrigerants
Refrigeration
Tecnologia i enginyeria
62
620
title_short Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
title_full Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
title_fullStr Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
title_full_unstemmed Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
title_sort Analysis, development and experimental evaluation of ultra-low temperature cascade refrigeration systems with natural refrigerants
dc.creator.none.fl_str_mv Udroiu, Cosmin-Mihai
author Udroiu, Cosmin-Mihai
author_facet Udroiu, Cosmin-Mihai
author_role author
dc.contributor.none.fl_str_mv Navarro-Esbrí, Joaquín
Mota-Babiloni, Adrián
Navarro-Esbrí, Joaquín
Universitat Jaume I. Escola de Doctorat
dc.subject.none.fl_str_mv Ultra-low temperature
Vapor compression cycle
Natural refrigerants
Refrigeration
Tecnologia i enginyeria
62
620
topic Ultra-low temperature
Vapor compression cycle
Natural refrigerants
Refrigeration
Tecnologia i enginyeria
62
620
description Doctorat internacional
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2026
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/10803/695139
url http://hdl.handle.net/10803/695139
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/embargoedAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv embargoedAccess
dc.format.none.fl_str_mv 165 p.
application/pdf
dc.publisher.none.fl_str_mv Universitat Jaume I
publisher.none.fl_str_mv Universitat Jaume I
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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score 15,812455

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