Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system

Restrictive environmental regulations are driving the use of CO 2 as working fluid in commercial vapour compression plants due to its ultra-low global warming potential (GWP 100 = 1) and its natural condition. However, at high ambient temperatures transcritical operating conditions are commonly achi...

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Autores: Astrain Ulibarrena, David, Merino Vicente, Amaya, Catalán Ros, Leyre, Aranguren Garacochea, Patricia, Araiz Vega, Miguel, Sánchez, Daniel, Cabello, Ramón, Llopis, R.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2019
País:España
Institución:Universidad Pública de Navarra
Repositorio:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
OAI Identifier:oai:academica-e.unavarra.es:2454/36154
Acceso en línea:https://hdl.handle.net/2454/36154
Access Level:acceso abierto
Palabra clave:CO2
Subcooling
R744
Thermoelectricity
Transcritical
COP
Computational model
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spelling Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling systemAstrain Ulibarrena, DavidMerino Vicente, AmayaCatalán Ros, LeyreAranguren Garacochea, PatriciaAraiz Vega, MiguelSánchez, DanielCabello, RamónLlopis, R.CO2SubcoolingR744ThermoelectricityTranscriticalCOPComputational modelRestrictive environmental regulations are driving the use of CO 2 as working fluid in commercial vapour compression plants due to its ultra-low global warming potential (GWP 100 = 1) and its natural condition. However, at high ambient temperatures transcritical operating conditions are commonly achieved causing low energy efficiencies in refrigeration facilities. To solve this issue, several improvements have been implemented, especially in large centralized plants where ejectors, parallel compressors or subcooler systems, among others, are frequently used. Despite their good results, these measures are not suitable for small-capacity systems due mainly to the cost and the complexity of the system. Accordingly, this work presents a new subcooling system equipped with thermoelectric modules (TESC), which thanks to its simplicity, low cost and easy control, results very suitable for medium and small capacity plants. The developed methodology finds the gas-cooler pressure and the electric voltage supplied to the TESC system that maximizes the overall COP of the plant taking into account the ambient temperature, the number of thermoelectric modules used and the thermal resistance of the heat exchangers included in the TESC. The obtained results reveal that, with 20 thermoelectric modules, an improvement of 20% in terms of COP and of 25.6% regarding the cooling capacity can be obtained compared to the base cycle of CO 2 of a small cooling plant refrigerated by air. Compared to a cycle that uses an internal heat exchanger IHX, the improvements reach 12.2% and 19.5% respectively.The authors would like to acknowledge the support of the Spanish Ministry of Science, Innovation and Universities for the funding under the FPU Program (FPU16/05203).ElsevierIngeniaritzaInstitute of Smart Cities - ISCIngeniería2019info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttps://hdl.handle.net/2454/36154reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarrainstname:Universidad Pública de NavarraInglés© 2019 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0.https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:academica-e.unavarra.es:2454/361542026-06-17T12:41:47Z
dc.title.none.fl_str_mv Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
title Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
spellingShingle Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
Astrain Ulibarrena, David
CO2
Subcooling
R744
Thermoelectricity
Transcritical
COP
Computational model
title_short Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
title_full Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
title_fullStr Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
title_full_unstemmed Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
title_sort Improvements in the cooling capacity and the COP of a transcritical CO 2 refrigeration plant operating with a thermoelectric subcooling system
dc.creator.none.fl_str_mv Astrain Ulibarrena, David
Merino Vicente, Amaya
Catalán Ros, Leyre
Aranguren Garacochea, Patricia
Araiz Vega, Miguel
Sánchez, Daniel
Cabello, Ramón
Llopis, R.
author Astrain Ulibarrena, David
author_facet Astrain Ulibarrena, David
Merino Vicente, Amaya
Catalán Ros, Leyre
Aranguren Garacochea, Patricia
Araiz Vega, Miguel
Sánchez, Daniel
Cabello, Ramón
Llopis, R.
author_role author
author2 Merino Vicente, Amaya
Catalán Ros, Leyre
Aranguren Garacochea, Patricia
Araiz Vega, Miguel
Sánchez, Daniel
Cabello, Ramón
Llopis, R.
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ingeniaritza
Institute of Smart Cities - ISC
Ingeniería
dc.subject.none.fl_str_mv CO2
Subcooling
R744
Thermoelectricity
Transcritical
COP
Computational model
topic CO2
Subcooling
R744
Thermoelectricity
Transcritical
COP
Computational model
description Restrictive environmental regulations are driving the use of CO 2 as working fluid in commercial vapour compression plants due to its ultra-low global warming potential (GWP 100 = 1) and its natural condition. However, at high ambient temperatures transcritical operating conditions are commonly achieved causing low energy efficiencies in refrigeration facilities. To solve this issue, several improvements have been implemented, especially in large centralized plants where ejectors, parallel compressors or subcooler systems, among others, are frequently used. Despite their good results, these measures are not suitable for small-capacity systems due mainly to the cost and the complexity of the system. Accordingly, this work presents a new subcooling system equipped with thermoelectric modules (TESC), which thanks to its simplicity, low cost and easy control, results very suitable for medium and small capacity plants. The developed methodology finds the gas-cooler pressure and the electric voltage supplied to the TESC system that maximizes the overall COP of the plant taking into account the ambient temperature, the number of thermoelectric modules used and the thermal resistance of the heat exchangers included in the TESC. The obtained results reveal that, with 20 thermoelectric modules, an improvement of 20% in terms of COP and of 25.6% regarding the cooling capacity can be obtained compared to the base cycle of CO 2 of a small cooling plant refrigerated by air. Compared to a cycle that uses an internal heat exchanger IHX, the improvements reach 12.2% and 19.5% respectively.
publishDate 2019
dc.date.none.fl_str_mv 2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2454/36154
url https://hdl.handle.net/2454/36154
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.rights.none.fl_str_mv © 2019 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0.
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv © 2019 Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0.
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
instname:Universidad Pública de Navarra
instname_str Universidad Pública de Navarra
reponame_str Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
collection Academica-e. Repositorio Institucional de la Universidad Pública de Navarra
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.81155

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