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Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditions

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Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditions

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dc.contributor.author Sánchez, Daniel es_ES
dc.contributor.author Patiño, Jorge es_ES
dc.contributor.author Sanz Kock, Carlos es_ES
dc.contributor.author Llopis, Rodrigo es_ES
dc.contributor.author Cabello, Ramón es_ES
dc.contributor.author Torrella Alcaraz, Enrique es_ES
dc.date.accessioned 2015-10-29T11:57:19Z
dc.date.available 2015-10-29T11:57:19Z
dc.date.issued 2014-05
dc.identifier.issn 1359-4311
dc.identifier.uri http://hdl.handle.net/10251/56724
dc.description.abstract Unlike other refrigerants, R744 (or carbon dioxide) has a very low critical temperature (30.98 C) which hampers working in subcritical conditions especially when the environment is used as a heat rejection sink. Accordingly, CO2 refrigeration plants are designed to work in supercritical conditions. Notwithstanding, the heat rejection temperature may decrease below the critical one during long periods of time (for example in winter or autumn), thereby offering the possibility of operating in subcritical conditions. According with this and in order to give useful information for related system design and operation, the aim of this paper is to analyse the behaviour of a CO2 refrigeration plant designed for supercritical conditions when it works in subcritical conditions. To achieve this objective a series of experimental assays has been performed. The results obtained shown a decrease in the coefficient of performance (COP) and cooling capacity ðQ_ evÞ if the heat exchanger designed as a gas-cooler operates as a condenser in some cases. To avoid this, a possible solution is proposed consists on using an inverter drive to reduce the refrigerant mass flow rate in order to enhance the gas-cooler/condenser thermal effectiveness. From the experimental results obtained, it could be remarked that if the heat exchanger is designed as a condenser and operates as a gas-cooler, the energy performance of the refrigeration plant could improve under certain subcritical and supercritical conditions. es_ES
dc.description.sponsorship The authors are indebted to the Spanish Ministry of Education and Science (IESCO2) and to the Spanish Ministry of the Environment and Rural and Marine Affairs (ENE2011-22968) for the economic support given to the present work. en_EN
dc.language Inglés es_ES
dc.publisher Elsevier es_ES
dc.relation.ispartof Applied Thermal Engineering es_ES
dc.rights Reserva de todos los derechos es_ES
dc.subject R744 es_ES
dc.subject Supercritical es_ES
dc.subject Subcritical es_ES
dc.subject Gas-cooler es_ES
dc.subject Condenser es_ES
dc.subject.classification MAQUINAS Y MOTORES TERMICOS es_ES
dc.title Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditions es_ES
dc.type Artículo es_ES
dc.identifier.doi 10.1016/j.applthermaleng.2014.02.005
dc.relation.projectID info:eu-repo/grantAgreement/MICINN//ENE2011-22968/ES/REVALORIZACION DE FOCOS TERMICOS RESIDUALES A BAJA Y MEDIA TEMPERATURA. EXPERIMENTACION EN GENERACION ELECTRICA CON ORC, Y EN PRODUCCION DE FRIO MEDIANTE/ es_ES
dc.rights.accessRights Cerrado es_ES
dc.contributor.affiliation Universitat Politècnica de València. Departamento de Termodinámica Aplicada - Departament de Termodinàmica Aplicada es_ES
dc.description.bibliographicCitation Sánchez, D.; Patiño, J.; Sanz Kock, C.; Llopis, R.; Cabello, R.; Torrella Alcaraz, E. (2014). Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditions. Applied Thermal Engineering. 66(1-2):227-238. https://doi.org/10.1016/j.applthermaleng.2014.02.005 es_ES
dc.description.accrualMethod S es_ES
dc.relation.publisherversion http://dx.doi.org/10.1016/j.applthermaleng.2014.02.005 es_ES
dc.description.upvformatpinicio 227 es_ES
dc.description.upvformatpfin 238 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion es_ES
dc.description.volume 66 es_ES
dc.description.issue 1-2 es_ES
dc.relation.senia 282038
dc.identifier.eissn 1873-5606
dc.contributor.funder Ministerio de Ciencia e Innovación es_ES
dc.contributor.funder Ministerio de Educación


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