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dc.contributor.authorSánchez García-Vacas, Daniel
dc.contributor.authorPatiño Pérez, Jorge
dc.contributor.authorSanz Kock, Carlos
dc.contributor.authorLlopis Doménech, Rodrigo
dc.contributor.authorCabello López, Ramón
dc.contributor.authorTorrella Alcaraz, Enrique
dc.description.abstractUnlike 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 View the MathML source 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.ca_CA
dc.format.extent12 p.ca_CA
dc.relation.isPartOfApplied Thermal Engineering Vol. 66, no. 1–2, 2014ca_CA
dc.rightsCopyright © 2014 Elsevier Ltd.ca_CA
dc.titleEnergetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditionsca_CA

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