Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditions
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Scholar |
Altres documents de l'autoria: Sánchez García-Vacas, Daniel; Patiño Pérez, Jorge; Sanz Kock, Carlos; Llopis, Rodrigo; Cabello López, Ramón; Torrella Alcaraz, Enrique
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
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http://dx.doi.org/10.1016/j.applthermaleng.2014.02.005 |
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Títol
Energetic evaluation of a CO2 refrigeration plant working in supercritical and subcritical conditionsAutoria
Data de publicació
2014-05Editor
ElsevierISSN
1359-4311Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://www.sciencedirect.com/science/article/pii/S1359431114000829#Paraules clau / Matèries
Resum
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. ... [+]
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 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. [-]
Publicat a
Applied Thermal Engineering Vol. 66, no. 1–2, 2014Drets d'accés
Copyright © 2014 Elsevier Ltd.
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