Abstract
Environmental issues becomes a priority on the refrigeration system development. The mainissues are global warming and ozone depletion which are emitted from the conventional refrigeration system.One of the natural and clean refrigerants is Carbon dioxide (CO2). CO2 refrigeration system however still haslow performance when operating at high ambient temperature. This study aim is to investigate the performanceof CO2 transcritical refrigeration system in high outdoor temperature. The research was carried out bytheoretical study and numerical analysis of the refrigeration system using the EES (Engineering EquationSolver) program. Data input and simulation validation were obtained from experimental and secondary data.The result showed that the coefficient of performance (COP) decreased gradually with the outdoor temperaturevariation increasing. With temperature input increases between 25oC – 45oC, the performance (indicated byoverall COP) decreased by 3.0 %. These results will be significantly important for a preliminary reference toimprove the CO2 refrigeration system design in hot climate temperature application.
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