PERFORMANCE ANALYSIS OF TRANSCRITICAL CO2 REFRIGERATION SYSTEM FOR SUPERMARKET APPLICATION

Environmental issues becomes a priority on the refrigeration system development. The main issues 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 has low performance when operating at high ambient temperature. This study aim is to investigate the performance of CO2 transcritical refrigeration system in high outdoor temperature. The research was carried out by theoretical study and numerical analysis of the refrigeration system using the EES (Engineering Equation Solver) 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 temperature variation increasing. With temperature input increases between 25 degrees C-45 degrees C, the performance (indicated by overall COP) decreased by 3.0 %. These results will be significantly important for a preliminary reference to improve the CO2 refrigeration system design in hot climate temperature application.