PERFORMANCE OF AN INTEGRAL DISPLAY CABINET WORKING WITH CO2 IN SUBCRITICAL AND TRANSCRITICAL CYCLE

摘要

Carbon dioxide is one of the most promising, environmentally friendly and energy efficient refrigerant.Nowadays, many centralized CO_2 systems are already installed in supermarketsas a replacement of HFCrefrigerants with higher GWP in order to reduce environmental impact and energy consumption.Nevertheless,integral display cabinets using CO_2 are still rare, and the performance of the technology in this case is notwell known. In this context, a test bench has been developed to evaluate the performance of an integraldisplay cabinet using CO_2 as a refrigerant. Depending on the ambient temperature, the refrigerating systemis operating in subcritical, near critical or transcritical mode. Measurements have been performed withdifferent ambient conditions to characterize the display cabinet performance.