Conference Year

2016

Keywords

Refrigerant, Compressor, Modeling, Cycle, Simulation

Abstract

The problem of global warming is crucial, with temperature rise estimated to about 0.4 and 0.8 °C over the past 100 years, and is predicted to rise between 1.4 and 5.8 °C by the year 2100. The meetings of the global leaders in the recent COP21 have gathered global consensus to fight the global warming. One of the important approach in aiding toward fighting global warming is to use environmental friendly refrigerants. Recently a few new low GWP refrigerants have been introduced. In this paper, we will first discuss the refrigeration cycle efficiencies of these new low GWP refrigerants as compared to the existing ones. Many of the currently widely used refrigerants will be phased out soon. The basis of the comparison will be the ANSI/AHRI 540 testing standards, which is suitable for positive displacement refrigerant compressors. The testing cycle for the refrigerant will be based on the basic vapour-compression refrigeration cycle. With these conditions imposed on all the refrigerants tested, the coefficient of performance (COP), specific heat adsorption, work input required, as well as the working pressure of the refrigerants will be compared and discussed.  The effects of these new low GWP refrigerants and their properties on the compressor performance will be evaluated, discussed and compared. Compressor performance parameters such as specific work input, discharge pressure and temperature, volumetric efficiency, isentropic efficiency will also be shown and discussed.

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