抄録
The purpose of this paper is to investigate the influence of the shortage of refrigerant amount relating to the refrigerating capacity and COP by analyzing two years' operating data of 40USRT Brine Chiller using CO_2. The shortage of refrigerant amount decreases refrigerating capacity because of inadequate condensation of refrigerant in gas cooler. In addition, it also decreases COP although CO_2 temperature at the gas cooler outlet is maintained to obtain maximum point of COP corresponding to compressor discharge. Therefore, retaining the appropriate refrigerant amount and controlling the discharge pressure of compressor give this system higher performance efficiently.
