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ABSTRACT

The performance of the refrigeration machine of ice flake is determined by the ratio of refrigeration capacity to compressor work. The performance can consider the influence of the level of subcooling conditions at the condenser outlet and superheating at the compressor suction line. The study aims to model the effect of condenser outlet and compressor suction line temperatures at low pressure on the performance of flake ice machines. The object studied is a flake ice machine with a capacity of 6 tonnes/day, with refrigerant temperature and pressure data collected for analysis of energy. Energy analysis modeling of the vapor compression refrigeration cycle of flake ice machines was developed using an Engineering Equation Solver (EES) to observe the effect of changes in subcooling and superheating temperatures under different low-pressure conditions. The level of subcooling conditions at the condenser outlet and compressor suction line has a significant effect on the performance of the refrigeration system. The coefficient of performance (COP) value increases with decreasing subcooling temperature and pressure. The highest COP value was achieved at a subcooling temperature of 29°C with a pressure of 180 kPa. In contrast to the superheating condition, the COP value increases with increasing temperature and decreasing pressure levels. The highest COP value was achieved at a superheating temperature of 10°C with a low pressure of 180 kPa. The selection of subcooling, superheating and working pressure levels can be a recommendation for flake ice machine operators.

Keywords: flake ice, performance, subcooling, superheating