ABSTRACT
The purpose of this study was to determine the performance improvement of a domestic refrigerator that used a parallel expansion device compared to one using a single expansion device. The experiment was conducted by replacing the single expansion device with a parallel expansion device on a domestic refrigerator with a capacity of 120 liters and using R-134a as working fluid. To get the experimental data, measurements were performed on the cooling load through various temperatures (from 30°C to -30°C). The experimental result showed that the use of parallel expansion generated an increase of 17%in the Coefficient of Performance (COP). The pressure ratio was also lower, so that it caused the compressor to work more efficiently and saved electrical power consumption required by the refrigerator.
