Perancangan Pipa Kapiler dan Pemilihan Kompresor untuk Meningkatkan Coefficient of Performance (COP) Lemari Pendingin

Abstract

The refrigeration system is a process of absorbing heat from a high temperature room and then transferring the heat to a certain medium that has a lower temperature and still maintains the temperature as needed. The refrigerator has main components, namely the compressor, condenser, capillary tube, and evaporator. The cooling load is the heat that will be absorbed by the evaporator and affects the performance of the refrigerator. Determining the diameter and length of the capillary tube is very necessary to achieve optimal performance so that the compressor can suck refrigerant from the evaporator the same as that passed through the capillary tube. The selection of the compressor is based on the total cooling load so that the mass flow rate and enthalpy difference are obtained. In this design, the total cooling load is 0,36144 kW, the temperature achieved is -18 ˚C, the mass flow rate is 0,002751 kg/s, the compressor power is 113,6 W with an electric current of 0,6 A, the heat released by the condenser is 0,475 kW, the ideal COP is 3,18, the diameter and length of the capillary tube are 0,66 mm and 2,014 m.