Analysis of the impact of expansion valve pressure variation on the performance of an r-22 split air conditioning system

Abstract As a tropical country, Indonesia has several impacts on the environment and community life. This makes the use of cooling machines very important in Indonesia, especially in densely populated urban areas. Therefore, researchers will design an R-22 split air conditioning cooling machine and analyze the effect of the type of expansion valve and condenser fan speed on the characteristics and performance of the cooling machine with the aim of obtaining the best variation. The methods used in this research include the manufacture of cooling machines, data collection, and analysis. The variations used are capillary pipe expansion valves with lengths of 0.5 m, 1 m, and 1.5 m, as well as TXV (Thermostatic Expansion Valve) types. The analysis concluded that the variation using a 0.5-meter-long capillary pipe expansion valve and a condenser fan speed of 6.1 m/s produced a greater refrigerant mass flow rate than the other variations, namely 0.026 kg/s, and produced a greater actual COP of 6.4. This is because the greater the air flow rate to cool the condenser at a fan speed of 6.1 m/s, the less power is consumed by the compressor. Meanwhile, the actual COP and refrigerant mass flow rate increase with the increasing speed of the condenser cooling fan.