DefinePK

Abstract

Generally, parameters for measuring the performance of air conditioning system is COP. In a thermodynamic analysis of air conditioning system, the losses that occur in the expansion valve is not considerable. In reality, the ice formation layer phenomenon is formed around the expansion valve during air conditioning system operation. Therefore, this paper presents a study of PTFE as expansion valve materials to reduce heat loss. The temperature distribution of R-134a refrigerant before and after the expansion valve was observed to determine its effect in comparison with expansion valve made of aluminum alloy. The AC system used in this study is a car air conditioning system that is removed from the car and driven by an electric motor. From the test results with the same refrigerant mass flow, the expansion valve made of PTFE generates potential heat absorption greater than the expansion valve made of aluminum. In conclusion, PTFE is promising to be developed as an expansion valve on car air conditioning system applications.