Simulation Analysis on Thermo Physical Properties of Hydrocarbon Refrigerants in Vapour Compression Refrigeration System


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Abstract


This article represents the possibility usage of hydrocarbon refrigerants in vapour compression refrigeration systems as an alternate to conventional refrigerants like R12 and R134a. Hydrocarbon mixtures (HCMs) are having unique characteristics like eco friendly, better heat transfer, zero ODP and negligible GWP. Suitable safety precautions are to be implemented due to their flammability. Based on the thermo physical properties of the refrigerants, the standard performance parameters like pressure ratio, volumetric efficiency, discharge temperature, condenser heat rejection rate and COP are computed at different temperatures. The mixture of Propane (R290) and Isobutane (R600a) is considered as a refrigerant in this analysis at various mass fractions.
The effect of condenser temperature (30C to 65C) with evaporator temperature of -10C shows that the proposed HCMs having low pressure ratio & discharge temperature, higher volumetric efficiency & condenser heat rejection rate as compared to R12 and R134a. The effect of evaporator temperature (-30C to 0C) with condenser temperature of 40C is also computationally analysised and similar performance results were obtained. Pressure ratio of HCMs is about 6.37% and 17.11% lower than R12 and R134a respectively and the volumetric efficiency is enhanced about 1.06% and 2.12%. The condenser heat rejection rate is also improved about 57.86% and 46.49% greater than R12 and R134 respectively. The results also prove that COP of the HCMs is approached very close to R12 and R134a.


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Keywords


HCMs; COP; Heat Transfer; Condenser and Evaporator Temperatures

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