Abstract
Effect of condenser fouling is evaluated on the performance of a vapour compression system with refrigerants HFO1234yf and HFO1234ze as an alternative to HFC134a. The condenser coolant temperature has been varied between 35 and 40°C to evaluate the effect of fouling at different condenser temperatures. A simulation model is developed in EES for computing the results. The results have been computed by varying condenser conductance. The same has been validated with literature available before calculating the results. It is observed that the condenser fouling has larger effect on compressor power (Wcp%) as it increases up to 9.12 for R1234yf and 7.41 for R1234ze, whereas for R134a its value increases up to 7.38. The cooling capacity (Qevap%) decreases up to 13.25 for R1234yf and 8.62 for R1234ze, whereas for R134a its value decreases up to 8.76. The maximum percentage of decrease in value of COP is up to 19.29 for R1234yf and 14.47 for R1234ze, whereas for R134a its value decreases up to 14.49. The second-law efficiency is also observed to decrease with decrease in the condenser conductance. The performance of HFO1234ze is found to be better under fouled conditions in comparison to R134a and R1234yf.
Highlights
The most commonly used refrigerants in recent past were R11, R12, and R22 which because of their high ODP have been either phased out or under consideration for the same
The results showed that the coefficient of performance (COP), capacity, and compressor discharge temperature for HFO1234yf are 2.7%, 4.0%, and 6.5∘C lower than those of HFC134a and the amount of charge required for HFO1234yf reduced up to 10%
The performance is evaluated with three refrigerants (R134a, R1234yf, and R1234ze)
Summary
The most commonly used refrigerants in recent past were R11, R12, and R22 which because of their high ODP have been either phased out or under consideration for the same. The results showed that the COP, capacity, and compressor discharge temperature for HFO1234yf are 2.7%, 4.0%, and 6.5∘C lower than those of HFC134a and the amount of charge required for HFO1234yf reduced up to 10% According to this literature survey HFOs are future refrigerant for use in vapour compression systems. Qureshi and Zubair [9] discussed the effect of fouling on the performance of VCRS on the basis of first and second law and calculated the results for a particular set of data assuming condenser coolant temperature of 40∘C and inlet air temperature to evaporator as 0∘C and isentropic efficiency of compressor is assumed as 65%. Such situation of drop in conductance may occur due to nonservicing of the mobile air-conditioning system over a long period of usage of vehicle
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