Sustainability Analysis in Terms Energy and Exergy Evaluation of Two- Stage Vapour Compression Refrigeration System Using Eight Ecofriendly Refrigerants

Comparative thermodynamic analysis using first and second law of eight ecofriendly R152a, R600, R600a, R410a, R290, R1234yf, R404a and R134a refrigerants in the two stage vapour compression refrigeration system on the basis of energetic and exergetic performances is presented in this paper. The thermal performance parameters such as entropy generations, first law efficiency in terms of COP, second-law efficiency in terms of exergetic efficiency, sustainability index were investigated at different ambient condition. It is found that that both energy and exergy efficiencies of R134a is 8.97% and 5.38% lower than R152a and R600 respectively. Numerical computation was carried out using ecofriendly refrigerants and It was also observed that the irreversibility was minimal at higher evaporator temperatures while condenser temperature was responsible for highest irreversibility in terms of thermal energy losses in the two stage vapour compression refrigeration system. Sustainability index for R152a (1.96) was highest compared to other ecofriendly refrigerants.