Methods for Improving Thermodynamic Performance of Vapour Compression Refrigeration Systems using Thirteen Ecofriendly Refrigerants in Primary Circuit and Tio2 Nano Particles Mixed with R718 used in Secondary Evaporator Circuit for Reducing Global Warming

Abstract

The methods for improving first law and second law efficiency have been considered in this paper by using water as secondary coolent in evaporator with nano particles such als Al2O3 and TiO2 mixed R718 refrigerant is investigated in this paper. Detailed energy and exergy analysis of multi-evaporators at different temperatures in the vapour compression refrigeration systems have been done in terms of performance parameter for R507a, R125, R134a, R290, R600, R600a, R410a, R407c, R404a and R152a refrigerants. The numerical computations have been carried out for both systems. The use of nano particles improves the first law and second law performance significantly. The best performance is found using R152a and worst performance is observed using R410a. Due to flammable nature of R290, R600, R600a and R152a The results were compared by using water in secondary circuit with nano refrigerants and without nano particles used and it was found that use of nano particles improves thermal performances. The first law performance improvement in terms of COP and second law performance in terms of exergetic efficiency (rational efficiency) using TiO2 is better than using Al2O3 with R718 refrigerant in the secondary evaporator circuit.