Abstract
The present work focuses on analytical computation of thermodynamic performance of actual vapour compression refrigeration system by using six pure refrigerants. The refrigerants are namely R22, R32, R134a, R152a, R290 and R1270 respectively. A MATLAB code is developed to compute the thermodynamic performance parameters of actual vapour compression system such as refrigeration effect, compressor work, COP, power per ton of refrigeration, compressor discharge temperature and volumetric refrigeration capacity at condensing and evaporating temperatures of 54.4oC and 7.2oC respectively. Analytical results exhibited that COP of both R32 and R134a are 15.95% and 11.71% higher among the six investigated refrigerants. However R32 and R134a cannot be replaced directly into R22 system. This is due to their higher compressor discharge temperature and poor volumetric capacity respectively. The discharge temperature of both R1270 and R290 are lower than R22 by 20-26oC. Volumetric refrigeration capacity of R1270 (3197 kJ/m3) is very close to that of volumetric capacity of R22 (3251 kJ/m3). Both R1270 and R290 shows good miscibility with R22 mineral oil. Overall R1270 would be a suitable ecofriendly refrigerant to replace R22 from the stand point of ODP, GWP, volumetric capacity, discharge temperature and miscibility with mineral oil although its COP is lower.
Highlights
Chlorofluorocarbons (CFCs) and Hydrochlorofluorocarbons (HCFCs) was extensivenly used in vapour compression based refrigeration industries from past several years due to their better thermophysical and thermodynamic properties [1]
In this study six pure refrigerants like R22, R32, R134a, R152a, R290 and R1270 are considered and thermodynamic properties of all the six pure refrigerants are must require to do the thermodynamic analysis of vapour compression refrigeration system
From the figure 2 it is noticed that refrigeration effect of refrigerants like R32, R152a, R290 and R1270 are higher than the R22
Summary
Chlorofluorocarbons (CFCs) and Hydrochlorofluorocarbons (HCFCs) was extensivenly used in vapour compression based refrigeration industries from past several years due to their better thermophysical and thermodynamic properties [1]. Several theoretical and expermintal studies were carried to find an appropriate fluids to replace R22 and R134a respectively. Experimental peformance tests were carried out in a vapour compression plant with R134a, R152a, R290, R600a, R1234yf and R1234ze(E) respectively [4]. Theoretical and expermintal investiagtions were done in an air conditioner under different operating conditions with R161 and R22 [8] Both theoretical and exprimental results exhibited that energy efficiency ratio of R161 was superior than the R22. Therortical performance studies were carried out in a simple saturation vapour compression system with R1234yf, R161, R152a and R134a respectively [10]. The present work emphasis on performance computation of six pure refrigerants based on actual vapour compression cycle in order to find an appropriate candidate to replace R22
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