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Thermodynamic analysis of vapour compression refrigeration system with sustainable refrigerant blends as alternatives to replace R22.

Number: pap. 2364

Author(s) : SHARMAS VALI S., ASHOK BABU T. P.

Summary

The phase out schedule of a hydrochlorofluorocarbon refrigerant R22 demands the development of an ecofriendly refrigerants. Since R22 has adverse ecological effects like high ODP and high GWP. Hence this paper emphasis on the thermodynamic analysis of various ozone friendly refrigerant blends as an alternatives to R22 used in a vapour compression refrigeration system (VCRS). In this work eight refrigerant blends consists of R290, R134a, R152a, R125 and R32 at various compositions are developed. All the developed refrigerants possess zero ODP and low GWP compared to R22. The main goal of the study is to calculate the performance characteristics of actual VCR cycle using R22 and its various developed alternatives. The performance characteristic of eight studied refrigerants are computed at evaporating and condensing temperature of 7.2°C and 54.4°C respectively by using a MATLAB code. The results showed that COP of a refrigerant mixture RM40 (3.541) is higher among the eight studied refrigerants and it is 0.2 % higher than the COP of R22 (3.534). GWP of RM40 (10) is lowest among the GWP of R22 (1760) and eight studied refrigerants. The compressor discharge temperature of RM40 is lowest among the eight studied refrigerants and it is reduced by 6.6oC when compared to R22. Power spent per ton of refrigeration of RM40 (0.992 kW/TR) is lower among the eight studied blends and it is marginally lower than that of R22 (0.994 kW/TR). Volumetric cooling of capacity of RM40 (2837 kJ/m3) is higher among the eight investigated mixtures and it is quite similar to R22 (3086 kJ/m3). Overall the thermodynamic performance of a novel binary blend RM40 (R290/R152a 95/5 composition mass %) is very close to R22 and hence it is a sustainable alternative refrigerant to replace R22.

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Pages: 10

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Details

  • Original title: Thermodynamic analysis of vapour compression refrigeration system with sustainable refrigerant blends as alternatives to replace R22.
  • Record ID : 30024518
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2018/07/09

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