Evaluation of Subcooling with Liquid-Suction Heat Exchanger on the Performance of Air Conditioning System Using R22/R410A/R290/R32 as Refrigerants

Rachmad Imbang Tritjahjono; Kasni Sumeru; Andriyanto Setyawan; Mohamad Firdaus Sukri

Authors

Rachmad Imbang Tritjahjono Department of Mechanical Engineering, Politeknik Negeri Bandung, Gegerkalong Hilir Ciwaruga, Bandung 40012 Indonesia
Kasni Sumeru Department of Refrigeration & Air Conditioning, Politeknik Negeri Bandung, Gegerkalong HilirCiwaruga, Bandung 40012 Indonesia
Andriyanto Setyawan Department of Refrigeration & Air Conditioning, Politeknik Negeri Bandung, Gegerkalong HilirCiwaruga, Bandung 40012 Indonesia
Mohamad Firdaus Sukri Green and Efficient Energy Technology (GrEET) Research Group, Universiti Teknikal Malaysia Melaka, Hang Tuah Jaya,76100 Durian Tunggal,Melaka, Malaysia

Keywords:

Air conditioning, cooling capacity, COP improvement, R290, R32

Abstract

This paper presents a numerical study to investigate the effect of subcoolingwith liquid-suction heat exchanger (LSHX) on the performance of air conditioning system using R22, R410A, R290 and R32 as refrigerants. In the near future, R290 and R32 refrigerants are projected to replace R22 and R410A as working fluids in the residential air conditioning. In this study, four parameters, i.e., the refrigerating effect, compressor work, COP and discharge temperaturewere investigated. In the numerical modelling,the evaporating and condensing temperatures were assumed constant at5oC and 40oC, respectively. The results showed that the COP improvements increased with theincrease in the subcooling. R32 and R290 hadthe lowest and the highest COP improvement when subcoolingwas applied, i.e., 3.3%and 5.3% for subcoolingof 5K and 6.2%and 10.2% for subcoolingof 10K, respectively. Due to low global warming potential and almost identical refrigerant propertiesascompared to R22, system with LSHX and R290 has huge commercial potential as a replacement for conventional system inthefuture.