Experimental investigation on hot water heat pump using new refrigeration R32 in climated conditions of Ho Chi Minh city

Abstract

This paper presents the results of experimental investigation on the hot water heat pump (HPHW) using new refrigerant R32 in the climated condition of Ho Chi Minh City (HCMC). The HPHW was installed in the HCMC University of Technology and Education. This system has a compressor capacity of 1 Hp, using a new refrigerant R32 and the required temperature of hot water is 50 oC. The effect of Ho Chi Minh City’s climated conditions on the coefficient of performance (COP), such as condensate pressure, evaporation pressure, etc. of the HPHW pump are studied and evaluated. The experiments are carried out under the ambient temperature ranging from 29 oC to 34 oC, the initial water temperature into the condenser ranging from 23 oC to 35 oC, while the water flow rate into the condenser ranges from 2 l/min to 3,2 l/min. The experimental results show that the maximum water flow rate through the condenser of heat pump to meet the required hot water temperature of 50 oC is defined as 2,3 liters/minute for compressor with a capacity of 1 Hp, the value of the COP of hot water heat pump using new refrigerant R32 obtained ranges from 4,12 to 4,62.