Energy efficiency analysis of high temperature heat pump system for low grade waste heat recovery
In view of the fact that there are many low-grade hot water in smelters in the mining industry,such as cooling circulating water of equipment and underground water inflow in mines,in this study,the single-stage and two-stage vapor compression heat pump systems for waste heat recovery is compared,and a calculation model of the thermal performance of the system is developed.Then the energy efficiency of the two systems is compared.The results show that the performance of the two-stage vapor compression heat pump system(TS)is better than that of the single-stage vapor compression heat pump system(SS).When the hot water inlet temperature is 85℃ and the outlet temperature is 115℃,the COP of the TS system is increased by 22.60%compared with the SS system when the hot water inlet temperature is 85℃ and the outlet temperature is 115℃,and the COP of the TS system is increased by 21.07%compared with the SS system when the isentropic efficiency is 0.7.
smelterswaste heat recoveryvapor compressionhigh temperature heat pumpenergy efficiencytwo-stage compression
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