Numerical simulation of flow and heat transfer in evaporator with active defrosting and enhancement of low temperature hot water
In view of the defects of the air source heat pump operating at low temperature,an air source heat pump with active frost suppression and efficiency improvement was designed with the addition of hot return water pipe on the windward side of the evaporator.Taking the evaporator components in the system as the research object,the effects of tube spacing,fin spacing,tube type and row number on the air side performance of the common tubular finned evaporator and the proposed new evaporator were compared and analyzed by numerical simulation software Fluent.The results show that in the simulated basin,the whole temperature of the new evaporator increases,the flow resistance does not change,and the outlet temperature is at least 2℃higher than that of the ordinary evaporator.After considering the influence of pipe spacing,fin spacing,pipe type and pipe row number,small pipe spacing,fin spacing of 1.5mm,front elliptic and back circular pipe type combination multi-row pipe can be selected.
国家科技期刊平台
NSTL
万方数据
维普
