基于PVT集热/蒸发器的补气增焓热泵性能分析

PERFORMANCE ANALYSIS OF VAPOR-INJECTION HEAT PUMP BASED ON PVT COLLECTOR/EVAPORATOR

传统直膨式太阳能辅助热泵系统在低温环境适应性欠佳,影响其在寒冷地区使用,通过采用补气增焓技术可以有效提高其低温条件下的供热能力。以所提出的采用PVT集热/蒸发器的补气增焓热泵系统为研究对象,计算分析环境条件、太阳辐射强度、注入蒸汽质量流量对该热泵系统性能的影响。研究结果表明:当环境温度为-10℃,太阳照强度为500 W/m时,性能系数(COP)可达4.3,比使用补气增焓(VI)循环的空气源热泵(ASHP)系统高63.6%。以当量热价(LCOH)作为指标与其他3种供热系统进行比较,所提出的系统经济性也具有一定的优势,可为补气增焓热泵系统在寒冷气候地区的应用提供新思路。

Traditional direct expansion solar-assisted heat pump system has poor adaptability in low temperature environment,which affects its use in cold areas.By adopting vapor-injection(VI)technology,it can effectively improve its heating capacity under low temperature conditions.Taking the proposed vapor-injection heat pump system using PVT collector/evaporator as the research object,the effects of environmental conditions,solar irradiance and injected steam mass flow rate on the performance of the heat pump system are simulated and verified by means of model establishment,numerical simulation and experimental research.The simulation results show that the system COP could reach 4.3 which is 63.6%higher than that of the ASHP system with VI cycle when the ambient temperature is-10℃and the solar radiation intensity is 500 W/m~2.Compared with other three heating systems with Levelized Cost of Heat(LCOH)as an indicator,the proposed system economy also has certain advantages,which provides the possibility for the application of steam jet heat pump system in cold area.