太阳能-空气能双源直膨式热泵系统夏季冷热电性能研究

Investigation of the Cooling,Heating,and Electrical Performance of SolarAir Dual-source Direct Expansion Heat Pump System during Summer

本文设计了一种基于微热管阵列的太阳能-空气能双源集热蒸发(冷凝)器及双源直膨式热泵系统,该系统可有效降低光伏组件温度提升光伏发电效率,同时可实现制热和制冷功能,是一种多能互补可满足多种用能需求的新型建筑供能系统形式。搭建了太阳能-空气能双源直膨式热泵系统实验台,并对系统在夏季典型工况下的发电、供冷与提供生活热水性能进行实验测试与分析,结果表明,双源直膨式热泵系统制热运行时,PV/T组件工作对光伏组件起到了显著降温作用,相比于热泵不运行工况,组件光电功率提高56.43%,光电效率提升53.15%;双源直膨式热泵系统将180 L水由20℃加热至50℃的制热过程,系统平均制热COP为4.59,集热功率为3.20 kW,总发电量为1.43 kW·h,总耗电量为1.36 kW·h;由12℃冷却至7℃的制冷过程,系统平均EER为2.29。

A solar air dual-source heat collecting evaporator(condenser)using a micro heat pipe array and a dual-source direct expansion heat pump system was designed.This system effectively reduces the temperature of the photovoltaic module to improve its power conversion efficiency and simultaneously achieves heating and refrigeration functions.The multiple energy complements each other in such an energy system for building applications.An experimental platform for a solar-air energy direct expansion heat pump system was established and the performance of the power generation,cooling supply,and domestic hot water supply was tested and analyzed.When the heating system in the dual-source direct expansion heat pump system operated,the PV/T assembly had a significant cooling effect on the photovoltaic module.Compared to the rest conditions,the photoelectric power and photoelectric efficiency were improved by 56.43%and 53.15%,respectively.During the heating process,the dual-source direct expansion heat pump heated 180 L water from 20℃to 50℃.The average system heating COP,heating power,total power generation,and total power consumption were 4.59,3.20 kW,1.43 kW·h,and 1.36 kW·h,respectively.The average refrigeration EER was 2.29 when cooling from 12℃to 7℃.