基于相变蓄热器的太阳能-地源热泵系统运行策略分析

Operation strategy of solar-ground source heat pump system based on phase change regenerator

以寒冷地区北京某办公建筑为研究对象,利用TRNSYS建立基于相变蓄热器的太阳能-地源热泵系统模型。针对低谷电驱动下的系统运行策略进行优化研究;分析相变蓄热器对系统供暖性能的影响;确定相变蓄热器的蓄热利用率。结果表明,系统最佳运行策略为:在供暖初、末期,利用太阳能集热器供暖的同时相变蓄热器蓄热;在供暖中期,地源热泵利用低谷电为相变蓄热器蓄热,由相变蓄热器对建筑进行供暖。在整个供暖季中,系统配备13台相变蓄热器进行供暖时,相变蓄热器的蓄热利用率达到87%,能够满足整个建筑的供暖需求。

Taking an office building in cold area(Beijing) as the research object, a solar-ground source heat pump(SGSHP) system model based on phase change regenerator is established by using TRNSYS software. The operation strategy of the system driven by off-peak electricity is optimized. The influence of phase change regenerator on the heating performance of system is analyzed;and the utilization rate of phase change regenerator is determined. The results show that the best operation strategy for the system is to heat the solar collectors at the beginning and end of the heating period while storing heat for the phase change regenerator;in the middle of the heating period, the GSHP uses off-peak electricity to store heat for the phase change regenerator, which supplies heating for the building. Throughout the heating season, when the system is equipped with 13 phase change regenerators for heating, the heat storage utilization rate of phase change regenerator reaches 87%, which can meet the heating needs of the entire building.