Study on performance of solar energy interseasonal heat storage ground source heat pump system in cold region

Abstract

In order to solve the problem of soil heat imbalance caused by winter heat load much higher than summer cooling load in severe cold areas of China, TRNSYS simulation software was used to analyze the performance of solar energy interseasonal regenerative ground source heat pump system in a hospital in Baotou City. The results show that COP and EER of the two heat pump units have little difference on a typical day, and the heating and cooling effect of the heat pump is relatively stable. Within ten years of operation of the inter-seasonal heat storage system, the soil temperature increased from 10℃ to 10.68℃, and the soil temperature of the solar-ground source heat pump composite system decreased to 5.62℃. At this time, the COP of interseasonal heat storage model was 3.25, up 2.2% year-on-year. It can be concluded that the solar energy cross-season heat storage mode can effectively alleviate the soil heat imbalance and improve the heat performance coefficient of the heat pump.