Research on renewable energy coupling system based on medium-deep ground temperature attenuation

作者：Jianwei Li, Lingling Bao, Guoqing Niu, Zhuang Miao, Xiaokai Guo, Weilian Wang · 发表于：Applied Energy · 年份：2023 · DOI：10.1016/j.apenergy.2023.122187 · 被引用次数：35 · 研究领域：Geothermal Energy Systems and Applications、Solar Energy Systems and Technologies、Building Energy and Comfort Optimization

Medium-deep geothermal has large reserves, a high temperature, a high heat flow density , and other characteristics, but the traditional medium-deep ground heat pump system have long relied on heating from the ground, and soil temperature decreases annually. Using a community building heating system as an example, from a point of view of heat accumulation or not, this article examines the design of a photovoltaic photothermal coupled medium-deep ground source heat pump system (PV/T-GSHP) and a photovoltaic-assisted medium-deep ground source heat pump coupled air source heat pump system (PVGSHP-ASHP). First, the operational performance of a typical GSHP system was compared to that of the PV/T-GSHP and PVGSHP-ASHP systems, both of which were built using TRNSYS. Second, the energy balance and electrical consumption of each system were compared. Finally, the effect of the PV/T-GSHP system’s key parameters and the different ASHP load ratios in the PVGSHP-ASHP system on soil temperature were analyzed. The results showed that after 20 years of operation, the average soil temperature decreased from 38.29 °C to 36.89 °C for the GSHP system, resulting in a decrease in the performance coefficient of the ground source heat pump and the system performance coefficient. The PV/T-GSHP system can address the issue of declining soil temperature with an increase in soil temperature of 0.09 °C. The PVGSHP-ASHP system can mitigate the issue of decreasing soil temperature. The PVGSHP-ASHP system i...