Impact of Seasonal Heat Accumulation on Operation of Geothermal Heat Pump System with Vertical Ground Heat Exchanger

[摘要] The subject of the investigation was to find out the influence of heat pump operation in summer on its function in winter. For this purpose a mathematical model of a ground coupled heat pump system has been developed and programmed. The mathematical model of a system ground heat exchanger uses the finite difference method to describe the heat transfer in soil and the analytical method to specify the heat transfer in the U-tubes heat exchanger. The thermal diffusivity by the heat transfer in the soil changes during gradual freezing of the pore moisture and thus slows soil freezing. The mathematical model of a heat pump includes the description of a scroll compressor and the simplified descriptions of the evaporator and condenser. The analysis showed that heating during the cold season and cooling in the warm season affect the average heat transfer medium temperature in the soil loop in the winter season. It has been also showed that the degree of this effect depends on the clay content in the soil.

[发布机构] Department of Heating and Ventilation, National Research Institute Moscow State, University of Civil Engineering, Jaroslavskoe Shosse, 26, Moscow; 129337, Russia^1

[学科分类] 土木及结构工程学

[关键词] Analytical method;Average heat transfers;Evaporator and condensers;Ground heat exchangers;Ground-coupled heat pump systems;Heat accumulation;Medium temperature;Vertical ground heat exchangers