基于TRNSYS的严寒地区土壤源热泵系统性能研究

Research on performance of ground source heat pump system in severe cold region based on TRNSYS

研究严寒地区土壤源热泵系统的运行特性,旨在提高土壤源热泵系统运行效率,保证土壤源热泵系统持续高效稳定的运行。利用TRNSYS软件搭建土壤源热泵系统模型,对土壤源热泵系统进行了30年的运行分析,分析影响系统热平衡的主要因素,并研究埋管间距、埋管深度等因素对土壤温度变化的影响。结果表明,在严寒地区,建筑累计负荷是影响系统热平衡的主要因素,当建筑累计热负荷与建筑累计冷负荷达到一定比值时,系统将达到热平衡状态。钻孔间距、钻孔深度对土壤温度变化有一定影响,增大钻孔间距、增加钻孔深度可以减少土壤温度变化幅度。

This paper mainly studies the operation characteristics of ground source heat pump system in severe cold area, improves the operation efficiency of ground source heat pump system, and ensures the ground source heat pump system continues to operate efficiently and stably. Use TRNSYS to build the model of ground source heat pump system, the ground source heat pump system was analyzed for 30 years, analyze the main factors affecting the heat balance of the system, and study the effects of borehole spacing and borehole depth on soil temperature change. The results show that in the severe cold region, the cumulative load of the building is the main factor affecting the thermal balance of the system. When the accumulated thermal load and the accumulated cooling load of the building reach to a certain ratio, the system will reach the thermal equilibrium state. Borehole spacing and borehole depth have certain influence on soil temperature change. Increasing the borehole spacing and the borehole depth can reduce the variation of soil temperature.