基于TRNSYS的土壤源热泵热平衡问题的影响因素分析

夏热冬冷这种冷负荷占优地区,若由土壤源热泵系统承担所有的空调负荷,则会造成全年土壤取放热量的不平衡,从而出现常年运行后土壤温度的逐渐上升,降低系统夏季的运行效率,不利于系统持续稳定高效的运行。为此首先利用模拟软件TRNSYS搭建土壤源热泵系统模型,对土壤源热泵系统长期运行性能进行模拟分析,从冬夏累计负荷比、埋管间距、埋管深度、土壤导热系数、回填料导热系数这几个影响因素出发,研究土壤源热泵长期运行的热平衡问题,以期对土壤源热泵系统的合理应用和发展提供支持。

Impacting Factor on Ground Heat Balance of GSHP System Using TRNSYS

In the cooling load dominated area of hot summer and cold winter zone,when the ground source heat pump（GSHP） system is responsible for all of the air conditioning load,in most cases,the heat taken and released to the soil is uneven,and it would result in soil temperature rise after period running,which is harmful to continuous and stable operation of the system.The GSHP system is modeled by TRNSYS firstly and then the performance of it in long-run is analyzed.The heat balance problem of GSHP system in long-term operation is discussed from such aspects as,heat balance,GHP spacing,GHP depth,soil thermal conductivity,backfill materials＇ thermal conductivity.The work is helpful to the reasonable application and development of GCHP.