基于CFD的太阳能辅助地源热泵系统土壤热环境分析

Analysis on soil thermal environment of solar assisted ground-source heat pump system based on CFD

针对地源热泵长期供暖工况运行引起的土壤冷堆积问题,采用太阳能集热面积与建筑冬季供暖热负荷之比k描述。理论与数值模拟结果表明:系数k可以作为合理选择太阳能集热面积的主要依据之一;给出以太阳能集热作为补热热源、改善土壤热环境的原理方法。以系统一年的补热与无补热运行工况为研究对象,采用CFD数值模拟方法,对太阳能辅助地源热泵联合供暖系统进行土壤热平衡分析。研究结果表明:在非供暖季节采用太阳能集热对土壤补热,是改善土壤热环境品质、提高地源热泵系统性能系数的有效方法之一。

Aimed at the issue of soil cold accumulation caused by long term running under heating mode of ground-source heat pump,the ratio of solar collector area and heating load of building in winter,kis adopted for describing.Theoretical and numerical simulation results show that the coefficient kcan be as one of the main basis for reasonable selection of solar collector area.The principle method that solar collectors are used to reinforce soil heat and improve thermal environment is presented.Taking operation conditions of supplement soil heat or not for one year as research object,the issue of soil thermal balance of solar assisted ground-source heat pump combined heating system is analyzed using CFD simulation method.The study results show that using solar collector to reinforce soil heat in non-heating seasons is an effective method of improving soil thermal environment and raising the COPof ground-source heat pump system.