地下水源热泵变流量运行方式区域适宜性

从地下水源热泵运行＂安全性＂角度出发,对3个不同气候区典型城市的办公建筑采用地下水源热泵变流量运行方式对含水层参数变化特性的影响进行研究.采用数值模拟研究方法对地下水源热泵在不同运行方式下取水系统井壁处孔隙率和渗透系数的变化特性进行研究,对地下水源热泵运行方式的区域适宜性进行了分析.研究结果表明：在寒冷地区、严寒地区和夏热冬冷地区分别采用地下水源热泵变流量运行方式运行5 a后对含水层孔隙率的影响程度与定流量运行方式相比分别减少了45%,48%和44%,对渗透系数的影响程度分别减少了48%,51%和46%;在考虑气候区对建筑负荷特性影响时,地下水源热泵采用变流量运行方式的区域适宜性由高到低分别为严寒地区、寒冷地区和夏热冬冷地区.

Suitability of groundwater source heat pump variable flow operation mode for climate zone

For operation safety point of view, the influence of ground water source heat pump （ GW- SHP） variable flow operation mode on characteristics of aquifer hydraulic parameters was investigated for the office buildings in the typical cities in different climate zones. The variation characteristics of porosity and permeability coefficient of borehole wall were identified by means of numerical simulation method under various operation modes of GWSHP pumping system ; consequently the suitability of GWSHP operation mode for climate zone was analyzed. It was presented that the porosity of borehole wall was decreased by 45% , 48% and 44% , the permeability coefficient was reduced by 48% , 51% and 46%, respectively, in cold, severe cold, hot summer and cold winter zones under variable flow operation mode after running for five years compared with constant flow operation mode. After taking the effect of climate zone on characteristics of air conditioning load into account, the GWSHP variable operation mode is most suitable for severe cold zone, more suitable for cold zone, but less suitable for hot summer and cold winter zone.