不同地区土壤温度及建筑负荷特性对地源热泵系统的影响

本文以我国不同地区的地源热泵为研究对象,首先对地埋管系统建立了CFD模型,根据各地区的土壤初始温度和热物性进行模拟计算,讨论了几种工况下土壤换热能力及地埋管进、出口温差的变化。而后对某办公建筑匹配不同地区的围护结构参数,利用DeST软件进行模拟计算,得出了各典型城市建筑负荷特性,进一步分析了建筑负荷对地源热泵系统的影响。分析可知无论是从热泵机组效率角度考虑,还是从土壤热平衡角度考虑,低纬度地区均不宜单独使用地源热泵系统进行空调和采暖,应考虑采用辅助冷热源,构建复合型采暖空调系统。

Influences of Different Soil Temperatures and Building Load Characteristics on Ground Source Heat Pump System

Based on the CFD model of ground source heat pump in different areas in China and according to the soil initial temperature and thermal properties,soil heat exchange capacities and inlet and outlet temperature differences of buried pipe under different conditions were discussed.And then,with the envelope parameters,the cooling /heating loads of an office building were simulated with the software of DeST.Furthermore,the influences of building load characteristics on ground source heat pump system were analyzed.As a result,considering of the efficiency of heat pump and soil heat balance,the heating and air-conditioning system in low latitude areas should not only depend on the ground source heat pump,auxiliary cold /heat source should be adopted.