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通过TRNSYS软件建立地源热泵系统仿真模型,在综合考虑不同钻孔深度下的钻孔数量、单孔流量及建筑物逐时负荷的基础上,对比分析不同钻孔深度下,系统运行能耗、地埋管换热器初投资及占地面积。研究表明,钻孔深度低于300 m时,钻孔数量随钻孔深度的增加而明显减小,高于300 m时,钻孔数量基本不变;长期运行,土壤温度随钻孔深度的增加而先增后减;地埋管换热器初投资随钻孔深度的增加而增加;钻孔深度100 m时系统冬夏季运行能耗最低,总运行能耗最低,故可优先选择钻孔深度为100 m,当地表面积有限时,可选择钻孔深度为150 m甚至是200 m;将系统运行能耗、地埋管换热器初投资占地面积与钻孔深度间的关系拟合为公式,并提出确定钻孔深度的方法。
The ground source heat pump system simulation model was established by TRNSYS software. Based on the consideration of the number of boreholes, the flow rate of single hole and the hourly load of buildings under different drilling depths, the energy consumption, Ground tube heat exchanger initial investment and covers an area. The results show that when the drilling depth is less than 300 m, the number of boreholes obviously decreases with the increase of the drilling depth. When the drilling depth is higher than 300 m, the number of drilling holes is basically unchanged. When the soil depth is long While the first increase and then decrease; the initial investment of ground tube heat exchanger increases with the increase of the drilling depth; the system has the lowest operating energy consumption in winter and summer and the lowest total energy consumption when the drilling depth is 100 m, so drilling depth Is 100 m. When the local surface area is limited, the drilling depth can be chosen to be 150 m or even 200 m. The relationship between system operating energy consumption and ground floor heat exchanger initial investment area and drilling depth is fitted to the formula , And proposed to determine the depth of drilling method.