基于TRNSYS的中深层土壤源供暖系统运行特性分析

Analysis on the operation characteristics of middle-deep soil source heating system based on TRNSYS

本文针对长春地区某居住建筑,利用TRNSYS软件建立中深层地埋管土壤源热泵系统仿真模型,模拟分析了热泵机组性能系数(简称COP)随地埋管深度和运行年数的变化趋势及岩土导热系数对地埋管出水温度的影响。结果表明,地埋管深度越深,COP随运行年数变化越小,系统运行越趋于稳定。当地埋管深度达到1800 m时,系统运行趋于稳定。在运行初始阶段,地埋管出水温度变化幅度较大。当运行达到750 h时,地埋管出水温度趋于稳定;当热储层岩体导热系数增加2 W/(m·℃),载热流体出口温度由34.1℃增至36.9℃,增加了8.21%,由此可见岩体导热系数对地埋管出水温度的影响显著。

Based on TRNSYS software,this paper established a simulation model of the medium and deep underground heat exchanger coupled with the ground heat pump system,and simulated and analyzed the COP variation trend of the heat pump unit and the influence of the thermal conductivity of rock and soil on the outlet water temperature of the buried pipe.The results show that the deeper the buried pipe depth,the smaller the change of the unit COP and the more stable the system operation.When the buried pipe depth reaches 1800 m,the system becomes stable.In the initial phase of operation,the temperature of the buried pipe outlet changes greatly.When the operation reaches 750 h,the outlet temperature of the buried pipe tends to be stable.The outlet temperature increases from 34.1℃to 36.9℃with an increase of 5.8%for 2 W/(m·℃)increase of thermal conductivity of rock mass.It can be seen that the thermal conductivity of rock mass has a significant effect on the effluent temperature of buried pipe.