基于TRNSYS的太阳能-土壤源热泵联合供暖系统特性分析

Characteristic analysis of combined heating system of solar-soil source heat pump based on TRNSYS

选取兰州地区某住宅楼为供暖对象,采用太阳能-土壤源热泵联合供暖,在保障土壤热平衡以及负荷峰值时刻充足供热的前提下降低地埋管数量和投资成本。并在此基础上利用TRNSYS软件构建系统瞬时模型,以集热水箱设定水温T为研究变量,对系统特性进行分析。结果表明:减小温度T使太阳能集热量得到更充分地利用,同时提高了太阳能保证率,且温度T越小作用越明显;减小温度T同时也减少了采暖期土壤取热量和非采暖期用于土壤补热的运行能耗;当温度T在5~17℃范围内时,热泵机组的COP和耗电量呈现出一定的规律性,且当温度T=5℃时,节能效果较好。

A residential building in Lanzhou was selected as the heating object and a combined heating system of solar-soil source heat pump was used for heating in order to ensure soil thermal balance and sufficient heating at peak load time,the number of buried pipes and investment cost should be reduced.On this basis,a transient system model was constructed using TRNSYS software.The temperature T(water temperature of solar collector water tank)is taken as the research variable,and the characteristics of the system are analyzed.The results show that:reducing the temperature T can make the solar heat collection more fully utilized,and can improve the solar energy guarantee rate,and the smaller the temperature T,the more obvious the effect is;the reduction of temperature T reduces the energy consumption of soil heating in heating period and the operation energy consumption for soil heating supplement in non heating period;when the temperature T is within the range of 5~17℃,the COP and power consumption of the heat pump unit show a certain regularity,and when the temperature of T is 5℃,the energy saving effect is better.