严寒地区太阳能-地埋管地源热泵系统耦合性能研究
Coupling performance of solar-ground source heat pump systems in severe cold zone
摘要：
为解决严寒地区采用地埋管地源热泵系统供暖引起的土壤热失衡问题，以太阳能辅助地埋管地源热泵耦合系统为研究对象，分析了地埋管换热器供能性能、系统运行1 a和10 a后的土壤温度变化特性及土壤初始温度与集热器面积的关系，拟合得到了土壤初始温度与单位建筑面积下最优集热器面积的数学表达式，采用费用年值法对该耦合系统与常规燃煤锅炉供暖系统进行了经济性比较分析。结果表明：在冬季利用该耦合系统供暖且采用蓄热水箱出口与地埋管出口温差为10 ℃控制太阳能集热系统辅助供暖的方案，耦合系统运行1 a后，土壤平均温度升高0.09 ℃，土壤 热平衡率为101%；10 a后土壤平均温度升高0.35 ℃，土壤热平衡率为104%；该耦合系统供暖经济性优于传统燃煤锅炉供暖系统。
Abstract：
In order to solve the problem of soil heat imbalance caused by ground source heat pump system heating in severe cold zone, taking the solar-assisted ground source heat pump coupling system as the research object, analyses the energy supply performance of ground heat exchangers, the soil temperature variation characteristics after the system operating for one year and ten years respectively, and the relationship between the initial soil temperature and the collector area. Obtains the mathematical expression of the initial soil temperature and the optimal collector area per unit building area by fitting. Uses the annual cost method to compare the economy between the coupling system and the conventional coal-fired boiler heating system. The results show that when the coupling system is used for heating in winter and the temperature difference between the outlet of the hot water storage tank and the buried pipe is 10 ℃ to control the solar heating system for auxiliary heating, the average soil temperature increases by 0.09 ℃ and the soil heat balance rate is 101% after one year operation, and the average soil temperature increases by 0.35 ℃ and the soil heat balance rate is 104% after ten-year operation. The heating economy of the coupling system is better than that of the conventional coal-fired boiler heating system.
Keywords:solar-groundsourceheatpump,severecoldzone,initialsoiltemperature,collectorarea,soilheatbalancerate