复合式地铁源热泵系统适用性研究

Study on the applicability of hybrid metro source heat pump system

地铁源热泵系统在单独运行过程中,由于围岩热物性的影响,会导致隧道内热量供应不足的问题,进而影响地铁源热泵系统长期高效运行,甚至无法保障基本热负荷需求。针对这一现象,以哈尔滨某办公建筑为例,在TRNSYS软件中搭建辅助燃气锅炉的复合式地铁源热泵系统模型,并进行时长五年的运行模拟。结果表明,复合式系统热泵部分的平均全年性能系数(APF)比单一式系统高0.23。单一式系统与复合式系统平均隧道空气温度增长率分别为-1.27%,6.34%。复合式系统的平均单位热量费用年值比单一式系统低0.25元/(kW·h)。复合式系统能够满足供暖季的全部热负荷需求,在性能及经济性方面均优于单一式系统。

The lack of internal heat supply during the stand-alone operation of the subway source heat pump system is due to the influence of the thermo physical properties of the surrounding rock. This will further affect the long-term efficient operation of the subway source heat pump system, and even cannot satisfy the basic heat load demand. Aiming to solve this problem, this study takes an office building in Harbin as an example, builds a combined subway source heat pump system model with auxiliary gas boiler in TRNSYS, and conducts a five-year simulation. The results show that the average APF of the heat pump part of the hybrid system is 0.23 higher than that of the single system. The average tunnel air temperature growth rate of the single system and the hybrid system is-1.27% and 6.34% respectively. The average annual equivalent cost of per unit heat of the hybrid system is 0.25 yuan/(kW·h) lower than that of the single system. The hybrid system can meet all the heat load requirements during the heating season, and is superior to the single system in terms of performance and economy.