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在北方寒冷地区的冬季,利用地源热泵机组(Ground Source Heat Pump Unit,GSHPU)为建筑物进行供暖是一种新型节能减排模式。由于在采暖期间从土壤中吸收了较多的热量,超过了土壤本身的热修复能力,会造成GSHPU的地埋管所在区域的土壤热稳定性能发生变化,使得其COP值下降,运行功耗增加。针对此问题,提出了太阳能-地源热泵联合供暖系统。该系统在冬季以太阳能热水系统(Solar Water Heating System,SWHS)的运行作为主要供热模式,GSHPU的间歇运行作为辅助供热模式,从而充分利用太阳能并解决阴天等气象因素所带来的集热量不足、供水温度低等的问题。在非供暖季期间,GSHPU停运,而SWHS通过热水循环,对GSHPU地埋管所在的土壤区域进行热量回补,使得土壤温度场稳定,从而确保GSHPU在冬季间歇运行时的高效性。以兰州地区某办公楼的太阳能-地源热泵联合供暖系统作为案例,基于TRNSYS软件,进行数值模拟和分析,验证了该系统的可行性,且节能效果明显。
In winter in the northern cold area, heating the building with Ground Source Heat Pump Unit (GSHPU) is a new type of energy saving and emission reduction mode. Due to the fact that more heat is absorbed from the soil during heating, which exceeds the heat-repair capacity of the soil itself, soil thermal stability in the area where the buried pipe of GSHPU is located will change, causing the COP value to decrease and the operating power consumption to increase . In response to this problem, proposed solar - ground source heat pump combined heating system. The system operates in winter with the Solar Water Heating System (SWHS) as the main heating mode and the GSHPU intermittent operation as the auxiliary heating mode to fully utilize the solar energy and solve the weather and other meteorological factors Insufficient heat collection, low water temperature and other issues. During the non-heating season, the GSHPU is decommissioned. The SWHS, through hot water circulation, heats up the soil area where the GSHPU buried pipe is located, stabilizing the soil temperature field and ensuring the high efficiency of the GSHPU in intermittent winter operation. Taking a solar energy - ground source heat pump combined heating system of an office building in Lanzhou as an example, the numerical simulation and analysis based on TRNSYS software have verified the feasibility of the system and obvious energy saving effect.