太阳能-地源热泵联合供暖系统数值模拟研究

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。

Numerical Simulation on a Combined Solar-Ground Source Heat Pump System

In the cold northern area, people use the Ground Source Heat Pump Unit(GSHPU) to pro-vide heat for buildings in winter. It’s a new type of energy conservation and emission reduction mode. But during the heating period, the absorption of more heat from the soil is in excess of the heat repair capacity of the soil itself, the soil thermal stability region of buried pipes of GSHPU will change. This will make the COP value down and increase power consumption. The GSHPU combined with solar energy heating system has been proposed to solve this problem. The system in winter uses the Solar Water Heating System(SWHS) as the main operation and the intermittent operation of GSHPU as an auxiliary heating mode, we can make full use of solar energy and solve the problems that the bad weather factor brings about insufficient heat supply, low water supply temperature, etc. During the non-heating season, the GSHPU will stop running, the SWHS uses the hot water to heat added of the buried pipe soil region of GSHPU and keeps the stability of soil temperature. This can ensure the efficiency of GSHPU in winter. As a case, we use this system to provide heat to an office building in Lanzhou. This article carries on the numerical simulation and the analysis using the TRNSYS software to the building, verifies the feasibility of the system, and its energy-saving effect is obvious.