土壤源热泵系统间歇性运行的必要性分析.pdf

土壤源热泵系统间歇性运行的必要性分析 1* 1 2 张 峰 杨标 王华 （1．上海理工大学能源与动力工程学院 上海 200093） （2．上海绿宛环境设备有限公司 上海 200070） 摘 要：本文基于上海某工程实例，对长时间（≥10h ）稳定运行的土壤源热泵中央空调系统 单U型地埋管换热器表面的土壤温度场、管群内土壤温度场、管群外土壤温度场变化进行全年 测试，并对三种测试数据做了对比分析。测试结果表明：管群外浅层土壤（深度≤20m ）温度 一年四季变化波动比较大，且地下浅层土壤温度出现最高月份相比于地上环境出现最高温度 的月份存在一定的延迟性；管群内的土壤温度会随着系统的长时间稳定运行呈现升高趋势 ， 使地埋管换热器表面与周围土壤之间换热温差减小，导致换热效率下降。通过数据对比分析 发现，系统的长时间稳定运行对地埋管与土壤之间换热造成的影响夏季明显高于冬季。研究 结果表明, 适当增加钻孔间距、对地源热泵系统采取间歇性运行的模式(尤其在夏季)对加强地 埋管换热器与土壤之间的换热至关重要。 关键词：土壤源热泵 单U 型地埋管换热器 换热效率 间歇性运行 Analysis of Necessity for Ground Source Heat Pump Intermittent Operation *1 1 2 Zhang Feng Yang Biao Wang Hua (1.College of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China; 2. Shanghai GreenOne Environmental Equipment Co.Ltd, Shanghai, 200070, China) Abstract: Based on an engineering case in shanghai, this paper will give a yearly test on single U-shaped ground heat exchanger of ground-source heat pump in central air conditioning system, and analyzes the change of surface ground temperature field, inner ground temperature field and outer ground temperature field of the pipes. The test results show that: throughout the year , temperature fluctuations change is larger in the shallow soil (more than 20m depth ）which is outside the tube group , and time of the highest temperature of the shallow soil appears later than that on the ground . In the inside tube group, the soil temperature will increase along with the system’s continuous and steady operation. Thus, it makes the temperature difference smaller between the surface of the * 张峰 （1987.09- ）男 上海理工大学 硕士 研究方向为 CO2 热泵热水器气冷器