摘要
地埋管换热器的换热量随钻孔深度增加呈非线性变化。当钻孔深度达到一定范围后,冬季取热量继续升高,但夏季排热量趋于平缓甚至降低,确定地埋管换热器的最佳深度成为亟待解决的问题。选取我国夏热冬冷地区的南京市、寒冷地区的山东大学和严寒地区的沈阳市共3个典型气候区的代表城市,采用TRNSYS软件模拟计算各地区建筑全年逐时冷热负荷特性,基于建立的物理模型与节点方程对单U型地埋管换热器进行精确求解,并在满足3个典型地区建筑供热制冷需求的前提下,综合考虑换热量、经济性、钻孔壁面土壤温度场等因素,分析不同埋深条件下地埋管换热器的综合性能。结果表明,单U型地埋管换热器的最优埋设深度约为400 m。
The heat exchange capacity of the buried pipe heat exchanger varies nonlinearly with the increase of the drilling depth.When the drilling depth reaches a certain range,the heat extraction in winter continues to increase,but the heat dissipation in summer tends to level off or even decrease.Determining the optimal depth of the buried heat exchanger becomes an urgent problem to be solved.Three representative cities from typical climate zones in China are selected,namely Nanjing City in the hot summer and cold winter area,Jinan City in the cold area and Shenyang City in the severe cold area.The TRNSYS software is used to simulate and calculate the hourly cooling and heating load characteristics of buildings in each region throughout the year.Based on the established physical model and node equation,the single U-shaped buried heat exchanger is accurately solved.Under the premise of meeting the heating and cooling demands of buildings in three typical regions,the comprehensive performance of the buried pipe heat exchanger under different burial depths is analyzed by comprehensively considering factors such as heat exchange capacity,economy,and the soil temperature field on the borehole wall.The results show that the optimal burial depth of the single U-shaped buried heat exchanger is approximately 400 m.
作者
李乾畅
张文科
姚海清
刘霞
张珊珊
LI Qianchang;ZHANG Wenke;YAO Haiqing;LIU Xia;ZHANG Shanshan
出处
《节能》
2025年第9期58-63,共6页
Energy Conservation
基金
山东省自然科学基金项目(项目编号:ZR2022ME079)。
关键词
中浅层
地埋管换热器
最佳深度
换热量
经济性
middle and shallow layer
buried pipe heat exchanger
optimal depth
heat exchange capacity
economy
