地下U 形埋管传热及土壤温度分布研究
杨小平^1，2，邓国兰¹，张境昌²
（1.东莞理工学院化学工程与能源技术学院，广东 东莞 523000；2.广东省分布式能源系统重点实验室，广东 东莞 523000）
摘要： 对地源热泵系统核心组成部分的地下U 形埋管的传热性能进行了深入研究。首先建立了真实的地下U 形埋管
换热器的模型，然后对地下U形埋管换热器在不同工况下的运行进行了模拟计算。重点研究了U 形埋管入口水温、水流
速度和回填土导热系数对U 形埋管传热和土壤温度分布的影响。结果表明：最佳水流速度应为0.6 ～0.8 m/s；最佳回填
土导热系数应比土壤导热系数大，且小于土壤导热系数的2 倍；U 形埋管组最佳管间距应保持在6 m 左右；增大入口水
温、水流速度及回填土导热系数都会使土壤温度有所升高。
关键词： 地源热泵；U 形埋管换热器；数值模拟；温度分布
中图分类号： TU83      文献标志码： A      文章编号： 2095-0802-(2023)09-0020-03
Heat Transfer and Soil Temperature Distribution of Underground U-shaped
Buried Pipes
YANG Xiaoping^1,2, DENG Guolan¹, ZHANG Jingchang²
(1. School of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan 523000,
Guangdong, China; 2. Guangdong Provincial Key Lab of Distributed Energy System, Dongguan 523000, Guangdong, China)
Abstract: This paper conducted in-depth research on the heat transfer performance of underground U-shaped buried pipes,
which are the core components of ground source heat pump systems. Firstly, a real model of underground U-shaped buried pipe
heat exchanger was established, and then simulation calculations were conducted on the operation of the underground U-shaped
buried pipe heat exchanger under different operating conditions. The study focused on the effects of inlet water temperature, water
flow velocity, and heat conductivity coefficient of backfill soil on the heat transfer and soil temperature distribution of U-shaped
buried pipes. The results indicated that the optimal water flow velocity should be 0.6 - 0.8 m/s; the optimal heat conductivity
coefficient of backfill soil should be greater than the heat conductivity coefficient of soil and less than twice of the heat
conductivity coefficient of soil; the optimal spacing between U-shaped buried pipes should be maintained around 6 m; increasing
the inlet water temperature, water flow velocity and heat conductivity coefficient of the backfill soil will all cause an increase in
soil temperature.

Key words: ground source heat pump; U-shaped buried pipe heat exchanger; numerical simulation; temperature distribution