套管
板式换热器
传热
材料科学
热交换器
热撒布器
微型热交换器
板翅式换热器
热泵
传热系数
热导率
机械
NTU法
热回收通风
热容率
石油工程
机械工程
地质学
复合材料
工程类
物理
作者
Ke Zhu,Yifan Zeng,Qiang Wu,Ruifeng Wang,Kun Tu,Yu Jun,Xiaoxiu Liu
标识
DOI:10.1016/j.csite.2022.102122
摘要
Ground-source heat pump (GSHP) systems are helpful for reducing building-sector heating and cooling energy consumption. As the core part of the GSHP system, the underground heat exchanger has a large influence on the heat transfer performance (HTP) of the system. The ground temperature variation characteristics of a new efficient coaxial casing heat exchanger (ECCHE) for heat extraction or rejection were investigated. The study was based on dynamic analysis of linear thermostatics used in the thermal response test and the HTP of the ECCHE. The influences of drilled borehole depth, circulation flow rate, and exchanger structure were considered. Results show that the HTP of the ECCHE is 1.61 (1.46) times that of the doublet U-pipe heat exchangers during heat extraction (heat rejection), and the radius thermal influence distance of the ECCHE is > 10 m. The spiral ribs of the ECCHE extended the heat transfer time between the fluid and surrounding rock, and the heat transfer in the upper part of the borehole was greater than that near the deeper part, so it is easy to produce continuous heat or cold accumulation near the borehole tops. Higher thermal conductivity rock, such as gneiss, has shown a faster recovery rate of the ground temperature after heat extraction. This work provides a theoretical basis for the optimization of the design and installation of GSHPs equipped with ECCHEs.
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