流体机械

2020, v.48;No.576(06) 77-83

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寒冷地区地埋管周围土壤冻结传热特性试验研究
Experimental Research on Frozen Soil Heat Transfer Characteristics of Ground Heat Exchanger in Cold Climate

霍伟业;周亚素;郑紫豪;朱飞宇;
Huo Weiye;Zhou Yasu;Zheng Zihao;Zhu Feiyu;College of Environmental and Engineering,Donghua University;

摘要(Abstract):

寒冷地区土壤初始温度较低,且冬季热负荷大,因此地埋管入口流体温度较低,当温度低于0 ℃时周围土壤会出现冻结现象并影响传热。本文通过搭建沙箱试验平台模拟地埋管低温取热过程,采用控制变量法研究入口流体温度对地埋管周围土壤冻结传热的影响。试验结果表明:随着入口流体温度的降低,土壤温度降低,冻结层厚度增大,土壤发生冻结的时间减小,但随着流体温度的降低,冻结层厚度的增加量和土壤温度的降低量逐渐减小。此外不同入口流体温度下的冻结层厚度在埋深方向均随深度增加而逐渐减弱。随着入口流体温度的降低,冻结层厚度从入口至出口处的变化逐渐变缓,说明入口流体温度越低,埋管周围土壤冻结在埋深方向的影响越大。相关结论可为寒冷地区地埋管的设计提供理论支持。
In cold region,the initial temperature of the soil is low,and the thermal load in winter is large.Therefore,the inlet fluid temperature of ground heat exchanger is relatively low.When the temperature is below 0 ℃,the surrounding soil will freeze and affect heat transfer.In this paper,a sandbox experimental platform was built to simulate the low-temperature heat taking process of ground heat exchanger,and the influence of inlet fluid temperature on frozen soil heat transfer around ground heat exchanger was studied by the control variable method.The experimental results show that as the inlet fluid temperature decreases,the soil temperature decreases,the frozen layer thickness increases,and the soil freezing time decreases.However,as the fluid temperature decreases,the increment in the frozen layer thickness and the reduction in the soil temperature gradually decrease.In addition,the frozen layer thickness at different inlet fluid temperatures gradually decreases with increasing depth in the depth direction.As the inlet fluid temperature decreases,the variation of frozen layer thickness from inlet to outlet is getting slower,indicating that the lower the inlet fluid temperature,the greater the effect of soil freezing around the ground heat exchanger in the depth direction.The relevant conclusions can provide theoretical support for the design and operation of ground heat exchangers in cold region.

关键词(KeyWords): 地埋管换热;入口流体温度;冻结层厚度;土壤温度
ground heat exchanger;inlet fluid temperature;frozen layer thickness;soil temperature

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作者(Author): 霍伟业;周亚素;郑紫豪;朱飞宇;
Huo Weiye;Zhou Yasu;Zheng Zihao;Zhu Feiyu;College of Environmental and Engineering,Donghua University;

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