Experimental study on soil temperature field of earth-air heat exchanger in solar greenhouse

被引：0

作者：

Li J. ^{[1
]}

Du Z. ^{[1
]}

Tian H. ^{[2
]}

机构：

[1] College of Civil Engineering, Taiyuan University of Technology, Taiyuan

[2] Gas Planning and Design Institute of Shanxi Province, Taiyuan

来源：

Taiyangneng Xuebao/Acta Energiae Solaris Sinica | 2021年 / 42卷 / 12期

关键词：

Geothermal energy; Heat exchanger; Soil testing; Temperature field; Thermal disturbance radius;

D O I：

10.19912/j.0254-0096.tynxb.2019-1357

中图分类号：

学科分类号：

摘要：

In order to study the variation law of the soil temperature field around the pipeline of the earth-air heat exchanger(EAHE) with air temperature and flow rate in the pipeline, the soil temperature field around the pipeline was tested for an actual solar greenhouse in Taiyuan. Results show that the heat transfer from air in pipe to soil, the temperature amplitude and heat affected zone of soil increase with the air velocity changing from 0.5 m/s to 4.5 m/s. When the temperature of inlet air changes in a daily cycle, the soil changes in a same period. But the response of soil temperature had attenuation and delay in different degree for different distance from the soil to pipeline center. The thermal disturbance radius in the soil is less than 0.5 m for the periodic heat flux. The soil temperature fluctuations in horizontal and vertical directions were similar but with some differences in terms of decay rate and time lag. © 2021, Solar Energy Periodical Office Co., Ltd. All right reserved.

引用

页码：375 / 380

页数：5

共 17 条

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