分层渗流土壤能源桩传热特性研究

陈希; 童梦钰; 张正威

doi:10.13204/j.gyjzG21082101

分层渗流土壤能源桩传热特性研究

doi: 10.13204/j.gyjzG21082101

浙江农林大学风景园林与建筑学院, 杭州 311300

基金项目:

浙江省建设厅项目(2017K36)

杭州市建委科研项目(2017K18)

详细信息

作者简介:
陈希,男,1994年出生,硕士研究生

通讯作者:
张正威,男,1964年出生,博士,教授,zwzhang10@126.com。

计量
- 文章访问数: 82
- HTML全文浏览量: 22
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2021-08-21
- 网络出版日期: 2023-02-06

Study on Heat Transfer Characteristics of Energy Piles in Stratified Seepage Soil

College of Landscape Architecture, Zhejiang A&F University, Hangzhou 311300, China

摘要

摘要: 以能源桩为研究对象,结合土壤分层渗流的实际工程地质情况,根据能量守恒原理建立能源桩传热微分方程,采用分离变量和拉普拉斯变换求得了分层渗流土壤能源桩传热的过余温度表达式。通过计算,验证了传热模型的正确性。基于该模型讨论了土壤热物理性质、渗流速度等因素对过余温度分布的影响。结果表明:桩体上、下相邻土层热物理性质变化会对桩顶和桩底范围内的过余温度分布产生影响,且对桩的总换热量有一定影响;渗流会显著影响土层内过余温度的分布,离能源桩中心相同距离处,上游土层过余温度低于下游土层;渗流速度越大,土层内过余温度等温线偏移越显著;热输运效应越明显,能源桩的换热效率越高。
- 分层土壤 /
- 渗流 /
- 能源桩 /
- 计算模型 /
- 传热特性
Abstract: Taking energy piles as the reasearch object, combined with the actual geological layered seepage, the differential equation for heat transfer of energy piles was established according to the principle of energy conservation. The excess temperature equation for heat transfer of energy piles in layered seepage soil was obtained by the method of seperation variables and Laplace Transform. The calculation software was programmed to verify the accuracy of the heat transfer model. Based on the model, the influence for thermophysical properties of soil and seepage velocities on the distribution of excess temperature was discussed. The results showed that changes in thermophysical properties of adjacent soil layers under and below the piles would influence the excess temperature distribution at the top and bottom of the piles, and had a certain impact on the total heat transfer of piles. Seepage had a significant impact on the distribution of excess temperature in stratified soil. At the same distance apart from the centers of energy piles, the excess temperature of the upper-stream was lower than that of the lower-stream in the same soil layer. The higher the seepage velocity, the more significant the isotherm deviation of excess temperature in the soil layer; the more obvious the heat transfer, and the higher the heat exchange efficiency of energy piles.
- layered soil /
- seepage /
- energy pile /
- calculation model /
- heat transfer characteristics

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