忽略回填料与岩土热物性差异对桩基埋管换热计算的影响
Heat transfer calculation influence of pile geothermal ground exchanger ignoring the thermal property difference between grout and soil
黄光勤 1卢军 2杨小凤1
作者信息
- 1. 后勤工程学院国防建筑规划与环境工程系，重庆401331
- 2. 重庆大学城市建设与环境工程学院，重庆400045
- 折叠
摘要
桩基埋管换热器具有桩径大、埋深浅的特点，适用于桩基埋管特点的系列导热解析解模型被不断提出，但是该类模型均忽略了回填料与岩土热物性的差异。对于桩径较大的桩基埋管而言，较大的热物性差异将引起较大的计算误差。建立了区别回填料与岩土热物性差异的导热数值解模型，对比分析忽略热物性差异对桩基埋管换热计算的影响，研究表明：导热系数差异对桩基埋管长时间运行的换热热阻计算影响甚小；容积比热差异将引起桩基埋管较大的设计容量误差；桩径越大，热物性差异引起的计算误差越显著。
Abstract
Pile geothermal heat exchanger is characterized by bigger pile diameter and shallow buried depth , and current studies presented the analytical solution models only considering soil conduction ignoring the thermal property difference between grout and soil which would induce the calculation error for big pile diameter .A conduction numerical solution model considering the thermal property difference was developed to analyze the heat transfer influence of pile geothermal heat exchanger induced by thermal parameter difference .Results showed that conductivity difference had little impact on the heat transfer when the operation time was long and the difference of specific heat would induce big error of the ground heat exchanger design capacity and the bigger the pile diameter was ,the more obvious the calculation error .
关键词
地源热泵/桩基埋管/热物性/传热模型Key words
ground source heat pump/pile geothermal heat exchanger/thermal property/heat transfer model引用本文复制引用
出版年
2015
NETL
NSTL
维普
万方数据