摘要
《浅层低温能评价规范》对浅层低温能的定义为:地表深度不超过200 m,温度不超过25℃。《地源热泵工程技术规范》也未对利用的钻孔深度做具体要求。根据实际工程经验与计算,常用100~120 m。其影响深度的因素主要有:地层可钻性,如钻孔越深,可钻性差,相对成本提高;管道直径也影响水流阻力,深度较大则驱动水流功耗增大;管道间距的大小对热短路、回填材料热物性参数等产生较大的影响。该文将根据传热基本原理,进行各种影响因素分析,通过建立数值传热模型,求解一定条件下的换热能力,分析各参数之间的关系,以便于工程设计参考,有助于浅层低温能工程推广应用。
Shallow geothermal energy is defined in ＂The Standard for Evaluation of Shallow Geothermal Energy＂ as the heat energy which is ＂contained in the surface depth no more than 200 meters and not exceeds 25℃＂.In addition,there is no specific requirement on the drilling depth in Technical Code for Ground-Source Heat Pump System.According to the actual engineering experience and calculation,100~120 meters has been found in common use.The influencing factors include：the formation drillability,which usually declines as the drilling goes deeper,thus increasing costs;the pipe diameter,which also affects the flow resistance,i.e.the power consumption for driving current increasing along with the increasing depth;the size of the pipe spacing,which has a great influence on the thermal short circuiting;and thermophysical parameters of back-fill materials,etc.Based on the basic principle of heat transfer,this paper analyses various influence factors,and,through establishing numerical heat transfer models,figures out the heat-exchange capability under certain conditions and the relationship between these parameters,to the effect that it can provide a reference for engineering designs and contribute to the？ popularization and application of the shallow geothermal energy engineering.
出处
《山东国土资源》
2017年第10期62-68,共7页
Shandong Land and Resources
基金
基金项目:山东省重点城市浅层地温能评价
关键词
换热孔深度
数值传热模型
流体流量
影响因素
Depth of heat exchange hole
numerical heat transfer models
flow rates
influence factors
