论文部分内容阅读
《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。
The definition of superficial low temperature energy is defined as: “the surface depth does not exceed 200 m and the temperature does not exceed 25 ° C. ”Ground source heat pump engineering norms" nor the use of drilling depth to do specific requirements. According to the actual engineering experience and calculation, commonly used 100 ~ 120 m. The main factors affecting the depth are: formation drillability, such as deeper drilling, drillability is poor, the relative cost increases; pipe diameter also affects the flow resistance, the depth of larger drive power flow increases; the size of the pipeline spacing on the Thermal short circuit, thermal properties of backfill materials have a greater impact. According to the basic principle of heat transfer, various influencing factors are analyzed. The numerical heat transfer model is established to solve the heat exchange capacity under certain conditions. The relationship between the parameters is analyzed to facilitate the engineering design reference, Layered low-temperature engineering application.