摘要
结合实际工程,采用实验方法研究桩基螺旋地埋管换热器运行阶段周围土壤温度的变化,以及换热性能的影响因素。运行期间,深度越大土壤温度越高,随着换热时间的延长,接近地面的土壤温度增速明显高于深度更大的土壤。与单组螺旋地埋管运行相比,三组螺旋地埋管运行对土壤温升作用明显。对于单组螺旋地埋管换热器的运行工况,流速从0.6 m/s增至0.8 m/s时,单位孔深换热量仅增加3.8%。对于三组螺旋地埋管运行工况,在加热功率相同的条件下,水流量为1.71 m^3/h时的单位孔深换热量与流量为2.1 m^3/h时相差不大,建议采用小流量大温差运行。
Combined with a practical engineering, the variation of surrounding soil temperature during operation of spiral buried tube heat exchanger in pile foundation as well as the influence factors of heat transfer performance are investigated by the experimental method. During the operation, the deeper the depth is, the higher the soil temperature is. With the prolongation of heat transfer time, the increase in temperature of soil close to the ground is obviously higher than that of soil at deeper depth. Compared with a single set of spiral buried tubes, the operation of three sets of spiral buried tubes has an obvious effect on soil temperature. For the operation conditions of a single set of spiral buried tube heat exchanger, when the flow rate increased from 0.6 m/s to 0.8 m/s, the heat exchange per unit hole depth only increased by 3.7%. For the operation conditions of three sets of spiral buried tube heat exchanger, there is less difference between the heat exchange per unit hole depth at the flow rate of 1. 71 m^3/h and that at the flow rate of 2. 1 m^3/h under the condition of same heating power, and the operation with small flow rate and large temperature difference is recommended.
出处
《煤气与热力》
2015年第11期11-15,共5页
Gas & Heat
关键词
桩基螺旋地埋管换热器
土壤温度
换热性能
spiral buried tube heat exchanger in pile foundation
soil temperature
heat transfer performance
