摘要
《地源热泵工程技术规范》尚未对地埋管换热孔深度做出具体要求,通过建立三维数值传热模型,计算了不同深度时的传热情况,分析各种因素对地埋管换热器深度的影响,认为换热管内的流体流量为影响换热孔深度的一个重要因素,地温梯度、回填材料热物性和管道间距也对不同深度换热孔的换热能力产生了一定影响。因此在实际工程中,需要将换热孔深度加大时应相应提高管内流体流量,并合理加大换热管尺寸。
Shallow geothermal energy is defined in The Standard for Evaluation as the heat energy which is ＂contained in the surface depth no more than of Shallow Geothermal Energy 200 meters and not exceeds 25℃＂ . In addition, there is no specific rule on the Borehole Heat Exchanger（BHE） depth in Technical Code for Ground-Source Heat Pump System. Generally take 100 - 120 meters, according to the actual engineering experience and calculation. A three-dimensional numerical heat transfer model is proposed in this paper,which calculates the heat transfer in different depths and analyzes the influence of various factors on the depth of BHE. Conclused that the flow rate in the pipe is the most important factor. Geothermal gradient, thermal physical properties of backfill material and the spacing between pipes also have influence on the heat transfer of the BHE in different depths.So in actual project ,if we want increase BHE depth, we should increase the flow rate in the pipe and reasonablely increase BHE size.
出处
《河北工程大学学报（自然科学版）》
CAS
2017年第1期66-71,共6页
Journal of Hebei University of Engineering:Natural Science Edition
基金
河北省自然科学基金资助项目(D20090000833)
关键词
换热孔深度
数值传热模型
流体流量
换热孔参数
depth of borehole heat exchanger
numerical heat transfer models
flow rate
parameters ofBHE.
