地源热泵群孔长期换热有限长体热源模型  

Finite long body source model of tube group after long-time heat exchange in ground source heat pump

作　　者：战国会[1] 张仪萍[1] 徐坚[1] 俞亚南[1] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2011年第8期1411-1415,共5页Journal of Zhejiang University：Engineering Science

摘　　要：为进一步提高地源热泵群孔系统解析模型的精确性和简洁性,对地源热泵群孔系统长期运行后的温度场进行研究.根据已建立的单孔有限长圆柱体热源模型,在圆柱体半径不超过临界半径时,有限长圆柱体热源模型与有限长线热源模型的钻孔外温升偏差可忽略不计.基于此性质,将现有群孔叠加分析法中的线热源模型替换为圆柱体热源模型,建立群孔长期换热有限长体热源模型.与线热源叠加法和有限元法对比表明,该群孔长期换热体热源模型与线源叠加法具有相同的计算精度,但计算量明显减少.对不同钻孔布置形式下该群孔体源模型与线热源叠加法的偏差进行分析,结果表明随体积近似偏差的增大而两者的偏差略有增长.Thermal field after a long-time running was studied in order to further improve the accuracy and the simplicity of analytical model for the ground source heat pump tube group system.According to the existed finite length cylinder source model of single tube,the error of the rising temperature outside the cylinder between the finite length cylinder source model and the finite length line source model is negligible when the radius of the cylinder is not larger than the critical value.Based on this finding,the finite length body source model of tube group system was built by replacing the line source model with the cylinder source model in the existed superposition method.The finite length body source model has the same accuracy but the amount of calculation is obviously reduced by comparing with the line source superposition method and the finite element method.The difference between the finite length body source model and the line source superposition model was analyzed for different arranged form of the tube group system,and the result shows that the difference increases slightly as the difference of volume approximation increasing.

关 键 词：地源热泵 格林函数 群孔 体热源模型 

分 类 号：TU111[建筑科学—建筑理论]