摘要
建立了二维轴对称模型,利用数值模拟的方法研究了桩基螺旋埋管换热器的瞬态导热情况。模拟得到了夏季和冬季运行工况下的温度场和换热量。计算结果表明,系统运行初期,由于螺旋管内水温与周围土壤的温差较大,因此换热速率较大;随着系统的运行,螺旋管周围土壤的温度升高(或降低),管壁与土壤的温差迅速降低,因此每米管长的换热量也随之降低。夏季的单位管长换热量在数值上一直大于冬季。如果在高层建筑内使用空调的面积比例较大,桩基螺旋埋管换热器只能满足部分空调负荷。
The transient heat conduction of helical heat exchangers inside a foundation pile was numerically studied using a 2-D axisymmetric model. The temperature distributions and heat transfer rates in the pile-foundation and surrounding soil were calculated for summer and winter conditions. At the beginning, the temperature difference between water and foundation pile was significant, which results in a high heat transfer rate. Then, as the foundation pile and soil were warmed up （or cooled down）, the temperature difference decreased as well as the heat transfer rate. Summer heat transfer per unit length has been larger than winter. Helical heat exchangers can only meet part of the air conditioning load in High-rise building.
作者
徐明海
刘文波
张知宇
XU Ming-hai LIU Wen-bo ZHANG Zhi-yu(College of Pipeline ＆ Civil Engineering, China University of Petroleum （East China Shandong Electric Power Engineering Consulting Institute Co., Ltd.)
出处
《建筑热能通风空调》
2017年第7期10-13,共4页
Building Energy & Environment
基金
中国石油大学(华东)自主创新科研计划项目(15CX06068A)
关键词
桩基螺旋埋管
土壤源热泵
数值模拟
foundation piles, helical heat exchangers, soil source heat pump, numerical simulation
