桩埋螺旋管地热换热器的数值模拟

Numerical Simulation for Pile Ground Heat Exchangers with Spiral Coils

建立桩基螺旋埋管地下换热器二维非稳态数值模型,考虑到不同的土壤初始温度,分析螺旋盘管间距及桩基深度对换热的影响.模拟结果表明,桩基螺旋地埋管每米换热量与盘管间距成线性关系,随着盘管间距的增加,每米螺旋管换热量的增加量减少;而对于桩基深度的增加,地埋管平均每米换热量仅略微降低,每米桩深相对减少量小于1.1%.

This paper aims at analyzing the influences of spiral coil spacing and pile foundation depths on heat transfer under different initial soil temperature, based on building two-dimensional unsteady numerical model of coil ground heat exchanger inside foundation piles. The simulation results indicate that the quantity of spiral coil ground heat exchanger per meter has a linear relationship with spiral coil spacing. The more the spacing gap increases, the more the increase of heat decreases. But with the increasing of pile foundation depths, the exchange heat quantity per meter of spiral coil only decreases slightly, and the relative decrement per meter is less than 1.1%.