论文标题
在冰点条件下，通过同轴接地热交换器对热萃取的数值模拟
Numerical simulation of heat extraction by a coaxial ground heat exchanger under freezing conditions
论文作者
论文摘要
考虑到地面湿度的冻结，提出了浅的同轴接地热交换器和周围分层土壤中的热传递的新有限差分模型。三种模式的热交换器操作是数值模拟的：固定模式，瞬态模式和受控模式。在固定模式下，计算了热载体流体出口温度对热交换器参数变化的敏感性的估计。在所有模式中，都要密切注意在流体的负温度下证明结果的差异，该结果以或不考虑地面水分的冻结计算。结果表明，由于零源效应引起的这种差异的范围从固定模式的10％到控制模式下的35％。
A new finite-difference model of heat transfer inside a shallow coaxial ground heat exchanger and in the surrounding layered soil is presented, taking into account the freezing of ground moisture. Three modes of heat exchanger operation are numerically simulated: stationary mode, transient mode and controlled mode. In the stationary mode, estimates of the sensitivity of the heat carrier fluid outlet temperature to changes in the heat exchanger parameters are calculated. In all modes, close attention is paid to demonstrating the difference in the results at a negative temperature of the fluid, calculated with and without taking into account the freezing of ground moisture. It is shown that this difference, caused by the zero-curtain effect, can range from 10% in the stationary mode to 35% in the control mode.
