真空管太阳能集热系统温度场、速度场模拟

Simulation of Temperature Field and Velocity Field of Vaccum Tube Solar Collector

采用三维数学及物理模型对真空管太阳能集热系统的温度场、速度场进行了模拟。集热系统内流体由上升的热流体和下降的冷流体组成,接近蓄热水箱的真空管存在冷热流体混合的回流区。蓄热水箱内呈现明显的温度分层,水箱上部的流体被来自真空管的热射流加热,下部存在一个滞留区,只能通过导热传热。

The temperature field and velocity field of vacuum tube solar collector are simulated by three-dimensional mathematical and physical models. The fluid in the collector is composed of rising hot fluid and descending cold fluid, and a return zone where the hot fluid and cold fluid are mixed exists in the vacuum tube near heat storage water tank. The significant temperature stratification occurs in the heat storage water tank. The fluid in the upper part of the heat storage water tank is heated by hot jet from the vacuum tube, and a retention zone exists in the lower part where heat is only transferred by conduction.