风冷热泵蒸发器结霜的动态分布参数模型仿真研究

Study on transient distributing parameter model of frost in simulation of air-cooled heat pump

目前在风冷热泵机组的仿真研究中 ,对蒸发器结霜过程的模拟主要是采用一些由实验拟合而成的集总参数模型 ,而这些模型往往是在特定的运行条件下得到的。因而适用性不是很好。提出了一个风冷热泵蒸发器结霜过程的动态分布参数模型 ,该模型把霜层的生长过程看成是一种多孔介质、具有移动边界的动态相变传热传质过程。研究结果表明这一模型适合于蒸发器结霜的动态研究。

At present,the lumped parameter model of frost,which is based on experience and depend heavenly on the running condition,is widely used in simulation of air-cooled heat pump.A novel dynamic distributing parameter model is presented in this paper.The model takes the frost deposition on evaporator as one dimensional,transient formulation,whose mass and heat is transferred in porosity and has a moving boundary.Result shows the model is suitable to the simulation of air-cooled heat pump.