低温空气源热泵相变蓄热除霜性能模拟研究

Simulation of Phase Change Heat Storage Defrosting Performance of Low Temperature Air Source Heat Pump

低温空气源热泵是目前主流的节能设备之一,但其发展受到结霜问题的困扰。以相变蓄热除霜技术为基础,借助Fluent软件对蓄热器传热模型进行了建模,模拟分析了换热管数量、换热流体温度和换热流体流速对蓄热器传热效果的影响。结果表明:在结构合理的基础上,增加蓄热器内换热管数量可以提高传热性能;随着传热流体的温度与相变材料的温差增大,蓄热器的传热效果增强,除霜效果增强;流速增大,蓄热器的传热效果增强,除霜效果增强。

Low temperature air source heat pump is one of the mainstream energy-saving equipment,but its development is plagued by frosting.In this paper,based on the phase change thermal storage defrosting technology,the heat transfer model of the regenerator is established with the help of FLUENT software.The influence of the number of heat exchange tubes,the temperature of the heat exchange fluid and the flow rate of the heat exchange fluid on the heat transfer effect of the regenerator is simulated and analyzed.The results show that:on the basis of reasonable structure,increasing the number of heat exchange tubes in the regenerator can improve the heat transfer performance;with the increase of the temperature difference between the heat transfer fluid and the phase change material,the heat transfer effect and defrosting effect of the regenerator are enhanced;with the increase of the flow rate,the heat transfer effect and defrosting effect of the regenerator are enhanced.