热气旁通制冷系统的数值模型建立与分析

Establishment and analysis of numerical model of hot gas bypass refrigeration system

针对热泵型电动汽车空调冬季除霜困难的问题,设计了一种带热气旁通能量调节的空调系统。通过提供一个虚拟的热负荷,改善了工质低压侧工作状态,从而达到除霜的目的。搭建系统进行台架实验,基于实验数据,建立了热气旁通制冷系统的数值模型。分析了旁通阀在不同开度下,车室内换热量、车室内出风温度、蒸发压力和压缩机吸气温度的变化趋势,并得出了当旁通阀开度为6圈时,系统运行状态最佳。

Aiming at the difficult problem of defrosting in air conditioning of heat pump electric vehicle in winter, an air conditioning system with hot gas bypass energy regulation was designed. A virtual thermal load was provided to improve the working state of low - pressure side, so as to achieve the purpose of defrosting. Based on the experimental data, a numerical model of hot gas bypass system was established. The change trends of the ear indoor heat exchange, the car indoor air temperature, evaporation pressure and the compressor suction temperature with the bypass valve in the different opening were analyzed. The system operation state is the best when the bypass valve opening degree is 6.