跨临界二氧化碳汽车空调系统的动态仿真与实验研究

Dynamic Simulation and Experimental Validation of a Transcritical CO_2 Automobile Air Conditioning System

建立了跨临界二氧化碳汽车空调系统的动态仿真模型.利用集总参数法和移动边界法分别对蒸发器、气冷器和中间换热器建立了集总参数模型;由于压缩机和节流阀的热惯性较小,利用经验公式对它们建立了准稳态模型.计算结果同实验数据的比较表明,该动态模型能比较准确地体现空调系统实际的动态性能.

A numerical model was built to simulate the transient state behavior of a transcritical CO2 automobile air conditioning system. Lumped models were built for the evaporator, gascooler and internal heat exchanger respectively based on lumped parameter method and moving boundary method. Quasi-steady state models were applied for the compressor and expansion valve with empirical formula for their small thermal inertia. The numerical predictions of the dynamic model were then compared with the experimental data and a good agreement was found.