Abstract:In order to explore the influence of hot and humid environment on the airborne vapor cycle systems, a simulation model was established based on the AMESim platform. The compressor rotation speed was controlled by the proportional-integral method, and the system characteristics were dynamically simulated under a helicopter flight profile. The results show that the ambient temperature and relative humidity have significant influence on the system characteristics. The higher the ambient temperature is or the relative humidity is, the greater the refrigerating capacity is, the smaller the COP is, and the longer the time to the setting temperature is. High relative humidity results in the increase of the refrigerant pressure loss and the reduction of the heat exchange efficiency of the evaporator. Moreover, the flight profile has great influence on the system characteristics. The system characteristics change dramatically in the ground standby phase and climbing phase, but a little in the cruising phase. In the descending phase, all characteristics increase first and then decrease due to the coupling effect of flight velocity and ambient temperature on the cabin thermal load, except the COP which keeps declining. Thus, peaks of some characteristics appear in this phase. All characteristics tend to be stable in the ground parking phase.