The transcritical CO2 heat pump air-conditioning system has a good low-temperature heating capacity

and the dynamic parameter changes during its operation have a significant impact on the thermal comfort of the passenger cabin. In order to study the comfort of the passenger compartment and the coupling law of the dynamic changes of the parameters of the transcritical CO2 heat pump air conditioning system

a joint simulation model was built based on the one-dimensional simulation software GT-Suite and the three-dimensional CFD software STAR-CCM+ to study the three-dimensional model of the vehicle air-conditioning system in the passenger compartment. The three-dimensional cabin model can provide accurate real-time state parameters of supply air and return air for the one-dimensional simulation system of heat pump air conditioners. The results show that the temperature distribution of the thermal environment of the passenger compartment is relatively non-uniform

and it is necessary to use the weighted PMV (Predicted Mean Vote) to evaluate the non-uniform thermal environment of the passenger compartment. In the multi-PID control transcritical CO2 automobile heat pump air conditioning system

the control method based on the weighted PMV comfort model can keep the regulation and stability of the system target parameters. Under the ambient temperature condition of 43 °C in the cooling mode

the control method can reduce the power consumption of the compressor by more than 9%. In the heating mode -10 ℃ ambient temperature condition

this method can reduce the power consumption of the compressor by more than 18%. This control method can reduce the power consumption of the system compressor under the premise of meeting the comfort requirements

which is a very effective Energy saving control scheme.