Air-conditioning system operated with CO2

An air-conditioning system for a vehicle, the air-conditioning system capable of being operated with CO2, the air-conditioning system comprising:

• a compressor;
• a high-pressure section connected to an output of said compressor and including a gas cooler;
• a low-pressure section connected to a suction side of said compressor and including an evaporator;
• and
• an expansion member connecting said high-pressure section to said low-pressure section, said expansion member including a plurality of fixed restrictors connected in parallel with control means for selectively directing refrigerant through the fixed restrictors, each of the fixed restrictors having a throttle opening of predetermined length and diameter connected between an inlet from said high-pressure section and an outlet to said low-pressure section whereby under all operating conditions of the system, a pressure of refrigerant in said high-pressure section of the system is limited to a predetermined value.

An air-conditioning system for a vehicle, the air-conditioning system capable of being operated with CO2, the air-conditioning system comprising:

• a compressor;
• a high-pressure section connected to an output of said compressor and including a gas cooler;
• a low-pressure section connected to a suction side of said compressor and including an evaporator;
• and
• an expansion member connecting said high-pressure section to said low-pressure section, said expansion member including a fixed restrictor including at least two different throttle openings and valve means for selectively directing refrigerant flow to the throttle openings, the throttle openings having a predetermined length and a diameter and being connected between an inlet from said high-pressure section and an outlet to said low-pressure section whereby under all operating conditions of the system, a pressure of refrigerant in said high-pressure section of the system is limited to a predetermined value.