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A method and system for discharging refrigerant, such as carbon dioxide, from an air conditioning system. The discharge rate of the refrigerant from the air conditioning system is controlled by a discharge rate controller, even as refrigerant pressure at the system input varies. By maintaining disch

A method and system for discharging refrigerant, such as carbon dioxide, from an air conditioning system. The discharge rate of the refrigerant from the air conditioning system is controlled by a discharge rate controller, even as refrigerant pressure at the system input varies. By maintaining discharge rate at a controlled value, the discharge time of the refrigerant from the air conditioning system is reduced.

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What is claimed is: 1. A refrigerant discharge system for discharging refrigerant from an air conditioner, comprising: a system input connectable to an air conditioner discharge port; a system output at which refrigerant from the air conditioner is discharged; and a discharge flow rate controller c

What is claimed is: 1. A refrigerant discharge system for discharging refrigerant from an air conditioner, comprising: a system input connectable to an air conditioner discharge port; a system output at which refrigerant from the air conditioner is discharged; and a discharge flow rate controller connected between the system input and the system output and configured to control the discharge flow rate of the refrigerant from the system output at a substantially constant value as refrigerant pressure at the system input varies. 2. The system of claim 1, wherein the discharge flow rate controller comprises a pressure regulator with a pressure regulator input forming the system input, and having a pressure regulator output. 3. The system of claim 2, wherein the pressure regulator is configured to produce a refrigerant output pressure at the pressure regulator output that is substantially lower than the refrigerant pressure at the system input. 4. The system of claim 3, wherein the refrigerant output pressure at the pressure regulator output is less than one-half the refrigerant pressure at the system input. 5. The system of claim 4, wherein the discharge flow rate controller further comprises a fixed orifice having an input coupled to the pressure regulator output, and a fixed orifice outlet. 6. The system of claim 5, wherein the pressure regulator is a mechanical pressure regulator. 7. The system of claim 1, wherein the discharge flow rate controller comprises an electrically controllable valve coupled between the system input and the system output. 8. The system of claim 7, wherein the discharge flow rate controller further comprises a pressure monitor coupled to monitor the refrigerant pressure at the system input. 9. The system of claim 8, wherein the pressure monitor is coupled to the electrically controllable valve and generates a pressure signal that controls the electrically controllable valve as a function of the refrigerant pressure at the system input. 10. The system of claim 9, wherein the refrigerant is CO2. 11. The system of claim 6, wherein the refrigerant is CO2. 12. The system of claim 1, wherein the air conditioner is an automotive air conditioner. 13. The arrangement of claim 12, wherein the air conditioner is an automotive air conditioner. 14. An arrangement for discharging refrigerant from an air conditioner, the arrangement comprising: a refrigerant input at which refrigerant is received from the air conditioner; a refrigerant output at which the refrigerant is discharged from the arrangement; and means for maintaining a substantially controlled constant discharge flow rate of the refrigerant from the refrigerant output as pressure of the refrigerant at the refrigerant input varies. 15. The arrangement of claim 14, wherein the means for maintaining includes means for regulating output pressure of refrigerant at the refrigerant output as the pressure of the refrigerant at the refrigerant input varies. 16. The arrangement of claim 15, wherein the means for regulating output pressure includes a mechanical pressure regulator coupled between the refrigerant input and the refrigerant output. 17. The arrangement of claim 16, wherein the means for regulating output pressure includes a fixed orifice coupled between the mechanical pressure regulator and the refrigerant output. 18. The arrangement of claim 17, wherein the refrigerant is CO2. 19. The arrangement of claim 15, wherein the means for regulating output pressure includes an electrically controllable valve coupled between the refrigerant input and the refrigerant output. 20. The arrangement of claim 19, wherein the means for regulating output pressure includes means for monitoring the pressure of the refrigerant at the refrigerant input and control the electronically controllable valve in response thereto so as to maintain a substantially controlled constant discharge flow rate of the refrigerant from the refrigerant output. 21. The arrangement of claim 19, wherein the refrigerant is CO2. 22. A method of discharging refrigerant from an air conditioning system, comprising the steps of: opening a discharge outlet of the air conditioning system; and maintaining a discharge flow rate of the refrigerant from the air conditioning system at a substantially controlled constant value as pressure of the refrigerant at the discharge outlet varies. 23. The method of claim 22, wherein the refrigerant is CO2. 24. The method of claim 23, wherein the step of maintaining a discharge flow rate includes regulating output pressure of the refrigerant. 25. The method of claim 22, wherein the air conditioner is an automotive air conditioner.