Air-conditioning system operated with CO2

US6543239B2 · kind B2 · utility

Assignee

• Visteon Global Technologies, Inc. · US

Inventors

• Bernd Dienhart · Recklinghausen, DE
• Hans-Joachim Krauss · Stuttgart, DE
• Hagen Mittelstrass · Nagold, DE
• Karl-Heinz Staffa · Stuttgart, DE
• Christoph Walter · Stuttgart, DE
• Michael D. Katzenberger · Florissant, US
• Karl Lochmahr · Leinfelden, DE
• Werner Strauss · Kehl, DE

Key dates

• Filing date: Aug 5, 2002
• Grant date: Apr 8, 2003
• Expiry date: Aug 5, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F25B2700/21173
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

An air-conditioning system operated with CO2 for a vehicle has a high-pressure section that is connected to the output of a compressor and includes a gas cooler, a low-pressure section that is connected to the suction side of the compressor and includes an evaporator, and an expansion member connecting the high-pressure section and the low-pressure section. The expansion member has a fixed restrictor with a throttle opening of predetermined length and diameter connected between an inlet from the high-pressure section and an outlet to the low-pressure section whereby under all operating conditions of the system, a pressure of refrigerant in the high-pressure section of the system is limited to values of less than 14 MPa. The restrictor can be connected in parallel with a pressure limiting valve and can include two or more different throttle openings that can be selectively connected for refrigerant flow.