Air-conditioning unit with additional heat transfer unit in the refrigerant circuit

US6910345B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Peter Horstmann · Leonberg, DE
• Stephan Leuthner · Leonberg, DE
• Peter Satzger · Landsberg am Lech, DE
• Gernot Mall · Pforzheim, DE
• Petra Kanters · Stuttgart, DE

Key dates

• Filing date: Oct 14, 2002
• Grant date: Jun 28, 2005
• Expiry date: May 31, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F25B2600/2501
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an air-conditioning unit (10) for a motor vehicle with a heating heat transfer unit (28) connected to a coolant circuit (42) in an internal combustion engine and comprising an evaporator (22) installed upstream in the direction of flow of a fan (36). A compressor (12) in a refrigerant circuit (32) pumps a refrigerant through a gas cooler (16) and an expansion valve (20) during a cooling operation, and pumps said refrigerant to the evaporator (22) via the expansion valve (20) by by-passing the gas cooler (16) during a heating operation. A coupled heat exchanger (30) is provided between the coolant circuit (42) and the refrigerant circuit (32). The invention provides that the coupled heat exchanger (30) is located in the refrigerant circuit (32) on the pressure side of the compressor (12) upstream of the gas cooler (16), a first by-pass line (80) is provided parallel to the gas cooler (16) and the flow through the gas cooler (16) and the first by-pass line (80) is controlled by a switching valve (52) in the first by-pass line (80) and a switching valve (48, 50) located at each of the inlet and outlet of the gas cooler (16), depending on operating parameters, …