Patent ID: 6751983
Filing Date: 2004-06-22
Classification: B60H,F25B,F28D

Abstract:
An air-conditioning system for a motor vehicle comprising:a refrigerant circuit with a compressor for conveying a refrigerant from a low-pressure side to a high-pressure side; an evaporator; a header arranged on the low-pressure side between the evaporator and the compressor; an internal heat exchanger with a high-pressure-side heat exchanger duct; and a low-pressure-side heat exchanger duct which is in thermal contact with the high-pressure-side heat exchanger duct wherein the internal heat exchanger contains a coaxial tube conduit with an outer tube and an inner tube which has helical webs integrally formed on at least one of the inside of the outer tube and the outside of the inner tube, between the outer tube and the inner tube, one heat exchanger duct being formed by the interior of the inner tube and the other heat exchanger duct by the annular space between the outer tube and the inner tube, wherein the low-pressure-side heat exchanger duct forms a low-pressure-side refrigerant circuit portion between the header and at least one of the evaporator and the compressor and, wherein the internal heat exchanger contains a multiduct tube conduit, of which a low-pressure-side tube longitudinal duct has a first portion issuing into a header housing and a second portion issuing out of the header housing and a high-pressure-side tube longitudinal duct crosses the header housing continuously or issues with a first portion into a high-pressure leadthrough space formed within the header housing and issues with a second portion out of said high-pressure leadthrough space.