Mannesmann Vdo Ag

Hans-Martin Knaus

Detlef Kettner

Siegfried Reuter

It is proposed to design a compression-type refrigeration system of a motor-vehicle air-conditioning unit having a supercritical process, with a compressor ( ), driven by an electric motor ( ) with motor-control device ( ), a gas cooler ( ), an expansion member ( ) and an evaporator ( ) and also connecting elements for a circulation of a refrigerant, in such a way that the heat loss of the motor and/or of the motor-control device is essentially dissipated to the refrigerant. In particular, the refrigerant may flow around the motor and/or the motor-control device. This results in especially efficient cooling of the components, as a result of which their heat loss is reduced at the same time. Furthermore, in order to achieve a high efficiency of the entire unit, provision is made for the superheating of the refrigerant at the inlet of the compressor to be kept at a virtually constant level by a controlled expansion member.

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Speyer, Germany

Hans-Martin Knaus