Daimler Chrysler Ag

Daimler Ag

Mercedes-benz Aktiengesellschaft

Juergen Wertenbach

Joachim Currle

Frank Fruehauf

Jan Gaertner

Roland Caesar

Juergen Maue

Wolfgang Straub

Guenter Abersfelder

Thomas Finkenberger

Florian Kauf

Juergen Maué

A method for air conditioning a motor vehicle, in which, in a heating mode, the passenger compartment of the motor vehicle is heated via a passenger compartment heat exchanger () through heat pump operation of a refrigerating circuit (). To prevent fogging of the windows of the motor vehicle from the outset, the temperature and humidity in the passenger compartment are recorded by measurement technology, and when the temperature is in a predefined range and the atmospheric humidity reaches a defined threshold, the mass flow of refrigerant in the circuit is throttled upstream of the passenger compartment heat exchanger (), in such a manner that the moisture contained in the air stream passing the passenger compartment heat exchanger () is at least substantially condensed at the passenger compartment heat exchanger (), and the moisture which has already condensed at the heat exchanger () remains at the heat exchanger (). The passenger compartment is heated by a heat source which is outside the circuit () until the temperature in the passenger compartment exceeds an upper limit temperature of the predefined range.

Method for air conditioning a motor vehicle

A heating and/or air conditioning system for an interior of a vehicle has a central heating and/or cooling device and a decentralized air-conveying device which includes a plurality of air-conveying units arranged locally in the vehicle interior. In order to permit good regulation of the heating and/or air conditioning system and efficient air conditioning, respective air-conveying units of the decentralized air-conveying device are arranged in a plurality of subspaces of the vehicle interior for circulating air in the respective subspaces.

Heating and/or air conditioning system having a decentralized air-conveying device

A heating and/or air-conditioning system for vehicles, preferably passenger vehicles, has a central air-conditioning and/or air-conveying device for conditioning and/or conveying air. In order to achieve optimum air conditioning of the vehicle interior and sufficient freedom of the windows from misting with the most effective energy use possible, the air within the vehicle interior is fed so that, for example, outside air and circulating air are fed into the vehicle interior through dedicated air inlet openings and removed from the vehicle interior through dedicated air outlet openings. The air is guided on closed flow paths in order to achieve separation of circulating air and outside air.

Heating and/or air-conditioning system with ventilation and evacuation

A refrigerant circuit for a motor vehicle air-conditioning system has a refrigerant compressor, a cooler connected downstream of the refrigerant compressor, a restrictor for expanding the refrigerant, and an evaporator for transferring heat to the refrigerant. Pressure in the refrigerant circuit is measured firstly on the high-pressure side and secondly on the low-pressure side. An air-conditioning system can be driven directly or indirectly by the motor vehicle driving engine. The refrigerant in the refrigerant circuit is almost completely liquefied upstream of the restrictor, so that it is easy to determine the refrigerant mass flow. As a result, it becomes possible to determine the compressor torque which is consumed by the refrigerant circuit and to control the motor vehicle driving engine accordingly.

Method for operating a refrigerant circuit, method for operating a motor vehicle driving engine, and refrigerant circuit

A method for operating a refrigerating unit for the air conditioning of vehicles and a refrigerating unit for carrying out the method, are provided. In order to make available refrigerating capacity, on the high pressure side of a vapor compression circuit, a pressure is produced which, with respect to the critical pressure of a refrigerant circulating in the circuit, is supercritical and, at the same time, on the low pressure side of the circuit, a subcritical pressure is achieved. In this arrangement, the circuit contains a compressor, a gas cooler, a throttle device and an evaporator which are series-connected and form an integral, closed circuit. The refrigerant, which is cooled on the low pressure side, is supplied, via the evaporator, with thermal energy, and refrigerating energy is removed. In order to increase the efficiency and the comfort of the system to such an extent that an air conditioning system operating with this unit is suitable for use in a vehicle, the refrigerant mass flow in the circuit is varied by regulating the refrigerant flow rate in the compressor.

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Fellbach, Germany

Juergen Wertenbach