Daimler Chrysler Ag

Florian Kauf

Joachim Currle

Frank Fruehauf

Juergen Wertenbach

J&uuml;rgen Wertenbach

Thomas Finkenberger

Juergen Maué

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

The invention relates to a method for operating a subcritically and transcritically operated vehicle air conditioner having a vapor compression circuit in which in which a compressor, a gas cooler, an expansion valve and an evaporator are connected in series and form an integral closed cycle. On the high-pressure side of the vapor compression circuit, for the purpose of offering refrigerating capacity, a pressure is produced which is supercritical with reference to the critical pressure of the refrigerant circulating in the circuit, and a subcritical pressure is reached simultaneously on the low-pressure side of the circuit. Thermal energy is fed via the evaporator to the refrigerant cooled down on the low-pressure side with the refrigerant mass flow being regulated by the compressor and the desired high pressure being set by means of an expansion valve. During the starting operation of the vehicle air conditioner the refrigerant mass flow is set directly to a required value and the refrigerant pressure is set in accordance with at least one prescribed parameter, and the air conditioner is regulated upon the overshooting of safety pressure limits P1-P4, the regulation depending upon which safety pressure limits are overshot.

Method for operating a subcritically and transcritically operated vehicle air conditioner

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Stuttgart, Germany

Florian Kauf