Refrigeration – With indicator or tester – Condition sensing
Reexamination Certificate
2006-12-12
2006-12-12
Norman, Marc (Department: 3744)
Refrigeration
With indicator or tester
Condition sensing
C062S208000, C062S130000, C062S149000
Reexamination Certificate
active
07146819
ABSTRACT:
The invention relates to a method of refrigerant level monitoring in a refrigerant circuit of an air-conditioning or heat-pump system having a compressor and a refrigerant which may, depending on the operating point, be operated in the supercritical range. The method includes standstill level monitoring with the compressor switched off and/or in-operation level monitoring with the compressor switched on. In the case of in-operation level monitoring, the refrigerant overheat (dTü) at the evaporator is registered and, in the event of excessive overheat, it is concluded that there is underfilling. At a standstill, the pressure and temperature of the refrigerant are registered, and it is concluded that there is an improper refrigerant filling level if the pressure (pKM) lies below a minimum pressure value (pmin) or the temperature (TKM) lies above a maximum saturation temperature value (TS) with the pressure being outside a predefinable intended pressure range ([pu,po]).
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Demuth Walter
Heilig Rainer
Kirschner Volker
Kotsch Martin
Krauss Hans-Joachim
BEHR GmbH & Co.
Norman Marc
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