Method of monitoring refrigerant level
First Claim
1. 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 comprising:
- at least in-operation level monitoring with the compressor switched on, measuring the refrigerant superheat (dTü
) at the evaporator of the system, and determining whether the measured superheat (dTü
) lies above a predetermined limiting value (dTü
G), as an indication of improper filling.
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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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Citations
6 Claims
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1. 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 comprising:
at least in-operation level monitoring with the compressor switched on, measuring the refrigerant superheat (dTü
) at the evaporator of the system, and determining whether the measured superheat (dTü
) lies above a predetermined limiting value (dTü
G), as an indication of improper filling.- View Dependent Claims (2, 3, 4)
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5. An apparatus for 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 apparatus comprising:
at least a system for in-operation level monitoring with the compressor switched on, comprising detectors for measuring the refrigerant superheat (dTü
) at the evaporator of the system, and a calculation circuit for determining whether the measured superheat (dTü
) lies above a predetermined limiting value (dTü
G), as an indication of improper filling.- View Dependent Claims (6)
Specification