Abstract:
Die Erfindung betrifft ein Verfahren zum Betrieb eines drehzahlvariablen Kältemittelverdichters (2) zur Kühlung eines Kühlvolumens (4) einer Kälteanlage (1), welche über keine eigene Steuereinheit verfügt, wobei die Kälteanlage (1) zumindest einen Thermostat (3) zur direkten oder indirekten Überwachung eines Temperaturzustandes des Kühlvolumens (4) umfasst und wobei das Drehzahlverhalten des Kältemittelverdichters (2) während eines Kühlzyklus mittels einer in einer elektronischen Steuereinrichtung (6) des Kältemittelverdichters (2) gespeicherten Vorgabedrehzahlregelung auf Basis zumindest einer vordefinierten Kenngröße geregelt wird, indem die zumindest eine vordefinierte Kenngröße hinsichtlich Über- und/oder Unterschreitung durch eine aktuelle Kenngröße eines aktuellen Kühlzyklus überwacht wird, sowie eine elektronische Steuereinrichtung (6) zur Steuerung des zyklischen Betriebs eines drehzahlvariablen Kältemittelverdichters. Um eine Anpassung der durch die elektronische Steuereinrichtung (6) des Kältemittelverdichters (2) vorgenommene Vorgabedrehzahlregelung an die Kälteanlage und/oder Umgebungsbedingungen zu ermöglichen, ist erfindungsgemäß vorgesehen, dass eine von der Temperatur des Kühlvolumens (4) unabhängige, weitere Temperatur gemessen wird und die zumindest eine vordefinierte Kenngröße in Abhängigkeit der weiteren Temperatur geändert wird.
Abstract:
The present disclosure relates to the field of air conditioning technology. In particular, it involves a control method and control device based on a DC variable speed AC compressor.
Abstract:
Disclosed is a refrigeration system comprising a refrigerant circuit (10), a heat exchanger (34), an expansion member (38) which, in the active state, expands the entire mass flow (G) of the refrigerant, in said process generating a main mass flow (H) of liquid refrigerant and an additional mass flow (Z) of gaseous refrigerant, both of which enter an intermediate pressure accumulator (42), the refrigeration system further comprising at least one normal cooling stage (52) which expands a normal cooling mass flow (N) to a low pressure in at least one normal cooling expansion unit (54), in said process making available refrigerating power for normal cooling, the refrigeration system also comprising a refrigerant compressor unit (12) that compresses the normal cooling mass flow from the low pressure to a high pressure, and a parallel compressor (164) which, in a parallel compression mode of the refrigerant circuit, sucks in refrigerant from the intermediate pressure accumulator and compresses same to a high pressure. In order to increase the efficiency of a refrigeration system of this type, the power of the parallel compressor is controlled by a controller (40), the controller determines at least one reference variable representing a load condition of the refrigerant circuit, the controller determines a desired intermediate pressure value on the basis of the at least one reference variable at least during operation of the parallel compressor, and the controller adjusts the intermediate pressure in accordance with the desired intermediate pressure value at least during operation of the parallel compressor.
Abstract:
A system includes a variable-capacity compressor operable in a first capacity mode and in a second capacity mode that is higher than the first capacity mode. A variable-speed blower is operable at a first speed and at a second speed that is higher than the first speed. A control module is configured to (i) receive indoor relative humidity data corresponding to an indoor relative humidity (ii) switch the variable-capacity compressor between the first capacity mode and the second capacity mode based on a demand signal from a thermostat and the indoor relative humidity and (iii) switch the variable-speed blower between the first speed and the second speed based on the demand signal from the thermostat and the indoor relative humidity.
Abstract:
A method for estimating a thermal capacity of foodstuff stored in a refrigerated volume of a refrigeration system. A thermal capacity of air inside the refrigerated volume is estimated, e.g. a time constant. Then the setpoint temperature for the air inside the refrigerated volume is changed, and the air temperature inside the refrigerated volume is monitored. A thermal capacity of the foodstuff stored in the refrigerated volume, e.g. a time constant, is estimated, based on the monitored air temperature and on the estimated thermal capacity of the air inside the refrigerated volume. The refrigeration system is controlled at least partly on the basis of the estimated thermal capacity of the foodstuff stored in the refrigerated volume.