Verfahren zur Überwachung einer Füllmenge eines Kältemittels in einem Kältemittelkreislauf einer Kälteanlage

• Main Authors: Gömpel, Hartmut, Sonnekalb, Michael, Fink, Sebastian, Merle, Philipp, Hellwig, Benjamin
• Format: Patent
• Language: German
• Published: 04.10.2018
• Subjects: ARRANGEMENTS OR ADAPTATIONS OF HEATING, COOLING, VENTILATING,OR OTHER AIR-TREATING DEVICES SPECIALLY FOR PASSENGER OR GOODSSPACES OF VEHICLES; BLASTING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; HEATING; LIGHTING; LIQUEFACTION SOLIDIFICATION OF GASES; MANUFACTURE OR STORAGE OF ICE; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; REFRIGERATION MACHINES, PLANTS OR SYSTEMS; REFRIGERATION OR COOLING; TRANSPORTING; VEHICLES IN GENERAL; WEAPONS

Verfahren zur Überwachung einer Füllmenge eines Kältemittels in einem Kältemittelkreislauf (46) einer Kälteanlage (10), mit einem Kompressor (12), einem Kondensator oder einem Gaskühler (14), einer Entspannungsvorrichtung (16) und einer Verdampfereinrichtung (18), wobei eine Füllmengenüberwachung bei ausgeschaltetem Kompressor (12) folgende Schritte umfasst:- Messen mindestens einer Temperatur des Kältemittels in dem Kältemittelkreislauf (46) an der Verdampfereinrichtung (18) und einer Temperatur des Kältemittels in dem Kältemittelkreislauf (46) an dem Kondensator oder dem Gaskühler (14);- Messen eines Drucks des Kältemittels in der Kälteanlage (10);- Ermitteln einer Kältemittelfehlfüllung, insbesondere einer Unterfüllung an Kältemittel, wenn der gemessene Druck außerhalb eines Solldruckbereichs liegt, wobei ein Solldruck des Kältemittels, ausgehend von der niedrigsten gemessenen Temperatur, bestimmt wird, und der Solldruckbereich Druckwerte umfasst, welche von dem Solldruck höchstens um eine vorgegebene Toleranz abweichen. The invention relates to a method and device used for monitoring refrigerant charge in a refrigerant loop (46) of a refrigeration system; the refrigeration system (10) comprises a compressor (12), a condenser or a gas cooler (14), an expansion device (16) and an evaporator device (18); when the compressor (12) is closed, the method comprises the following steps: measuring at least one temperature, and measuring refrigerant pressure in the refrigeration system; if the measured pressure is out of a nominal pressure scope, determining the refrigerant charge error, when the refrigerant is not enough, the refrigerant nominal pressure is determined according to the measured temperature, and the nominal pressure scope comprises the pressure value having the most regulated deviation from the nominal pressure; when the compressor is opened, the method comprises the following steps: measuring at least one temperature; measuring refrigerant pressure in the exit of the condenser or gas cooler; if the measured pressure is out of the nominal pressure scope, building the refrigerant charge error, especially the refrigerant is not enough, wherein the refrigerant nominal pressure is determined according to the measured temperature, and the nominal pressure scope comprises the pressure value and the pressure value having the most regulated deviation from the nominal pressure; the device also comprises a container (22) used for storing refrigerant; the refrigerant is specially CO2; the device runs in a cross critical range according to work points; at least one refrigerant temperature sensor (32) and at least one refrigerant pressure sensor (34) are provided so as to measure the temperature and pressure of the refrigerant; the refrigerant temperature and pressure can be evaluated in the mode in a control unit (30), so the refrigerant charge error can be detected if the insufficiency is detected, the control unit can control medium on the refrigerant loop (46) so as to start filling.