Defrosting method for the evaporator of a refriger

专利名称：Defrosting method for the evaporator of a

refrigerator machine used, for example, as aheat pump

发明人：GARTNER, FRANZ-GEORG, DR. DIPL.-PHYS.,KUHL, DIETER,SCHWEER, HANSULRICH

申请号：EP83109864.5申请日：19831003公开号：EP0108906B1公开日：19880107

摘要：1. A method of defrosting an evaporator of a refrigerating machine whichoperates as a heat pump, comprising the following features : a) after each heatingoperation, a defrosting process is started, the end of which is determined by the

instantaneous value of a variable of state ; b) after each defrosting process a new heatingoperation is started, the duration of which is determined by a linearly multiplied, positivedifference between a defrosting time to be established, and the last defrosting time ineach case ; c) below a predetermined instantaneous value of the external temperature,the heating operation time which in each case follows a defrosting process, is determinedby the heating operation time which has preceded the defrosting process plus a timevalue which is calculated from the difference between the last but one and the lastdefrosting time, linearly multiplied by a positive amplification factor ; d) after a precedingheating operation, each defrosting process is terminated when a variable of state of therefrigerating medium reaches the predetermined instantaneous value in the evaporator ;

e) above the predetermined instantaneous value of the external temperature, adefrosting process is initiated if the ratio of running time to shut-down time of the heatpump exceeds a predetermined value, for example 2:1 ; f) the time of the heatingoperation is limited by a minimum value and a maximum value ; g) the defrosting processis broken off and a switch-over takes place to the minimum heating time when, at the endof a preset time, for example seven minutes, the predetermined instantaneous value ofthe variable of state of the refrigerating medium contained in the evaporator has notbeen reached.

申请人：SIEMENS AKTIENGESELLSCHAFT BERLIN UND MUNCHEN,SIEMENSAKTIENGESELLSCHAFT BERLIN UND MUNCHEN

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