REFRIGERANT SHORTAGE DETERMINATION DEVICE, REFRIGERATION CYCLE HAVING THE SAME, AND REFRIGERANT SHORTAGE DETERMINATION METHOD OF REFRIGERATION CYCLE

摘要

PROBLEM TO BE SOLVED: To provide a refrigerant shortage determination technology which prevents the erroneous determination of the shortage of a refrigerant amount even if the refrigerant amount in a refrigeration cycle is proper, and can accurately determine the presence or absence of the shortage of the refrigerant amount in a short time.;SOLUTION: A refrigerant shortage determination device comprises: first determination means which temporarily determines the shortage of a refrigerant amount in a refrigeration cycle when a difference between a temperature Tev which is detected by an evaporator temperature detection sensor and a target temperature To reaches a first prescribed value α or higher; and second determination means which temporarily determines the shortage of the refrigerant amount in the refrigeration cycle when a difference between first refrigerant saturation pressure PHL which is introduced from an outside temperature which is detected by an outside temperature detection sensor, and second refrigerant saturation pressure PSa being the pressure of a refrigerant which is detected by a refrigerant pressure detection sensor reaches a second prescribed value β1 or higher. When the first determination means temporarily determines that the refrigerant amount in the refrigeration cycle is in shortage, and the second detection means determines that the refrigerant amount in the refrigeration cycle is in shortage, the refrigerant shortage determination device defines the determination of the shortage of the refrigerant amount in the refrigeration cycle.;SELECTED DRAWING: Figure 2;COPYRIGHT: (C)2016,JPO&INPIT