REFRIGERANT LEAKAGE DETERMINATION DEVICE, FREEZING DEVICE INCLUDING THIS REFRIGERANT LEAKAGE DETERMINATION DEVICE, AND REFRIGERANT LEAKAGE DETERMINATION METHOD

摘要

This refrigerant leakage determination device (60) includes a calculation unit (66) and a determination unit (67). The calculation unit (66) calculates a deviation degree from a normal state of a refrigerant circuit (20) on the basis of data pertaining to the operation of a freezing device (1). The determination unit (67) determines whether a refrigerant is leaking on the basis of a calculation result from the calculation unit (66), or predicts a refrigerant leakage occurrence time. The calculation unit (66) calculates a first index value calculated from data pertaining to the operation of the freezing device (1) in a first period among data pertaining to the operation of the freezing device (1), and a second index value calculated from data pertaining to the operation of the freezing device (1) in a second period that has a different length from the first period, and calculates the deviation degree from the normal state of the refrigerant circuit (20) on the basis of the first index value and the second index value. The determination unit (67) determines whether the refrigerant is leaking on the basis of the deviation degree from the normal state of the refrigerant circuit (20), or predicts the refrigerant leakage occurrence time.