推定プログラム、推定方法、および推定装置: JP 7215058 B2

PROBLEM TO BE SOLVED: To estimate the amount of a refrigerant flowing in a refrigerant system even when control of an air conditioner functions.

SOLUTION: An estimation device 100 acquires a temperature of a refrigerant in a target refrigerant system 110. The estimation device 100 calculates an estimation value of the amount of the refrigerant in the target refrigerant system 110 on the basis of a scaling index, a temperature of the refrigerant in the target refrigerant system 110 at a reference time point and the acquired temperature. The scaling index is an index corresponding to positive feedback related to refrigerant leakage amount in a refrigerant system having a common control content with the target refrigerant system 110. The control content is, for example, keeping the pressure of the refrigerant constant.