Patent ID: 11865483
Assignee: NEC CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC B  F  A | IPC A  B  F

Claim 8:
9. A non-transitory computer-readable medium storing a program that causes a computer to execute processing comprising:
receiving current information from a current sensor that measures current at a power supply part of the refrigeration/freezing facility;
storing in a current information storage current information of the refrigeration/freezing facility acquired in a state where the filter of the refrigeration/freezing facility is clean after the filter has been cleaned and current information acquired one or more times at a predetermined time interval after the filter is cleaned and before state estimation is practiced;
calculating a correlation value between the current information acquired at a state estimation practice time point and the current information acquired before the estimation practice time point retained in the current information storage;
determining whether or not cleaning of the filter of the refrigeration/freezing facility has been practiced, between the state estimation practice time point and one previous state estimation practice time point, based on a degree of change at least between the correlation value calculated at the state estimation practice time point and a correlation value calculated at the one previous state estimation practice time point; and
outputting the determination result on the display.