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

Claim 0:
1. A state estimation apparatus comprising:
a communication interface that receives current information from a current sensor measuring a current at a power supply part of a refrigeration/freezing facility;
a current information storage;
a processor;
a memory storing program instructions executed by the processor; and
a display, wherein the processor is configured to:
store current information of the refrigeration/freezing facility acquired in a state where a filter of the refrigeration/freezing facility is clean and current information of the refrigeration/freezing facility acquired one or more times at a predetermined time interval before state estimation is practiced in the current information storage;
calculate 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;
determine 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
output the determination result on the display.