Refrigerant leak detection device and refrigerant leak detection method

摘要

PROBLEM TO BE SOLVED: To prevent a decrease in accuracy of refrigerant leakage determination using multivariate statistical process management. SOLUTION: For multivariate statistical process management using an operation data acquisition unit 41 that acquires a plurality of time-series operation data related to cold equipment and a normal operation data D1 acquired by the operation data acquisition unit 41. Based on the model generation unit 43 that generates the model D2 in the normal state, the operation data of the detection target period ΔT1 acquired by the operation data acquisition unit 41, and the Q statistics obtained based on the model D2 in the normal state. The determination unit 47 for determining the refrigerant leakage of the cold equipment is provided, and the model generation unit 43 acquires the operation data in the model generation period ΔT2 for creating the model D2 in the normal state and within the model generation period ΔT2. If there is a pull-down that exceeds the pull-down time threshold, the operation data for the predetermined deletion period before and after the pull-down is deleted, and the deleted operation data is used as the normal operation data D1. do. [Selection diagram] Fig. 1