| 摘要 |
PROBLEM TO BE SOLVED: To predict generation of surge in turbofreezer accurately without increasing the machine and an equipment cost by using a generally provided measuring instrument. SOLUTION: A differential pressureμ0 is obtained from an outlet pressure 7a and an inlet pressure 8a of the turbofreezer. A converted wind volumeΦ' is calculated with the inlet pressure 8a, an inlet temperature 10a, an electric motor current 11a, and the differential pressureμ0 of the turbofreezer. A serge curve S of the turbofreezer is determined based on the relationship between the converted wind volumeΦ' and the differential pressureμ0. By inputting the calculated converted wind volumeΦ' for the surge curve S, a surge generating differential pressure X at a given converted wind volumeΦ' is obtained. The generation of surge is predicted by comparing the surge generating differential pressure X and the differential pressureμ0.
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