TURBO REFRIGERATOR MAXIMUM LOAD FACTOR CALCULATION DEVICE, CALCULATION METHOD THEREIN, HEAT SOURCE SYSTEM, AND METHOD FOR CONTROLLING THE NUMBER OF TURBO REFRIGERATORS

摘要

PROBLEM TO BE SOLVED: To calculate the maximum load factor at a present operation point by using general information usually used for control operation of a turbo refrigerator.SOLUTION: A refrigerator control device 10a comprises a data acquisition part 41, a memory part 42, and a computing part 43. The data acquisition part 41 acquires a cold water outlet set temperature and a cooling water inlet temperature as input data. The memory part 42 stores computing expressions including the cold water outlet set temperature and the cooling water inlet temperature of the turbo refrigerator as variables and including a rated cold water outlet temperature, a rated cooling water outlet temperature and a rated cooling water inlet temperature as fixed parameters. The computing part 43 calculates the maximum load factor that the turbo refrigerator can output at a present operation point by applying the cold water outlet set temperature, cooling water inlet temperature, pre-set rated cold water outlet temperature, rated cooling water outlet temperature and rated cooling water inlet temperature of the turbo refrigerator acquired by the data acquisition part 41 to the computing expressions stored in the memory part 42.