Heat source system, and device and method for controlling cooling water supply device

A device for controlling a cooling water supply device which includes a cooling tower and supplies cooling water to a condenser of a chiller, comprising:

• an equipment controller configured to:
• acquire a cooling water outlet temperature lower limit setpoint which is determined in accordance with a set temperature for a chilled water outlet in the chiller, from the chiller;
• determine a cooling water inlet temperature lower limit setpoint using the cooling water outlet temperature lower limit setpoint and the load of the chiller;
• compare a cooling water inlet temperature lower limit value determined from an outside wet-bulb temperature and the cooling water inlet temperature lower limit setpoint, and for setting the higher one as a cooling water inlet temperature setpoint;
• and
• generate a control command for a cooling tower fan and a control command for a cooling water flow rate, so as to match a cooling water inlet temperature and a cooling water outlet temperature respectively with the cooling water inlet temperature setpoint and the cooling water outlet temperature lower limit setpoint.