Heat-source system and method for controlling the same

Abstract

A heat-source system includes centrifugal-chillers, cooling-water pumps, cooling towers, cooling-tower fans, chilled-water pumps, and a control unit for controlling them. A plurality of the cooling towers are provided so as to have a cooling-tower capacity corresponding to the total capacity of the rated capacities of the respective centrifugal-chillers, the cooling towers being commonly connected to the plurality of centrifugal-chillers. The control unit preliminarily prepares an optimum cooling-tower capacity relationship representing the cooling-tower capacity with which the heat-source system efficiency, taking into consideration the centrifugal-chillers, the cooling-water pump, the cooling towers, the cooling-tower fan, and the chilled-water pump, is higher, in relation to the outside-air wet-bulb temperature and the centrifugal-chiller partial load factor. The control unit determines the number of cooling towers to be operated by referring to the optimum cooling-tower capacity relationship, on the basis of the outside-air wet-bulb temperature and the partial load factor of the centrifugal-chillers during operation.

Description

technical field [0001] The present invention relates to a heat source system that improves the overall efficiency of the heat source system and a control method thereof. Background technique [0002] As a heat source system used in cold water supply or district cooling and heating facilities in semiconductor factories, there is known a system including a plurality of turbo chillers that can be started and stopped according to the heat demanded by an external load. The heat source system includes, in addition to the turbo refrigerator, a cooling water pump for supplying cooling water to the condenser of the turbo refrigerator, and a system for cooling the cooling water heated up by recovering condensation heat from the condenser with the outside air. A cooling tower and a chilled water pump that supplies chilled water cooled by the evaporator of the turbo chiller to an external load. In addition, a cooling tower fan for introducing outside air into the cooling tower is provi...

AI Technical Summary

Problems solved by technology

If the cooling water temperature drops, the power consumption of the turbo chiller can be reduced and the efficiency can be expected to increase

On the other hand, if the number of activated cooling towers is increased, the power consumption of the cooling tower fans will increase, so it is conceivable that the overall efficiency of the heat source system will decrease.

Alternatively, it is also conceivable to increase the overall efficiency of the heat source system by reducing the power consumption of the turbo refrigerator instead of relatively reducing the increase in the power consumption of the cooling tower fan.

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