| 摘要 |
PURPOSE:To improve an efficiency and a performance to control temperature for the condenser, by increasing and decreasing the operating number of fans in accordance with the load to a condenser being detected by a condensate temperature detector and a temperature controller, in the condenser of indirect air-cooling type to which a plurality of variable pitched fans are provided. CONSTITUTION:Variable pitched fans 11A and 11B are provided to a condenser, and the limit of operation to the operation load is determined by an allotted range which each variable pitched fan 11A and 11B shares in. With the condenser so arranged that the primary variable pitched fan 11A is operated in accordance with the load detected by a temperature detector 6 and a temperature controller 8, for example, to the operation load within the limit of 0-70%, and when the operation load is further increased, then a variable pitched fan 11B is also brought into operation. When the operating load is decreased, the operation of the fans are decreased accordingly. Thus, the temperature control to the condenser of indirect air-cooling type can be controlled effectively with high controllability. |
