| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide air conditioning equipment capable of manufacturing cold water only by a cooling tower even at an outside air wet-bulb temperature higher than a conventional one and lengthening a yearly free cooling operation time. <P>SOLUTION: When an outside air wet-bulb temperature becomes higher than a first set value, the control to operate a second refrigerating machine and a second cooling tower is performed by closing a first valve, a second valve and a third valve and opening a forth valve, when the outside air wet-bulb temperature becomes a second set value or more, lower than the first set value, the control to cool the cooling water of a cooling water circulation passage for free cooling in two stages, is performed by stopping the second refrigerating machine, opening the second valve and the third valve, closing the first valve and the forth valve, and communicating the cooling tower for free cooling and the second cooling tower in series, and further when the outside air wet-bulb temperature becomes lower than the second set value, the second cooling tower is stopped, the first valve is opened, the second valve and the third valve are closed, and the cooling water is carried to a heat exchanger through the cooling water circulation passage for free cooling. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
