| 摘要 |
PURPOSE:To dispense with a drain tank by a method wherein the relative humidity of the air at the outlet of a cooler is detected and the flow rate of the refrigerant in the cooler is controlled, and the signal from a humidity sensing means is read and a refrigerant flow rate-controlling means is controlled. CONSTITUTION:The relative humidity of a current of air ejected from a cooler 4 is measured by a humidity sensor 8 provided at the outlet; the flow rate of the refrigerant is controlled in such a manner that, when the relative humidity is lower than the prescribed value, a valve 7 is given an open instruction, whereas when the relative humidity is higher, the valve 7 is given a closing instruction. As a result, the temperature of the air flowing through the cooler is kept in a range in which the moisture in the air does not condense and therefore there is no need for equipment for disposal of drain. In other words, by automatically adjusting the valve opening of the refrigerant flow rate-controlling valve 7 the evaporating pressure and the evaporating temperature of the refrigerant are so controlled as to keep the relative humidity of the air at the outlet of the cooler is as close to 100% RH as possible on the basis of the signal from the humidity sensor 8. Independent of the condition of the air A at the inlet of the cooler this method keeps the surface temperature of the heat exchanger coil in the cooler 4 above the dew point. |
