| 摘要 |
<p>PURPOSE:To inexpensively feed air with a constant dew point by a method wherein the dew point of air is controlled so as to become lower than a steady supply dew point at the starting time of operation using a dry dehumidifier and the air is supplied, while the humidification thereof is controlled and the control of a dew point is changed over to the direct dew point control only due to the dry dehumidifier when operation becomes a steady state. CONSTITUTION:The dew point of air due to dehumidification using a dry dehumidifier 3 is controlled so as to become lower than a steady supply dew point, before a dryer 1 reaches a steady state after the starting time of operation and this air is humidified by a humidifier 4 on an air supply side to be supplied while controlled to the steady supply dew point. When a dried state becomes a steady state, the steady dew point control is changed over to the direct dew point control only due to the dry dehumidifier 3. As a result, even when a dry dehumidifier dull in control response is used, the constant dew point control of drying air can be ensured until reaching a steady state from the point of time immediately after the start of coating and constant dew point air supply can always be carried out in reduced operation cost.</p> |
