Abstract: A dew point temperature sensor detects and sends the dew point temperature of the supply air to a dry area, as a supply air dew point temperature, to a controller. The controller has a speed of rotation of the regenerating side fan (the regenerating air flow rate) to control, and determines a control value (the regenerating air flow rate) that causes the supply air dew point temperature to go to a target dew point temperature, and determines a supply air processing pre-cooling coil exit temperature setting value in accordance with this control value (where if the control value is in the direction of reducing the regenerating air flow rate, the supply air processing pre-cooling coil exit temperature setting value is increased). Note that what is controlled is the speed of rotation of the desiccant rotors, or the exit temperatures of the air heated by the hot water coils.

Abstract: A dew point temperature sensor detects and sends the dew point temperature of the supply air to a dry area, as a supply air dew point temperature, to a controller. The controller has a speed of rotation of the regenerating side fan (the regenerating air flow rate) to control, and determines a control value (the regenerating air flow rate) that causes the supply air dew point temperature to go to a target dew point temperature, and determines a supply air processing pre-cooling coil exit temperature setting value in accordance with this control value (where if the control value is in the direction of reducing the regenerating air flow rate, the supply air processing pre-cooling coil exit temperature setting value is increased). Note that what is controlled is the speed of rotation of the desiccant rotors, or the exit temperatures of the air heated by the hot water coils.

Abstract: A moisture exchange status monitoring device is provided. The moisture exchange status monitoring device is provided with: a temperature difference detecting portion; an evaluating portion; a setting value storing portion; and an evaluation result outputting portion. The temperature difference detecting portion detects a temperature difference ?t in the air on the treating side before and after passing through a desiccant rotor. The evaluating portion receives the temperature difference ?t from the temperature difference detecting portion and compares the temperature difference ?t to a setting value ?tth that is stored in the setting value storing portion, to evaluate the status of moisture adsorption of the moisture from the air on the treating side of the desiccant rotor. The evaluation result outputting portion outputs the evaluation result for the status of moisture adsorption, from the evaluating portion, as the monitoring result for the status of exchange of the moisture of the desiccant rotor.

Abstract: The present invention provides a dew point temperature sensor, detects a dew point temperature of supply air that is supplied to a dry room (i.e., the dew point temperature of process side dried air cooled by a cold water coil), and supplies such to a control apparatus as a supply air dew point temperature tdpv. When the supply air dew point temperature tdpv decreases, the control apparatus lowers the rotational speed of a regeneration side fan and a motor (i.e., a motor that drives a desiccant rotor). Furthermore, the dew point temperature of return air and the like may be detected instead of the dew point temperature of the supply air. In addition, the rotational speed of the regeneration side fan alone may be lowered. In addition, the present invention may be of a type that does not comprise the cold water coil or of a type wherein the return air does not return to the process side air.