Patent attributes
An air-conditioning and ventilation apparatus includes an air-conditioning coil that is installed on a downstream side of a heat exchanger in a supply air trunk and changes cooling capacity with respect to heat-exchanged outdoor air in multiple stages; an outdoor-air temperature and humidity sensor that detects temperature and relative humidity of the outdoor air; and a control unit that stores therein reference data in which the cooling capacity is set for each combination of temperature and relative humidity of the outdoor air such that absolute humidity of supply air becomes equal to or lower than indoor target absolute humidity on the basis of a dehumidification load corresponding to an absolute humidity difference between indoors and outdoors, and determines a cooling capacity value of the air-conditioning coil on the basis of detection results during a cooling operation by the outdoor-air temperature and humidity sensor and the reference data.
