Abstract: An air-conditioning apparatus includes a fan to send air to an air-conditioned space through a duct, a current measurement unit to measure a value of a current applied to a motor as a motor current, an inlet temperature measurement unit to measure a temperature of air flowing into the duct as an inlet temperature, and a controller to control the fan. The controller includes a memory storing current characteristic data associating the motor current and a rotation frequency of the motor with an external static pressure. The controller performs a correction process based on the inlet temperature to the motor current to obtain a control current, estimate the external static pressure by comparing the obtained control current and the rotation frequency of the motor with the current characteristic data, and control a rotation frequency of the fan, on the basis of the estimated external static pressure.

Abstract: An air-conditioning apparatus includes a fan configured to send air to an air-conditioned space through a duct, a current measurement unit configured to measure a value of a current applied to a motor as a motor current, an inlet temperature measurement unit configured to measure a temperature of air flowing into the duct as an inlet temperature, and a controller configured to control the fan. The controller includes a memory storing current characteristic data associating the motor current and a rotation frequency of the motor with an external static pressure. The controller is configured to perform a correction process based on the inlet temperature to the motor current to obtain a control current, estimate the external static pressure by comparing the obtained control current and the rotation frequency of the motor with the current characteristic data, and control a rotation frequency of the fan, on the basis of the estimated external static pressure.