Method for controlling air conditioner, air conditioner, and environmental tester

A method for controlling an air conditioner which conditions air sucked from closed space through an air inlet, and then discharges the conditioned air to the closed space through an air outlet, thereby controlling a state in the closed space to a predetermined target state, the method comprising:

• setting a target value for controlling a physical quantity representing the state of the closed space;
• first measuring the physical quantity of the air discharged through the air outlet, or sucked through the air inlet over time;
• second measuring the physical quantity over time at least one position in the closed space which is not near the air outlet and the air inlet;
• first calculating a moving average of measurements of the physical quantity obtained at a specific position, which is the air outlet or the air inlet, in the first measuring;
• second calculating a moving average of measurements of the physical quantity in the closed space obtained in the second measuring;
• calculating a correction amount by subtracting the moving average of the measurements of the physical quantity obtained at the specific position from the moving average of the measurements of the physical quantity obtained in the closed space;
• adding the calculated correction amount to the physical quantity measured in the first measuring to calculate a physical quantity for control, and
• controlling the air conditioner in such a manner that the physical quantity for control is the target value.

An air conditioner comprising:

• an air conditioning part which conditions air sucked from closed space through an air inlet, and discharges the conditioned air to the closed space through an air outlet;
• a sensor for measuring a physical quantity at different positions in the closed space;
• and
• a controller for controlling the air conditioning part based on measurements of the sensor in such a manner that a state in the closed space is a predetermined target state, wherein
• the controller includes:
• a setting section for setting a target value for controlling the physical quantity based on an input signal;
• a calculating section for calculating a moving average of the measurements of the physical quantity measured at each of the different positions;
• and
• a controlling section for controlling the air conditioning part in such a manner that a median between the maximum value and the minimum value of the plurality of calculated moving averages is the target value.

An environmental tester comprising:

• a test chamber in which a specimen is placed;
• an air conditioner which conditions air sucked from the test chamber through an air inlet, and discharges the conditioned air to the test chamber through an air outlet;
• a sensor for measuring a physical quantity at different positions in the test chamber;
• and
• a controller for controlling the air conditioner based on measurements of the sensor in such a manner that a state in the test chamber is a predetermined target state, wherein
• the controller includes:
• a setting section for setting a target value for controlling the physical quantity based on an input signal;
• a calculating section for calculating a moving average of measurements of the physical quantity measured at each of the different positions;
• and
• a controlling section for controlling the air conditioner in such a manner that a median between the maximum value and the minimum value of the plurality of calculated moving averages is the target value.