Air conditioner

A radiation temperature calculating method comprising:

• detecting, with an infrared sensor, a temperature of an area of a room by scanning the area;
• acquiring, with a microprocessor, thermal image data of the area scanned by the infrared sensor;
• calculating, with the microprocessor, from the acquired thermal image data, a temperature T_left of a left wall located on a left side when viewed from the air conditioner, a temperature T_front of a frontal wall located in front of the air conditioner, a temperature T_right of a right wall located on a right side when viewed from the air conditioner, each of the left wall, the frontal wall, and the right wall being a wall of the room, a temperature Tf. ave of a floor of the room, a distance X_left between the left wall and an installation position of the air conditioner, a distance Y_front between the frontal wall and the installation position, and a distance X_right between the right wall and the installation position;
• detecting, with the microprocessor, a human body present in the room from the acquired thermal image data;
• calculating, with the microprocessor,
• T_calc
• =
• Tf
• .
• ⁢
• ave
• +
• 1
• α
• ⁡
• [
• T_left
• -
• Tf
• .
• ⁢
• ave
• 1
• +
• (
• Xf
• -
• X_left
• )
• 2
• ]
• +
• 1
• β
• ⁡
• [
• T_front
• -
• Tf
• .
• ⁢
• ave
• 1
• +
• (
• Yf
• -
• Y_front
• )
• 2
• ]
• +
• 1
• γ
• ⁡
• [
• T_right
• -
• Tf
• .
• ⁢
• ave
• 1
• +
• (
• Xf
• -
• X_right
• )
• 2
• ]
• where T_calc is a radiation temperature, from the wall and the floor of the room for the human body, Xf is an X coordinate indicating a position where the human body is detected in a right and left direction of the room when viewed from the air conditioner, Yf is a Y coordinate indicating the position where the human body is detected in a depth direction of the room when viewed from the air conditioner, and α, β, and γ are correction coefficients;
• and
• controlling at least one of an air outlet temperature, an air outlet direction and an air outlet volume based on the calculations.