Thermal radiation field in a room with electric floor heating was investigated by experiments using a cubic net radiometer. The surface temperature of the floor was set at a high temperature of 50 degree centigrade at the highest, for the sake of conducting an evaluation method of thermal environment in the room with floor heating. The height of measurement was selected at 50cm above the floor corresponding to the posture of a human body sitting on the floor. Using the cubic net radiometer made it possible to analyze the variation of thermal environment in the room owing to the directionality of the instrument.
