Abstract
A room heating method that uses an air conditioner together with a unique floor heating system is proposed. The floor heating system is composed of 32 polyethylene tanks with total water of 6726 and vinyl tube of 200m in length under the floor (10m^2). The water heated by solar collectors flowed though the tube. When two collectors with the total collector area of 4m^2 were used, the temperature of the floor surface became 2 or 3℃ higher than the room temperature at 22℃. When the operation of the air conditioner was off in the midnight, the floor temperature dropped, but it remained at 14℃ in the early morning when the ambient air temperature was 2℃.
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