Experiments were carried out to determine the effect of an underfloor air-conditioning system on comfort. The four factors evaluated were the type of outlet, the distance between the outlet and the occupant, the velocity of the supply air, and the temperature of supply air. It was found that the distance between occupant and outlet has a significant influence on thermal comfort, the velocity and temperature of the supply air have a moderate influence, and the type of outlet has little influence. Recommended values of these factors were developed that would achieve thermal comfort. The results provide reference data on air distribution in underfloor air-conditioned rooms.
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