Abstract
For the purpose of obtaining the fundamental data to establish the ventilating requirement in the bathroom, investigated are the comfortability of occupant in a bathroom, the hour for drying the bathroom after taking a bath and the hour for drying the washed cloths hung in the bathroom, related to the ventilating rate by using a real bath unit. The results are as follows. 1) In winter season, the naked person becomes to feel cold 2 to 3 minutes after going out from a bathtub, even if the ventilating rate is zero. Therefore, the ventilating requirement when a person is taking a bath, should be zero or less than 20m^3/h (6 air change rate) for preventing the vapor from going out of a bath unit. As for the type of air inlet of a bath room, the slit type opened on the top or side of the door is better than the louver type used at present from the viewpoint of comfortability. 2) In summer season, the naked person feels comfort when the ventilating rate is 100 to 140 m^3/h. 3) The hour for drying a bathroom is related to the volume of condensed vapor and the ventilating rate. When the ventilating rate is a constant, the relation between the hour for drying a bathroom and the volume of condensed vapor is linear. When the volume of condensed vapor is 140g, the relation between the minute (y) for drying a bathroom and the ventilating rate (x) is approximated by the following formula : y=1920/x+25 If the number of persons taking a bath is 2 to 3, it should take 90 to 120 minutes to dry the bathroom at the ventilating rate of 100 m^3/h under the consideration of the water remained on the floor. 4) The hour for drying the washed cloths hung in the bathroom, is related to the ventilating rate, heating or not, and the hanging position of the washed cloths. When the ventilating rate increases from 50 to 100 m^3/h, the hour for drying the washed cloths decreases to 70〜80%. When the bathroom is heated by the electric heater of 0.6kW, the hour for drying decreases to 60〜80%.
