THE EFFECT OF VENTILATION ON HUMIDITY CON DITIONS BY INTERIOR FINISH MATERIALS

Temperature and relative humidity in steel boxes (20 cm by 20 cm by 30 cm) lined with different interior finish materials which had an exhau st pipe and an inhalant pipe reaching to the bottom for ventilation on their upsides were measured, when the ambient temperatures and relati ve humidities were changed periodically. The extent of humidity condit ions in the box was evaluated using Slope B of a linear regression cur ve between the logarithm of the relative humidity and the temperature. The relationships among Slope B, the ratio A/V of the lined area A to the box volume V, and the times of ventilations for six kinds of mate rials were examined. The same relationships also were obtained for the boxes lined with a combination of three different materials whose A/V values; corresponded to those of the floor, wall, and ceiling of a si x-mat room. In the latter case, the B value of wood was determined fro m the sum of A/V values of wood equivalent to B values at respective A /V values of materials. The estimated values agreed well with the meas ured ones.