Abstract
1. In this time an electric computer was used for the calculation on the estimation of fire temperature-time curve in rooms under more complicated conditions. 2. Theoreticaly the basic equation of heat balance in the room should be inculuded the rate of heat loss Q_r which is necessary for the air in the room warmed up to the fire temparature. In the previous reports Q_r was assumed negligible small. The difference of calculation results between including of Q_r and neglecting of it is quite negligible small. It is concluded that the heat balance equation described in the previous reports can be used to obtain the precise results. 3. The rate of burning in a room having different height of windows can be estimated roughly by adding of the rate of burning of each window. 4. In the previous reports the decay lines were assumed 10℃/min and 7℃/min, after all combustible has burnt out, as a safty factor. But the calculation results in this time shows that the previous assumption has included an unreasonable safety factor too much and the decay line described in the previous reports should be eliminated. If the safety factor is necessary some safety duration time should be added to the obtained duration. 5. The temperature-time curve in a room which has several interior surface having different thermal property can be obtained roughly to use a mean values of thermal property weighted by the area. But it is convenient for the estimation of internal temperature of enclosure to calculate the thermal transmission at each enclosure slab. 6. Although many different curves are obtained under the given conditions of the rooms, the standerd temperature-time curve for fire test is only one. The eqvalent fire test duration correspond to the estimated curve can be roughly obtained by use the same temperature-time area upon 400℃ or 500℃.
