This is due to the fact that the heat capacity of the walls is not the thermal capacity of the building, but only the capacity of the walls to transfer the heat to the surrounding air.Ĭalculating the mass flow rate of dry air It is important to note that the wall capacity of the building is more than the sum of the heat capacities of the walls in contact with the air. This limit is called “heat capacity of the wall” in this paper, and can be estimated through Eq. The thermal energy of the building is then dissipated through the walls of the building. At the end of this period, the thermal energy is transferred from the building to the surrounding air. (2) In the early stages of the fire, the thermal energy is transferred to the building through convective heat transfer. The heat transfer from air to building is therefore not linear, and is limited to the convective transfer, with a time constant equal to the thermal capacity of the building. However, in the early stages of the fire, when the thermal energy of the building is still very high, the temperature in the building is still far from the equilibrium.
(1) The linear assumption, which is valid for high-temperature fission, indicates that at time 0 the building is in equilibrium and that this initial condition can be considered as linear. This difference between predicted and observed values is due to the fact that: (1) the model is only valid for a linear assumption and (2) the model considers the limited time of heat transfer in the room. There is a great difference between observed and predicted values at time 0 and the following times. This behaviour can be assigned to the onset of high-temperature fission. Reprinted by permission of the publisher.
0 kommentar(er)
