A Method For Calculation On Properties Of Fire Smoke Flow In Building And Application Software Compiling

The author make two modifications from the calculation model of smoke flow, which had put forward by professor Zhi-jun Yan:* Linearize the expressions of mass flow and pressure gap of opening. Establish smoke flow calculation model by unite the equations of mass balance, pressure balance and the linearized expressions of mass flow and pressure gap into linear equations.* In room temperature and smoke concentration calculation model, use recessive difference equations. To form the new model, firstly, the author establish smoke flow calculation model by unite the equations of mass balance, pressure balance and the linearized expressions of mass flow and pressure gap into linear equations. Secondly, via formulating heat balance of rooms and walls, the difference equations with the temperature of every room and wall node unknown can be derived. Then, the author establish room temperature and wall temperature calculation model. All the models above together build up a complete model for calculation on properties of fire smoke flow in building. On the basis of new model, by using MATLAB6.0 language, the author developed a computer program for calculation on the properties of fire smoke flow in building. The user of the program can modify the input data from the interface system of the program, so he can contrast with many different schemes of smoke control and management system. The result data of program can be described by graph. For example, it can create temperature-time curves of rooms and walls, concentration-time curves of room, mass flow-time curves of opening, and so on. By a comparison between the result data of this program and the data in the example of 'The Report of smoke control and refuge method research', which is written by Japanese Construction Association, it has been proved that the predictive calculation of this program is reliable.