ZONAL MODELING OF HOT ROOMS
When we study physical parameters of hot rooms, experiments verify that there is an apparent phenomenon of thermal stratification in vertical direction. It is especially true for tall big spaces. So in our study, a whole space can be divided into several layers, physical parameters (temperature, pressure, harmful gas’s concentration, etc.) of each layer can be considered to be relatively stable and identical. Heat and mass are exchanged among each layer or among layers and external surroundings by limited potential differences. This may be called a “lumped parameter method which provides a way of understanding indoor air quality. Based on this basic idea of zone simulation, this paper analyzed heat and mass characteristics of two types of hot rooms and established their equilibrium models--two sets of ordinary differential equations. Models synthesized processes of heat release, entrainment, plume, air flows of openings. In these equations, variables were only functions of time, but affected mutually. Stiff problems of these equations could not be evitable, because several time constants different in dimension existed there. A Gear algorithm was adopted, which was just used to solve stiff problems. According to this algorithm, two VC++ programs were written and operated. Results of pressure and temperature of each zone and zone’s interface height were plotted in rectangular coordinates. By comparison of these results with those obtained from CFAST software, Merits and demerits of this model were analyzed.
zone model plume stiff problems Gear algorithm.
Yan TONG M H.SHI J P.HE
College of Energy and Environment, the Southeast University.College of Urban Construction and Safty College of Energy and Environment, the Southeast University The Nanjing university of technology
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）