Study Of Heat Distributing Coefficient In High-big Natural Ventilation Rooms

Natural ventilation is focused because it has many advantages, such as healthiness and saving energy. Ventilation efficiency of natural ventilation can be used to check validity of air distributing whether energy is made use of and nor, and affects air quality in the working zone. Ventilation efficiency is defined by t_p and t_n. T_p is obtained when designers are designing natural ventilation. T_p can be obtained from computing heat distributing coefficient. And heat distributing coefficient is correlated with many factors and is an important parameter to check effect of natural ventilation, so there are significances to study heat distributing coefficientFirstly, the paper is based on resembling foundation, and differential equation of temperature field and single condition in the natural ventilation room are analyzed and resembling rule that affects heat distributing coefficient is obtained, then it is used to guide numerical simulation so order to avoid blindness.The place for cultural or sports activities is studied in the numerical simulation and the software CFD is used to simulate each factor that effects natural ventilation coefficient under different conditions. In the course of simulation study, result that is independent of grid is obtained through it is fined repeatedly. Realizable k-ε model, DO radiation model and boussinesq model are used. Meanwhile, standard wall function is used, and inner heat resource load is distributed to the certain zone .Temperature field and velocity field under different conditions are obtained and analyzed, and some parameters are obtained from temperature field and velocity field of the room, and heat distributing coefficients are gotten from its defining relation, then relation between the factor and heat distributing coefficient and relation that the factor affects heat distributing coefficient are found out. Last, some suggests are presented so order that heat distributing coefficient of natural ventilation is practise in the practice and is more researched on.