The Measurement And Numerical Simulation Of Tall Industrial Plant In Hot Authentic Tunnel Ventilation

In recent years, building ventilation energy consumption has become a strategic issue in the process of China’s national economy and social development to be solved. Among them, the energy consumption of industrial type buildings occupy large of total energy consumption in the economic and social proportion, especially in a large space industrial plants with high heat produced by the process of production operations energy consumption is accounted for about 70%. As people awareness of indoor thermal comfort requirements and sustainable green energy saving, they attent to tunnel ventilation authentic approach has been widely used in industrial plants. It can improve air quality and thermal comfort inside the plant requires a large work area, and significantly reduce the energy consumption required ventilation industrial plants. In the research focusing on the question of tunnel ventilation under the thermal pressure for the tall industrial plants, the author found that the problems of the thermal comfortable environment in the workplace and the issues of ineffective ventilation in the underground duct are widespread after field tests and subjective survey for a typical large space industrial plants in Wu Han. For example, the air temperature of the place where is close to the heat source of the work area is up to 55℃, and the import ventilation rate of the cenote is obviously insufficient. These problems have a serious effect for the process of productivity and workers exposed to physical and mental health. Meanwhile, after a field survey research, the author found that the energy consumption of ventilation of such a tall industrial plant is quite big for a long time.To solve the issues of the ventilation of such a big industrial plants and the thermal comfort of the workspace’s environment, by the way of the field test and numerical simulation technology, the combination of a tall space industrial buildings and the tunnel ventilation system in Wu Han area as the research object, CFD prediction model for tunnel ventilation system was established considering the buoyancy-driven effect. Independence and turbulence models, physical models to predict the effectiveness of meshing to sexual and field data were rigorous and comprehensive analysis of comparative verification. Aad then, use the prediction model to study how the tuyere area ratio, the outdoor ambient temperature and two heat dispersion degree pitch to affect such big industrial plant tunnel ventilation. For the purpose of improving the thermal environment of the plant room workspace comfort issues, obtained district workspace thermal environment and ventilation air flow and other data related to the numerical simulation. At same time, considering the typical characteristics of authentic tunnel ventilation of industrial building, the author further studies these two important factors influencing authentic natural ventilation system ventilation airflow, which contain the length of ventilation system in the shaft tunnel and the height of the cenote. Finally, to control and reduce the energy consumption of the thermal pressure tunnel ventilation such a industrial workshop as the objective, the author puts forward the technical guidance and the optimized method of energy conservation of the ventilation of the underground tunnel, which were typical form of ventilation used in industrial construction.The study found that when the inlet and outlet area ratio reaches 0.9, the average temperature has dropped workshop workspace below 305 K, ventilation plant will also tend to value; With the increase in the dispersion of heat source spacing, plant and gradually reduce the amount of ventilation, work area air temperature gradually increased average; When the local channel length by 60 m to 200 m, authentic gradually increases to a maximum amount of ventilation 18.7 kg ?s-2, the air temperature at the outlet of the tunnel and the work area average air temperature will decrease linearly; When the shaft height is further increased to 4.5 m, the air temperature at the exit of the tunnel will not change, the amount of ventilation tunnel will reduce, a slight increase in the average temperature of the work area.