Study On The Diffusion Of Pollutants In Indoor Multi-zone Under Natural Ventilation

Building energy consumption plays a significant role in China's energy consumption.As the energy problem becomes more and more serious,people's attention to building energy consumption is increasing.In order to reduce the energy consumption of air-conditioning and other equipment in daily life,it is very important to develop natural ventilation in architectural design.Reasonable natural ventilation can drive indoor air flow,adjust indoor temperature and humidity,and improve indoor environment;The indoor pollutants can also be discharged outside to ensure the indoor air quality.At the present stage,CFD?Computational Fluid Dynamics?technology is one of the main means to study the indoor environment of buildings relying on its low cost and fast speed.In this paper,the experiment platform had been set up in the building environment lab of Hefei University of Technology,with the help of wind wall system to provide the stability of the outdoor wind environment,measurement indoor velocity field under different inlet velocity.On this basis,use FLUENT software to carry on the numerical simulation,verify the accuracy of the numerical simulation through comparing measured data with the simulation results.On the basis of verifying the accuracy of numerical simulation,the problem of pollutant diffusion in indoor multi-area under natural ventilation is further studied.With toluene?C₇H₈?as the research object,numerical simulation is carried out for the different working conditions of different inlet position,open the window way,pollutant source term.The differences between the indoor velocity field and the concentration field under different working conditions are analyzed,and the distribution of flow field and the diffusion of pollutants in different working conditions are summarized.The following conclusions are drawn:?1?When the inlet wind speed exceeds a certain range,it will no longer have a significant effect on indoor pollutant diffusion;However,with the increase of the inlet wind speed,the average wind speed of each room in the room increases,which may produce a"blow feeling",which cannot meet the requirements of comfort.?2?In the case of indoor pollution sources,in order to get indoor pollutants out of the room,the opening area of the windward should be increased as far as possible?open multiple Windows or open the window to the maximum?.?3?When the pollution source is located in the room where the windward side is located,the pollutant will spread to the room in the leeward side with the air flow;But when the source of pollution is located in a room on the leeward side,the pollutants are spread out directly through the window of the room,rather than through the inner door of the room.