Numerical Study On Indoor Therminal Environment Of Impinging Jet Ventilation System In Winter Operating Mode

In recent years, as the development of the level of people's life, central air condition system became more and more popular, especially that the buildings which use air condition system in winter are increasing. And now the air distribution of ventilation strategy which have been usually used are designed according to the summer outdoor parameters. Thus, in winter, the hot air will arise with the influence of buoyancy, which can cause some influence in thermal comfort and the energy utilization efficiency, it is necessary that do some research on the air distribution of the air conditioning room in winter, analysis the corresponding thermal comfort, in accordance with the existing air conditioning design propose improvement measures, and make it meet the use requirements of winter without having some influence in summer at the same time.Based on the previous studies, here we aimed at the impinging ventilation system of one air conditioning room with changes in the floor height,the location of air supply outlet and various return air system, performing in numerical simulations. The influence of these factors on the indoor air diffusion, temperature field, ventilation efficiency and no-uniformity coefficient were studied. Compare and analysis the temperature and wind speed in the plane of people's ankle and breath and the temperature and wind speed through the height of the room.The results reveal that when the location of air supply outlet is in the middle of the room, the average temperature and the micro-injection distance are decreasing with the increase of the floor height, the temperature difference of sags are increasing and when the floor height is high, the influence of various return air system is more significantly. Various return air system have the smallest influence when it is upper side part various return air system.When air supply outlet is in the middle of the wall, the wind speed of ankle plane have the smallest changes and the lightest feeling of the wind. When air supply outlet is in the corner, the average temperature is highest. The no-uniformity coefficient was small in the three locations of air supply outlet.