Analysis Of The Impact Factors Affecting Airflow Morphologies And Features Of Impinging Jet

Air conditioning systems heating in winter are commonly used hot summer and cold winter areas of china. However, summer airflow conditions system is generally used in ventilation and air conditioning. Due to thermal buoyancy effects, the heat of the air supply distributed in the upper space of the room. And as a result, it reduces the energy efficiency of hot air and indoor thermal comfort. So it is necessary to do research on indoor air-flow in air-conditioned rooms in winter form. Analyzing the indoor thermal comfort of the human body and suggesting improvements for the existing air-conditioning design. So that it not only affects the cooling effect in summer, but also meet the requirements in winter to.Based on the previous studies, here we aimed at the impinging ventilation system of one air conditioning room with a variety of conditions like Room geometry, Air duct, Outlet and return air location and different air flow parameters, performing in numerical simulations. The influence of these factors on the indoor air diffusion, personnel thermal comfort and ventilation efficiency were studied. And focus on the factors that influenced. Compare and analysis the influenced factor’s 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 results showed that the conditions such as Duct internal roughness, Room storey and Outlet position have a very small impact on indoor Velocity field, temperature field and thermal comfort. But inlet height, Duct settings along the column, different geometric shape of the outlet, inlet sizes and flow parameters of the air influenced a lot.After the increase in outlet height, air diffusion distance was shortened, the diffusion area is reduced, the air velocity near the ground is reduced. Hot air rising position is closer to the top. And increasing outlet height will increase the of the internal outlet flow diffusion region near the effective temperature difference value greater than2K, produce more heat discomfort.When the duct is arranged on both sides of the column, Flow diffusion distance run farther along the ground in X direction, But flow velocity diffusion distances is the same while airflow ground diffusion distance is shorter in Y direction. The both sides arrangement condition have a smaller impact on the room temperature in Y direction. And diffusion region have a more significant temperature stratification while the vast majority of the space in the lower room temperature.Different geometries outlet will affect ground diffusion region form. And special appearance (such as diamond outlet) will significantly reduce air diffusion distance. Indoor air temperatures has a more uniform distribution in square outlet while the heat cannot be fully exchanged in the diamond-shaped outlet conditions, and as a result, enlarge the temperature difference between Diffusion region and the external space increases. This is harmful to take full advantage of the indoor heat, improve comfort room personnel.Maintaining a constant air velocity increased outlet area will increase ventilation. Diffusion distance increases, the average temperature in the diffusion zone and the internal temperature will be increased, and the temperature stratification enhanced. Remaining airflow unchanged while increase the outlet size will increase air velocity decreases, and thus reduce the flow of air from the diffusion distance. Holding air velocity speed constant while increasing airflow outlet area will significantly increase the effective of temperature difference, and maintaining outlet air velocity constant while increasing the outlet area will increase the general area and the diffusion zone room temperature, the heating effect is reduced.When there are outlets nearby, the impact of their velocity field, temperature field and the effective temperature difference distribution works when diffusion flow contacts with each other, and affection only limited in the contact area. Internal diffusion region and the general area of the room will not be affected.