The Research On Influence Of Centralized Heat-source On Temperature Field Of Ceiling Air Supply In Air-Conditioning Room

To realize indoor air distribution of temperature,humidity, wind speed and pollution is based on the good air flow form. In essence, to achieve the indoor air distribution and ventilation effectiveness, what depending on the interaction of momentum and heat-exchange between the indoor air flow and thermal convection, so that to achieve the indoor air cooling dehumidification and harmful gases, dust source with a room. In other words,to reach the mixed effects of indoor air, not only with the supply and exhaust, but also the indoor thermal diffusion conditions. In this paper, Through numerical simulation to research on influence of centralized heat on temperature field of ceiling air supply in air-conditioning room with change of centralized heat-source heat intensity, and location.At first, based on indoor air jet theory, air distribution typical models of heat source, and then established the physical model of air conditioning is combined action by four air supply outlets. A comparison of the results given by the numerical simulation and experiment data obtained from the work of H.B.AWBI in order to validate indoor ventilated circumstance,was taken to validate the three-dimensiond k-εtwo-equation turbulence model and SIMPLEC method. In addition, outlet model adopt the N-point momenturm model (N=4),by simplified the four-square diffuser,and contrast the sample data of manufacturer. In order to make the study universal applicability and intuitive, this dimensionless form are used, the location factor, said heat source position relative to the configuration of vents. On mathmatical model is validated,first studies the characteristics air distribution of the three typical heat-source models. Then simulated and analyzed the the influence of indoor air distribution because of interaction between on indoor thermal convection and supply air jet when the position variation, air jet momentum change underside of the centralized heat source mode, and using the non-uniform coefficient and comfort index indoor air distribution characteristics of ADPI) index (indoor environment evaluation.Through numerical simulation, the conclusion is that, for indoor air movement of up-supply down-return supply, giving the air in the cross section speed and cold quantity distribution non-uniform, resulting in concentrated heat source arranged in different positions relative to the outlet of the air dropped by the stronger jet Weak different, thus affecting the interior work area temperature uniformity. First, the linear simulation of heat distribution in the room, the heat source heat intensity and location factors on supply air jet attached to the length and uniformity of temperature. Further consideration of heat in the room scattered in different locations when the indoor temperature factor field distribution uniformity and indoor obtained heat equipment, personnel activity areas the scope of rational arrangement of the relative outlet. Maintaining the characteristic scale of the room and thermal conditions remain unchanged, will heat source arranged in the most advantageous position, by changing the outlet size, to analyze the distribution of indoor air and the jet momentum of the relationship between the jet momentum obtained under different meet the range of regional temperature fluctuations.