Experimental And CFD Study On The Flow Field Of Displacement Ventilation

The indoor climate not only strongly affects human health and life quality, but also their productivity and work efficiently. Numerous problems of indoor climate are associated with indoor air distribution. Displacement ventilation (DV) as a new ventilation style, compared with traditional ventilation, has showed several remarkable advantages on many occasions. However, the research of displacement ventilation has just been carried out in China. To profound understand the effects of influencing factors on thermal indoor climate can help us know displacement ventilation system well.The main aim of this paper is to research the effect of supply air parameters and ambient parameters on the flow field, temperature field and thermal comfort in DV room. Computational Fluid Dynamics (CFD) has been used to predict the flow field of given DV system, the distribution characteristics of temperature, velocity, contaminations and thermal comfort has been discussed.Then, experiments have been carried out for the given problem. The vertical temperature distribution and temperature around the person under different supply air parameters and ambient parameters are obtained. The comparison between numerical results and experimental results show a good agreement, which means the CFD method used in this problem seems feasible. The effect of these influencing factors on indoor air temperature has been analyzed base on the numerical and experimental dates. We found that:I . As the supply air flow volume increases, the vertical temperature gradient become lower, and also was temperature difference between head and ankles.II. The supply air temperature influences the room temperature, but not the vertical temperature gradient.III. The ambient temperature influences the vertical temperature gradient. But the effect of it on upper zone seems larger than on lower zone.