Numerical Simulation Of Velocity And Temperature Field In An Air-conditioned Room

This paper is an application of Computational Fluid Dynamics in the turbulent flow of a three-dimensional air-conditioned room in which there are heat sources. Based on the theoretical analysis of mathematical and physical model, room airflow velocity, temperature and the law of heat exchange on the condition of the forced convection are studied when the location, height and number of diffuser are different. At the same time, air diffusion performance index (ADPI) is used to evaluate the indoor air distribution. The k-ε two-equation turbulence model, staggered grid method and SIMPLEST method are adopted to simulate indoor airflow. The effect of buoyant force on k - ε model and radiation of human body are also considered. The k-ε model linked with the wall function is applied to the boundary condition, and a simplified human body model is adopted when radiation is considered. CFD software PHOENICS is used to simulate the model. The results of numerical simulation are expressed intuitively by post-process tools, and are also analyzed and compared with each other. The results prove that k-ε turbulence model in the numerical computation to the airflow of non-isothermal room is feasible. The numerical simulation can help man to predict the effect of the airflow organization. It can also increase the level of the designing project of airflow organization. There is great importance in assuring good effect of air-conditioned room and increasing the level of indoor air quality, and also in decreasing the energy expended.