Study of the temperature flow field change by air-conditioning system in a indoor circular stadium

The indoor environment is comfortable, the effects on human health, comfort and work efficiency is significant impact; Indoor Stadium is one great movement and respiration field space, to pursue a good air quality and moderate temperature changes, the athlete's health maintenance is the key factor can not be ignored. This study used CFD software to simulate the circular stadium indoor air-conditioning system, temperature changes in the dynamic case, air supply entrance(inlet) set to 4, exit (outlet) is also located 4; the wind speed is set to 2.0 and 3.0 m/s two categories, fixed wall temperature set to 30 °C; air conditioning temperature setting such as 18 to 25 °C eight temperature, the body the best standards of comfort, the temperature set to 28 °C (301K), take an observation point coordinate axes XYZ, coordinates (0, 0, 1.5), optimum temperature diffusion time of 900 seconds as a principle. The simulation results show that: (A) The closer from the supply outlet, the lower the temperature, air temperature from the inner edge of rim wall extends to form a low temperature around the center of concentric circles than the high temperature flow field. (B) It formed the largest wind speed in the delivery outlet, the farther away from the delivery outlet, the wind speed is smaller; air together a flow vortex, the center of the minimum wind speed to the center of the typhoon eye like a general, wind speed and very small state. (C) In the same wind speed, temperature setting, the lower, lower temperature and the temperature flow field area will be reduced, the temperature contours of flow field will be more intensive.