The gymnasium building is a large space building with large volume, large heat transfer of enclosure structure, dense personnel lighting and large air conditioning load. Therefore, it is of great significance to design a reasonable air distribution to make the air distribution in the gymnasium meet the requirements of the competition and the audience, and ensure the energy saving of the air conditioning system.
Side delivery is the most widely used method in the competition hall of the gymnasium, and the nozzle side delivery is the most common. Regardless of the scale, the competition hall of the gymnasium usually has the characteristics of "bowl shape" with large space, low location of the competition venue and gradually rising auditorium, and the air outlet is far from the air-conditioning area (especially the competition area); The air supply jet at the nozzle side is long and the flow is large, which can adapt to the above conditions, so it is most used in large gymnasiums. The nozzle is arranged on the side wall around the hall or the surrounding beam of the structural grid, and the return air outlet is arranged on the side of the rear auditorium and the edge of the competition field. The temperature of the air conditioning area is uniform, and the rear audience close to the nozzle is basically in the return area, avoiding the "back wind"; In addition, nozzle air supply can save pipeline and reduce cost. But it also has some shortcomings: the wind speed in the competition field is difficult to control, and the wind speed sometimes exceeds 0.2m/s, which has an impact on the table tennis and badminton competitions; In addition, due to the large temperature difference of air supply and long jet, the cold air decreases and the hot air increases
The elephant is very obvious. In order to avoid this situation, many gymnasiums design the nozzle to be rotatable for adjustment. Such as Moscow Olympic Stadium, Tokyo daidaimu stadium, etc.
In addition to jet air supply, the side air supply mode also includes louver side air supply. However, due to noise and "back wind", louver side air supply is only used as auxiliary air supply.
In order to achieve the best air distribution effect and achieve the purpose of more economic and energy-saving operation, since the 1980s, engineering designers have rarely applied a single method to stadiums and gymnasiums, but combined a variety of air distribution forms. For example, the gymnasium of Beijing Olympic Sports Center adopts the form of upper air supply to supply air to the audience area, In the competition area, the alternative side air supply mode of nozzle and swirl tuyere is adopted.
