传统地下车库通风、防排烟系统设计的改进之处
Improvement of ventilation and smoke control system design for traditional underground garage
1.车库送风系统兼做排烟时的补风
1. garage air supply system is also used as air supplement during smoke exhaust
2.排烟系统只与排风系统共用主机及主管段，然后个分支路，在排烟支路上设排烟防火阀（280°C，常闭），在排风支路上设防烟防火调节阀（70°C，常开）火灾时消防控制中只对这两个阀门进行启闭就可以实现排风系统向排烟系统的转换。从而减少了电动控制阀门的数量，降低了工程造价，提高了系统的稳定性，与传统的系统比较，就是排烟与排风各设支管。由于排烟口距远排烟点不超过30m即可满足要求，所以排烟支管不会过长，而且排烟时可以采用较高的流速，排烟管道的断面尺寸可以做得较小。
2. the smoke exhaust system only shares the main engine and main pipe section with the exhaust system, and then has two branch roads. The smoke exhaust fire damper (280 ° C, normally closed) is set on the smoke exhaust branch road, and the smoke control fire damper (70 ° C, normally open) is set on the exhaust branch road. In case of fire, the conversion from the exhaust system to the smoke exhaust system can be realized only by opening and closing these two valves in the fire control. Thus, the number of electric control valves is reduced, the project cost is reduced, and the stability of the system is improved. Compared with the traditional system, smoke exhaust and air exhaust are provided with branch pipes respectively. Since the distance between the smoke exhaust outlet and the smoke exhaust point is no more than 30m, the smoke exhaust branch pipe will not be too long, and a higher flow rate can be used for smoke exhaust, and the section size of the smoke exhaust pipe can be made smaller.
地下车库设的注意事项 Considerations in the design of underground garage
由于地下车库自身对噪声的要求不是很高，所以尽可能减小风道尺寸，以降低造价，节约空间。
As the underground garage itself does not have high requirements for noise, the size of air duct shall be reduced as much as possible to reduce the cost and save space.
总结：由于排放有害物的汽车属于运动中的物体，而且包含大部分有害物的尾气又是高温射流，有害气体不可能稳定的停留在车库下部，因此，车库的日常排风全部由上方排出，并将所有风口置于车库上部是可行的。同时，在支管上装设温度超过280℃时能自行关闭的排烟防火阀，则火灾排烟风管系统与日常排风风管系统即可完全合一。
Summary: as the vehicle discharging hazardous substances is a moving object, and the tail gas containing most of the hazardous substances is a high-temperature jet, it is impossible for the hazardous gases to stay stably in the lower part of the garage. Therefore, the daily exhaust of the garage is discharged from the upper part, and it is feasible to place all air vents in the upper part of the garage. At the same time, the branch pipe is equipped with a smoke exhaust fire damper that can close automatically when the temperature exceeds 280 ℃, and the fire smoke exhaust air duct system can be fully integrated with the daily exhaust air duct system.
The above is a detailed introduction to the kitchen smoke hood of Jinan hotel. I hope it can help you If you have any questions, please contact us We will provide you with professional service http://www.jntfgd.com
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