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Improvement of ventilation and smoke control system design for traditional underground garage

1.車庫送風系統兼做排煙時的補風

1. garage air supply system is also used as air supplement during smoke exhaust

2.排煙系統只與排風系統共用主機及主管段，然后個分支路，在排煙支路上設排煙防火閥（280°C，常閉），在排風支路上設防煙防火調節閥（70°C，常開）火災時消防控制中只對這兩個閥門進行啟閉就可以實現排風系統向排煙系統的轉換。從而減少了電動控制閥門的數量，降低了工程造價，提高了系統的穩定性，與傳統的系統比較，就是排煙與排風各設支管。由于排煙口距遠排煙點不超過30m即可滿足要求，所以排煙支管不會過長，而且排煙時可以采用較高的流速，排煙管道的斷面尺寸可以做得較小。

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.

地下車庫設的注意事項 Considerations in the design of underground garage

由于地下車庫自身對噪聲的要求不是很高，所以盡可能減小風道尺寸，以降低造價，節約空間。

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.

總結：由于排放有害物的汽車屬于運動中的物體，而且包含大部分有害物的尾氣又是高溫射流，有害氣體不可能穩定的停留在車庫下部，因此，車庫的日常排風全部由上方排出，并將所有風口置于車庫上部是可行的。同時，在支管上裝設溫度超過280℃時能自行關閉的排煙防火閥，則火災排煙風管系統與日常排風風管系統即可完全合一。

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.

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