Car parking Ventilation (Part 02 - Ducted System Fan Capacity Calculation)

 Car Parking Smoke ventilation fan calculation:

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The following factors are required to calculate the capacity of the Exhaust & Fresh Air Fan

          1.Total Car parking Area
          2.Floor Height.
          3.Type of Ventilation system used (For more Detail)
    

   *Ducted Ventilation system
    *Impulsive Ventilation system
    *Induction ventilation system

 

Here I considered Ducted Ventilation System 

Total Car Parking Area - 675 m2

Floor Height - 4 m`

Volume of the building = Area * Height

                                       = 675*4

                                        = 2700 m3

                                                           

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Formula:

Air Changes Per Hour = (Volume /60 )*ACH

1. In Case of Normal Mode 

Exhaust fan  at Normal Mode shall operate @ 6 ACH  Exhaust   

           Space volume = 2700 m3

              For  1 ACH =(2700*1000/60x60)

                                  =750 L/s

                For 6 ACH =750*6

                                   =4500 L/s

So, Required Exhaust Fan Capacity @ normal mode = 4500 L/s

2. In Case of  Fire Mode 

Exhaust fan at Fire Mode shall operate @ 10 ACH  Exhaust

             Space volume = 2700 m3

              For  1 ACH = 750 m3

               For 10 ACH = 750*10

                                     = 7500 L/s

So, Required Exhaust Fan Capacity @ normal mode = 7500 L/s

Fresh Air fan Capacity is 85% of Exhaust Fan Capacity

Then, Required  Fresh Air Fan Capacity @ normal mode = 4500*85%

                                                                                            =3825 L/s.

                           Fresh Air Fan Capacity @ Fire mode = 7500*85%

                                                                                       = 6375 L/s

                                                        

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Calculation Summary:

Fresh Air Fan capacity @ Normal Mode = 3825 L/s

Fresh Air Fan capacity @ Fire Mode       = 6375 L/s

Exhaust Fan capacity @ Normal Mode = 4500 L/s

Exhaust Fan capacity @ Fire Mode       = 7500  L/s

Note : 

Air Change per hour @ normal mode & fire mode May differ based on their country standard norms 

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