7/30/2019 Staircase Pressurisation Calculation

1/1

DESCRIPTION

No of Floors 48 Nos

Assuming Gap Between Door and Floor 6 mm

Height of the Door 2500 mm

Length of the Door 1250 mmNo of Doors per Floor 1 Nos

AREA OF LEAKAGE

Area of Leakage (Sq.Mt)= Door Perimeter (mm) x Gap (mm)x 10^-6

Door Perimeter = 7500 mm

Area of leakage 0.045 Sq.Mt

Case -1

When doors Closed

Q = Leakage Air (m3/sec) = 0.839 *Area of Leakage * Sq.root of Pressure Diff

Pressure Difference (Pa) = 50 (Bldg Ht is more than 100 Mt)

Leakage Air (Q) m3/sec = 0.266968165

Leakage Air (Q) CFM / Floor 565.3443499 CFM

Case -2

When Fire Floor Door open

Area of the Door 3.125 Sq.Mt

Area of leakge through Door 33.625 Sq.ft

Air Velocity 100 FPM

Q =Leakage Air Per Floor 3362.5 CFM

No of Doors open at the time of Fire 1 Nos

(Only Fire Floor Door)

Req Air for pressurisation when door open 3362.5 CFM

in Fire Floor

No of Doors closed at the time of Fire 47

Req Air for pressurisation when door closed 26571.184 CFM

Floors

Total Fan capacity Required for Pressurising 29933.684 CFM

the whole staircase

STAIRCASE PRESSURISATION FOR ENNOVA PROJECT