7/27/2019 Car Park Calc.

http://slidepdf.com/reader/full/car-park-calc 1/1

 Area Served: Car Park

Ventilation Type: Mechanical Ventilation Fans

Brief description: Exhaust through high temperature rated fans.

Fresh Air make-up through Supply Fans.

Design Parameters:

Fire Size (A) = 4 x 3.60

Fire Area = 14.39 m2

Heat Rate ( Qr) = 278.00 kw/m2

Heat Production (Q) = 3999.86 kw

Perimeter ( P ) = 15.19 m

Smoke Layer Height (Y) = 2.50 m

Smoke Layer Depth (Db) = 1.50 m

 Air Specific Heat ( Cp) = 1.01 kj/kg.k

Outside Air Temp. (To) = 40 Deg.c 313 k

Calculations

Min. Smoke Flow Rate (Mf) = 0.188 x P x Y1.5

= 11.2912 kg/s

Temperature Rise (Tr) = Q / (Mf x Cp)

= 350.739 Deg.c

Max. Smoke Temp. (Tc) = To + Tr  

= 390.739 Deg.0c 664 K

 Air Volume Flow rate (Ma) = Mf x Tc / (1.2 x To)

= 19.9532 m3/s

= 42300 cfm

Note:

 As per ANSI/ASHRAE standards 62.1.2004

Recommendation provide 3.7 lit/sec/m2

Parking Area= 18000 m2

139900 cfm

Direct drive two speed smoke exhaust fans of 14.1 m3/s (64,000 cfm) rating shall be provided in each parking

zone , Fire rated for 300oC for 1 HR. Motor and Bearing shall be out of air stream.

SMOKE MANAGEMENT DESIGN CALCULATION SHEET

Shall be divided into 4 exhaust fans two speed fire protected each one is 38 000 cfm for ventilation.