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SMOKE MANAGEMENT DESIGN CALCULATION SHEET 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)
=
x
3.60
Fire Area
=
4
14.39
m2
Heat Rate ( Qr)
=
Heat Production (Q)
=
278.00 kw/m2 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)
Temperature Rise (Tr)
=
1.5
=
0.188 x P x Y 11.2912 kg/s
=
Q / (Mf x Cp)
= = Max. Smoke Temp. (Tc)
Air Volume Flow rate (Ma)
350.739 Deg.c
= To + Tr 0 = = 390.739 Deg. c =
664 K
Mf x Tc / (1.2 x To) 3
=
19.9532 m /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 Shall be divided into 4 exhaust fans two speed fire protected each one is 38 000 cfm for ventilation. Direct drive two speed smoke exhaust fans of 14.1 m 3/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.
