DESIGN CALCULATIONS - Date: 2/27/2012 12:06

REFERENCE NOTESBS 7346 Part 4 : 2003.BS EN 12101-1/3: 2003BR 368 : 1999The above refenced third party documents have been used as design / guideline documents.

SMOKE VENTILATION SYSTEM

The above refenced third party documents have been used as design / guideline documents.

Design Objectives NoteLife Safety No User Input

Property Protection No ConstantAid to Fire Fighters Yes Results

Input Data Notes / ReferencesBuilding Height (Apex) Ha 15.50 mBuilding Height (Eaves / Haunch) 13.90Calculated Plan Area 21679 mCalculated Plan Area 21679 mNumber of Smoke Zones 11 BS 7347 P4 - 6.6.2.7, max 2000 / 2600m2Design Smoke depth dlv 11.50Sprinkler Operating Temperature SOT 79.00 CFixed dataAmbient temperature t 45 CAbsolute ambient temperature To 318 KAcceleration due to gravity g 9.81 kg.s-Density of ambient air 1.22 kg.m-Coefficient of Inlet Ci 0 6Coefficient of Inlet Ci 0.6Coefficient of ventilation Cv 0.67Specific heat capacity of air c 1.1 kJ.kg-.K-Selected Design Fire Size A BPerimeter of Fire P 12 12 m AssumedArea of Fire Af 9 9 m AssumedEntrainment Coefficient Ce 0.34 0.34 0.190 For large space rooms

0.337 For small space roomsVentilation area and inlet area ratio AvCv/AiCi 0.33 0.33 Range from 1, 0.5, 0.33, 0.25, 0.2, 0.15, 0.1Ventilation area and inlet area ratio AvCv/AiCi 0.33 0.33 Range from 1, 0.5, 0.33, 0.25, 0.2, 0.15, 0.1Narrowest width of smoke reservoir W 10 10 mDownstand factor 78 78 Downstand factor - 78 if none.Height to underside of smoke layer Y 4.00 4.00 mMass Flow of Smoke into layer Ml 32.35 32.35 kg/sec BS 7346 P4 - B.2,Heat release rate per sq metre of fire qf 500.00 500.00 kW BS 7346 P4 - Annex AConvective heat flux leaving flames Qf 4500.00 4500.00 kWHeat loss to structure 10.00 10.00 % Assessment range 5 - 20%Convective heat flux entering smoke layer Ql 4050.00 4050.00 kWC l l d f k l l 113 80 79 00 BS 7346 P4 E 2Calculated average temperature of smoke layer ql 113.80 79.00 C BS 7346 P4 - E.2Absolute average temp of smoke layer Tl 386.80 397.00 KAerodynamic Area of exhaust ventilation AvCv 3.40 4.22 m BS 7346 P4 - F.6Powered extract rate Vl 32.26 33.11 m.s- BS 7346 P4 - F.5Minimum Flowing layer depth dl 1.31 1.31 m BS 7346 P4 - F.2Critical exhaust rate Mcrit 720.54 720.54 kg.s- BS 7346 P4 - F.9Minimum No. of exhaust ventilators N 1 1 BS 7346 P4 - F.11Length of smoke ventilator Dv 2 2

il l iVentilator SelectionMin number of vents per zone N 1 1Coefficient of discharge for vent Cv 0.67 0.67Overall measured throat area of ventilation Av 5.07 6.30 mMeasured throat area of vent selected DSV1020 3.61 3.61 mQuantity of ventilators per smoke zone 2 2Overall Quantity of vents 22 22

C l A i h l i b d i kl i i i h h kColumn A is the solution based upon no sprinkler system interaction with the smoke.Column B is the solution based upon the average smoke layer temperature being reduced to at or below the sprinkler operating temperature

Formula Used

1. Mass flow of smoke into layer

MI C P (Y)1.5MI = Ce x P x (Y)1.5

where, Ce is entrainment coefficientP is perimeter of fireY Height to undesirable of smoke layer

2. Convecting Heat Flux leaving Flame

Qf = Af x qf

where, Af is Area of fireqf is heat release rate per sq metre of fire

3. Convecting Heat Flux Entering Smoke layer

QI = Qf x (1 (heat loss/100))QI = Qf x (1 - (heat loss/100))

4. Calculated average temperature of smoke layer

qI = QI / (c x MI)

where, c is specific heat of air

5. Absolute average temp of smoke layer

TI = qI +273

5. Poweer Extract Rate

VI = (MI x TI) / ( x To)where, isdensity of airTo is absolute temperature of air

6. Minimum Flowing layer depth

dI = ( (MI x TI) / (Y x (qI)0.5 x W) )0.666

where, W is Narrowest width of smoke reservoir

7. Critical exhaust rate

Mcric = [ 2.05 x x (g x To x qI)0.5 x dlv2 x Dv ] / TIwhere, dlv is design smoke depthDv is length of smoke ventilatorDv is length of smoke ventilator