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ANALYSIS & DESIGN OF STAIR CASE
Part-1 of BS 5395Full description
stair case
ECG Engineering Consultants Group
PROJECT NAME: Nozha City Center PROJECT NO.: 1127
DATE: MAY-2007 COMPUTED BY: A. Salah
STAIR CASE PRESSURIZATION DESIGN CALCULATION SHEET
Input Data: No. of levels levels (including ground ground floor) floor) Average level height
: :
3 6
Floor Area
:
8500 m
Exterior building wall area per floor Wall Tightness
: :
700 2
m
Stairwell wall area per floor Wall Tightness
: :
16 2
m
Elevator shaft walls Wall Tightness
: :
14 2
m
The area ga gap ar around each sta stairwell do door Outside design temperature Stairwell temperature
: : :
Stairwell door width Stairwell door height Force to overcome door closer Distance from door knob to edge of knob side of door
: : :
1 2.1 53
m m N
:
75
mm
Assumptions: The pressure difference between stairwell and building at stairwell bottom
:
20
Pa
Critical Velocity
:
m 2 2
(1=Tight, 2=Average, 3=Loose, 4=Very Loose) 2
(1=Tight, 2=Average, 3=Loose) 2
(1=Tight, 2=Average, 3=Loose) 2
0.024 m 40.5 deg C 35 deg C
1.524 m/s
Height Limit Check:
Maximum allowable pressure difference between between the stairwell stairwell and the building building
=
70.476 Pa
=
303.2
Height limit below which satisfactory pressurization pressurization is possible possible
m
Calculations: 2
Abo Flow area between the building and outside per floor
=
0.147 m
Asb Flow area between stairwell and the building per floor
=
0.026 m
B Pressure difference per height due to stack effect Psb Pressure difference between stairwell top and the building
= =
0.197 Pa/m 23.44 Pa
=
0.302 m /s
2
Simple stairwell pressurization: Q
Flow rate of the pressurization air
Stair Case Pressurization Design Calculation Sheet
3
(= 639.737452 cfm)
1 of 2
Canadian stairwell pressurization press urization:: In this system, an exterior stairwell door opens automatically upon system activation. In addition, the lower two floors will be considered opened, while the others doors will be considered closed
I. Opened doors section: Pressur ssuree diff ifference at the the botto ttom of the the sec sectio tion Pres Pressu sure re diff differ eren ence ce at the the top top of the the sect sectio ion n Flow factor
= = =
20 Pa 22.2 22.295 95 Pa 3.8555 m/s
Open stairwell flow area
=
0.8528 m
Effective flow area
=
0.1449 m
Flow rate from this section
=
1.117 m /s
Pres Pressur suree diffe differe renc ncee at the botto bottom m of the sect sectio ion n Pres Pressu sure re diff differ eren ence ce at the the top top of the the sect sectio ion n Flow factor
= = =
22.979 22.979 Pa 24.1 24.162 62 Pa 4.0708 m/s
Effective flow area
=
0.026 m
Flow rate from this section
=
0.1049 m /s
Pressure difference at the exterior door (~ at 1.5m height)
=
20.91 Pa
Open exterior stairwell door effective flow area
=
0.8528 m
Flow rate from this section
=
3.2724 m /s
2 2 3
(= 2366.86097 cfm)
II. Closed doors section:
2 3
(= 222.191571 cfm)
III. Exterior stairwell door:
2 3
(= 6933.78697 cfm)
The total flow needed to pressurize the stairwell at the above conditions is the sum of these three separate flows
= =
1.117
+
0.105
+
3.27238304
3
4.4943 m /s
(= 9523 cfm) PROVIDE STAIRCASE PRESSURIZATION FAN ( 9500 CFM) FOR EACH STAIR
Stair Case Pressurization Design Calculation Sheet
