Staircase Pressurization Calculation.B+G+21.xlsx

	A	B	C	D	E	F	G	H	I
1	STAIRCASE PRESSURIZATION CALCULATION
2	PROJECT
3	Structural components	height ft	Length ft	width ft	Area	Average Leakage Ratio AL/A	Average Leakage Ratio AL/A	Total leakage Area ft^2
4	Wall	12	17.5	8.5	624	0.11x10^-3	0.00011	0.06864
5	Floor		17.5	8.5	297.5	0.52x10^-4	0.000052	0.01547
6	Ceiling		17.5	8.5	297.5	0.52x10^-4	0.000052	0.01547
7	Door Frame	7		3	20	Door crack	0.006	0.12
8	Total leakage Area /Floor							0.21958
9
10	∆P (inch w.g)	0.37
11
12	Air Flow through construction gap/cracks
13	Q1=	2610	x	0.100	Leakage Area ft^2)	0.6	∆P (inch w.g)	158	cfm
14
15	Air Flow through door gaps
16	Q2=	2610	x	0.12	Leakage Area ft^2)	0.2	∆P (inch w.g)	63	cfm
17
18	Total flow rate per floor
19	No of floor	25						221	cfm
20	Total flow for Staircase							5518	cfm
21
22		height ft	Length ft	width ft	Area	No of door open during evacuation
23	Open Area Across Door single Leaf	7		3	21	1
24	Open Area Across Door double Leaf	7		6	42	1
25	Q3=	Vmax	x	AE	Effective area Area ft^2)
26
27	Where, Vmax is the maximum air velocity considered through an open door and is 200 fpm (IBC 909. 7.2)
28
29	Q3=							12600	cfm
30
31	QT Total Air flow rate						=	18118	cfm
32	Factor of safety							10%
33	QT Total Air flow rate						=	19930	cfm
34
35	Relief Air requirements						=	14412	cfm
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