MIL-HDBK-1011/2
APPENDIX D (continued)
(7)
Incidence angle, alpha, on windward face, alpha = 47.5deg = 47.5deg
from site plan and prevailing
wind direction (see Figure C-2).
(8)
From Table C-1 or C-2 determine: (used 45deg.)
(a)
Windward pressure coefficient, WPC
WPC = +0.6
=
+0.6
(b)
Leeward pressure coefficient, LPC
LPC = -0.5
=
-0.5
(9)
Pressure coefficient differential, PCD.
PCD =
1.1
=
1.1
PCD = WPC - LPC
(10)
For the surrounding neighborhood and the
PCCF =
0.61 =
0.61
proposed building type, determine from
Table C-3 the pressure coefficient
correction factor, PCCF.
Bldg type No. 5
h = 23 ft g = 65 ft
h/g = 2.8
(11)
Calculate the revised pressure
PD = 0.67
=
0.67
coefficient differential, PD
PD = PCD * PCCF
(12)
Obtain terrain correction factor, TCF,
TCF =
0.85
=
0.85
from Table C-4.
Terrain type suburban
(13)
Compute revised meteorological wind speed
W=
817 fpm =
886fpm
fpm in feet per minute, W.
W = WS * TCF * 101.2
A = 18.5ft2 = 17.0 ft2
(14)
Calculate required open effective
window area, A.
A = (1.56 * CFM) / [W * (PD)1/2]
72 ft2 =
72ft2
(15)
Calculate the inlet window area for the
Wi =
proposed design, Wi .
0.56 =
0.56
(16)
RFi =
type, screens, etc., from Table C-5.
40 ft2 =
40ft2
(17)
Calculate the effective open inlet
Ai =
area, Ai .
Ai = Wi * RFi
21 ft2 =
19ft2
(18)
Calculate required open outlet area, Ao.
Ao =
Ao = A x Ai / [(Ai2 - A2)1/2]
40 ft2 = 40 ft2
(19)
Calculate the outlet window area for the
Wo =
proposed design, Wo.
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