MIL-HDBK-1011/2
APPENDIX C (continued)
Month: ))))))))))))))))
From Climate Analysis, examine
Month: ))))))))))))))))
worst two naturally ventilated
months separately.
WD= )))))))) = )))))
(5)
Prevailing wind direction for month, WD.
(a)
OPTION 1: SMOS Part E--"Temperature versus "Wind Direction".
Pick predominant wind direction associated with the 82 deg. to 86
deg. F band for the month.
(b)
OPTION 2: If no SMOS exists for the location, use RUSSWO Part
C--"Surface Winds." Pick predominant wind direction for month.
WS = )))) knts = )))) knts
(6)
Wind speed for month, WS.
From SMOS or RUSSWO Part C--"Surface Winds,"
pick mean wind speed corresponding to direction
chosen in Step 5 for the month.
alpha = )))) deg ))))))) deg
(7)
Incidence angle on windward face, alpha.
(See site plan and Figure C-2 or C-3).
(8)
From Table C-1 or C-2 determine:
WPC = )))))))) = )))))))))
(a)
Windward pressure coefficient, WPC
LPC = )))))))) = )))))))))
(b)
Leeward pressure coefficient, LPC
PCD = )))))))) = )))))))))
(9)
Pressure coefficient differential, PCD.
PCD = WPC - LPC
PCCF = )))))))) = )))))))))
(10)
For the surrounding neighborhood
and the proposed building type, determine
from Table C-3 the pressure coefficient
correction factor, PCCF for the appropriate
building type (Figure C-4).
Bldg. type no. )))) h = ))))) g = )))))
h/g = )))))
PD = )))))
= ))))))
(11)
Calculate the revised pressure
coefficient differential, PD.
PD = PCD * PCCF
TCF = )))))
= ))))))
(12)
Obtain terrain correction factor,
TCF, from Table C-4. Terrain type ))))))))))
W = ))))) fpm = )))))) fpm
(13)
Compute revised meteorological wind
speed in feet per minute, W.
W = WS * TCF * 101.2
A = ))))) ft2 = ))))))
(14)
Calculate required open effective
ft.2-
window area, A.
A = (1.56 * CFM) / [W * (PD)]
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