MIL-HDBK-1011/2

APPENDIX C (continued)

Pick predominant wind direction associated with the 82deg.F to 86deg.F band

for the

month. (This range roughly corresponds to conditions when ventilation is

effective.

(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 windspeed corresponding

to direction chosen in Step 5 for the month.

a = ))))) deg = ))))) deg

(7)

Incidence angle on windward face,

alpha, from site plan and prevailing

wind direction, (see Figure C-2).

(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

(10)

For the surrounding

PCCF = )))) = )))))

neighborhood and the proposed

building type, determine from

Table C-3 the pressure coefficient

correction factor, PCCF.

PD = )))) = )))))

(11)

Calculate the revised pressure

coefficient differential, PD.

PD = PCD x PCCF

TCF = )))) = )))))

(12)

Obtain terrain correction

factor, TCF, from Table C-4.

W = )))) fpm = )))) fpm

(13)

Compute revised meteorological wind

speed in feet per minute, W.

W = WS x TCF x 101.2

A = ))))) ft.2-= )))) ft.2-

(14)

Calculate required open effective

window area, A.

A = (1.56 CFM) / [W x (PD)1/2]

Select an open inlet area, A+i, > A. A+i,= ))))) ft.2-= )))) ft.2-

(15)

Note: if equal inlet and outlet

area are desired, A+i, =1.41A.

106

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