
545Passive Solar Heating, Cooling, and Daylighting
© 2008 Taylor & Francis Group, LLC
passing through the occupied space. Using the cross-sectional area, A
x
, of the space and
the room air velocity, V
a
, required, the ow is determined by
(9.13)
The proper placement of windows, “narrow” building shape, and open landscaping can
enhance natural wind ow to provide ventilation. The air ow rate through open win-
dows for wind-driven ventilation is given by [9]
vw w
(9.14)
where
Q is the air ow rate, m
3
/s
A
w
is the free area of inlet opening, m
2
V
w
is the wind velocity, m/s
C
v
is the effectiveness of opening = 0.5–0.6 for wind perpendicular ...