U p w a r d – A i r f l o w V e n t i l a t i o n S y s t e m
771
a) Model A1
b) Model C1
c) Model D1
Figure 14: Cp at outlet opening wall surface of Models A1, C1 and D1.
Table 4. Pressure coefficients comparison on the models
– leeward wall opening tapping points [0° and 1m/s case]
Model
Type
Pressure coefficient at leeward outlet
opening wall (vertical line)
∆Cp
Wind Velocity (m/s)
A1
-0.283 to -0.356
0.074
1
C1
-0.154 to -0.351
0.202
1
D1
-0.388 to -0.443
0.054
1
The velocity vectors and contour at 1m/s wind velocity for the three Models are shown in
figure 15.
The velocity vectors and pressure contour at 1m/s, 3m/s, 5m/s and 10m/s wind
velocities for Model A1 – Case B are shown in figure 16.
a) Model A1
b) Model 1
c) Model D1
Figure 15 a, b and c. Contour Level and Velocity
Vectors plotted in Models A1, B1 and D1 without
opening.
