The wind pressure coefficient of the wind-capture device is defined as the ratio of the measured static pressure in the test section to the velocity pressure
of the outlet
The mean velocity pressure
acting on the external surfaces was evaluated using Eq.
exposure coefficient, kz: It varies with height and can be calculated by the following equation (ASCE 7-05, Eq.
In the limit as [Q.sub.b]/[Q.sub.c] [right arrow] 0, measured branch loss coefficient data became indeterminate, i.e., [C.sub.b] [right arrow] - [infinity], as a consequence of the velocity pressure
[p.sub.v9] approaching zero in that instance.
Figure 8 illustrates the measured total pressure loss for System Section #1A as a function of the velocity pressure
upstream of the test section (based on standard conditions of air density); the resulting system loss coefficient is C = 6.048.
The equation for determining air velocity from measured velocity pressure
The loss coefficient is defined as the ratio of the total pressure loss of a nonjunction fitting to that of velocity pressure
, and is given by
The fan velocity pressure
, [P.sub.vf], is the dynamic pressure based on the average velocity at the fan discharge.
The velocity pressure
switchover position of the machine was set at 5 mm for all process conditions.
* Velocity pressure
is the kinetic energy of the fluid flow.
Finally, velocity pressure
was measured in the discharge duct and primary air duct.
(a)The semi-implicit method for pressure-linked equations algorithm is used to solve the problem of velocity pressure