Ventilation Systems: Operation and Testing - GHDonline
Ventilation Systems: Operation and Testing - GHDonline
Ventilation Systems: Operation and Testing - GHDonline
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Q = V . A<br />
Conservation of Mass<br />
8 inch duct<br />
1<br />
12 inch duct<br />
3<br />
6 inch duct<br />
2<br />
Q 1 + Q 2 = Q 3<br />
V 1 A 1 + V 2 A 2 = V 3 A 3<br />
AIR FLOW<br />
• At st<strong>and</strong>ard temperature <strong>and</strong> pressure (STP):<br />
* 1 atmosphere & 70 o F *<br />
The density of air is 0.075 lb m /ft 3<br />
• Air will flow from a higher pressure region to a<br />
lower pressure region<br />
• Three Different Types of Pressure Measurements<br />
* Static * Velocity * Total *<br />
7
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