The Figure below (Figure 3) shows a horizontal rectangular air duct of width B = 1 m and height H = 0.3 m which carries air at a flow rate of Q = 2.5 m³/s. The duct is made of commercial steel. The horizontal duct system has no change in elevation between cross-sections (1) and (2). Hint: In non-circular conduits, the diameter D of circular pipes, is replaced by the hydraulic diameter DH = 4 x RH in all relevant equations.

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QUESTION 3:
The Figure below (Figure 3) shows a horizontal rectangular air duct of width B = 1 m and height
H = 0.3 m which carries air at a flow rate of Q = 2.5 m³/s. The duct is made of commercial
steel. The horizontal duct system has no change in elevation between cross-sections (1) and
(2).
Hint: In non-circular conduits, the diameter D of circular pipes, is replaced by the hydraulic
diameter DH = 4 x RH in all relevant equations.
(2)
(1)
Air flow: Q = 2.5 m³/s
Figure 3. Horizontal duct system
B = 1 m
L = 100 m
H = 0.3 m
Complete the following:
a) Calculate the head loss along the 100 m long duct system between cross-sections (1)
and (2).
b) Sketch the duct system together with the hydraulic grade line (HGL) and total head
line (THL) between cross-sections (1) and (2)
Transcribed Image Text:QUESTION 3: The Figure below (Figure 3) shows a horizontal rectangular air duct of width B = 1 m and height H = 0.3 m which carries air at a flow rate of Q = 2.5 m³/s. The duct is made of commercial steel. The horizontal duct system has no change in elevation between cross-sections (1) and (2). Hint: In non-circular conduits, the diameter D of circular pipes, is replaced by the hydraulic diameter DH = 4 x RH in all relevant equations. (2) (1) Air flow: Q = 2.5 m³/s Figure 3. Horizontal duct system B = 1 m L = 100 m H = 0.3 m Complete the following: a) Calculate the head loss along the 100 m long duct system between cross-sections (1) and (2). b) Sketch the duct system together with the hydraulic grade line (HGL) and total head line (THL) between cross-sections (1) and (2)
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