Air that is fully-developed flows in a rectangular duct of inside dimensions 0.610 m x 0.305 m. The inlet air temperature is 21.1°C, and at outlet the air temperature is 26.7°C. If the mass flow of air is 2.72 kg/h and the duct length is 2.44 m, calculate (a) the required beat in the

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Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.22P
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Air that is fully-developed flows in a
rectangular duct of inside
dimensions 0.610 m x 0.305 m. The
inlet air temperature is 21.1°C, and
at outlet the air temperature is
26.7°C. If the mass flow of air is 2.72
kg/h and the duct length is 2.44 m,
calculate (a) the required heat in the
form of a constant wall flux (in
W/m?) to heat the air and (b) the
pressure drop (in Pa) due to friction.
Also, solve for (c) h (in W/m¯-K) and
(d) Ts,i (in °C).
Answers:
Analysis:
convection
°C
Туре of flow:
v at constant
LH
Nu =
h =
W/m -K
%3D
Q.dot =
W
9s.dot =
W/m?
-5
ΔΡ -
x 10 (in
scientific notation, 4 decimal places)
Ts,i =
°C
II
>
II
Transcribed Image Text:Air that is fully-developed flows in a rectangular duct of inside dimensions 0.610 m x 0.305 m. The inlet air temperature is 21.1°C, and at outlet the air temperature is 26.7°C. If the mass flow of air is 2.72 kg/h and the duct length is 2.44 m, calculate (a) the required heat in the form of a constant wall flux (in W/m?) to heat the air and (b) the pressure drop (in Pa) due to friction. Also, solve for (c) h (in W/m¯-K) and (d) Ts,i (in °C). Answers: Analysis: convection °C Туре of flow: v at constant LH Nu = h = W/m -K %3D Q.dot = W 9s.dot = W/m? -5 ΔΡ - x 10 (in scientific notation, 4 decimal places) Ts,i = °C II > II
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