Air passes along an insulated horizontal pipe of 0.05 m2 cross sectional area. In the pipe it passes over a heating element. It enters at 20 degrees C, 1.013 bar and 3O m/s. Rair = 287 J/kg.K and C,=1005 J/kg.K (a) Determine the mass flow rate of the air. [ Select ] O kg/s

Air passes along an insulated horizontal pipe of 0.05 m2 cross sectional area. In the pipe it passes over a heating element. It enters at 20 degrees C, 1.013 bar and 3O m/s. Rair = 287 J/kg.K and C,=1005 J/kg.K (a) Determine the mass flow rate of the air. [ Select ] O kg/s

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter7: Forced Convection Inside Tubes And Ducts

Section: Chapter Questions

Problem 7.33P

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Question

Air passes along an insulated horizontal pipe of
0.05 m2 cross sectional area. In the pipe it
passes over a heating element. It enters at 20
degrees C, 1.013 bar and 30 m/s.
Rair = 287 J/kg.K and Cp=1005 J/kg.K
(a) Determine the mass flow rate of the air.
[ Select ]
O kg/s
(b) Determine the temperature of the air at the
exit if the pressure is 1.5 bar (you may assume
velocity change is negligible)
[ Select ]
(c) Determine the rate of heat input
[ Select ]
O kW

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