Air enters a duct (100 cm *10̟cm*10 cm) at 32°C at a rate of 0.28m /min to cool 138 W electronic component placed on the duct . Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct. What is the exit temperature of air (°C)? C,= 1007 J/kg. C, v =1.654×10-5 m²/s, p 1.146 kg/m³ Pr = 0.7268, k = 0.02625 %3D %3D W/m. °C

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Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.7P
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Air enters a duct (100 cm *10̟cm*10
cm) at 32°C at a rate of 0.28m /min to
cool 138 W electronic component
placed on the duct. Assuming 85
percent of the heat generated inside is
transferred to air flowing through the
duct and the remaining 15 percent is
lost through the outer surfaces of the
duct. What is the exit temperature of
air (°C)?
C,= 1007 J/kg.°C, v =1.654×10-S m²/s, p
1.146 kg/m Pr = 0.7268, k = 0.02625
W/m.°C
Select one or more:
Transcribed Image Text:Air enters a duct (100 cm *10̟cm*10 cm) at 32°C at a rate of 0.28m /min to cool 138 W electronic component placed on the duct. Assuming 85 percent of the heat generated inside is transferred to air flowing through the duct and the remaining 15 percent is lost through the outer surfaces of the duct. What is the exit temperature of air (°C)? C,= 1007 J/kg.°C, v =1.654×10-S m²/s, p 1.146 kg/m Pr = 0.7268, k = 0.02625 W/m.°C Select one or more:
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