Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 1, Problem 1.59P
Consider the wind turbine of Example 1.3. To reduce thenacelle temperature to
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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:
Air at atmospheric pressure enters a heating duct with dimensions of 3 x 6 in. The air enters the 16 ft long duct with a temperature of 32 F, and the duct surface is maintained at 150 F. If the air exit temperature is to be 68 F, what is the air flow, in lb/hr? (answer in whole number) For air, R = 53.342 ft-lbf/lbm-R, k = 0.173 Btu-in/ft2-hr-F, and cp = 0.24 Btu/lbm-
An ideal gas passes a diffuser. At the diffuser inlet, the temperature is T1 = 350.00 K, the pressure P1 = 100.00 kPa, the velocity V1 = 200.00 m/s, and the inlet area A1 = 0.30 m2. At the exit, the velocity is very small. The specific heat of the ideal gas at the constant pressure is cp = 1.0050 kJ/(kg·K). The gas constant is R = 0.2870 kPa·m3/(kg·K).
Determine the density at the inlet, ρ1 __________(kg/m3)
Chapter 1 Solutions
Fundamentals of Heat and Mass Transfer
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