Introduction to Heat Transfer
6th Edition
ISBN: 9780470501962
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Chapter 3, Problem 3.56P
(a)
To determine
heat is extracted from the air per unit tube length.
(b)
To determine
evaluate the effect of frost formation on the cooling capacity of a tube for frost layer thicknesses.
(c)
To determine
how long will it take for the frost to melt.
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2. For a saturated dry steam at 1,500 KPa that passes through a 100 mm (OD) steel
pipe with a thickness of 5 mm and a length of 100 meters. The steam line is
insulated with a 50 mm thickness and a thermal conductivity of 0.25 W/m.C. For a
mass flow rate of 600 kg of steam per hour. The surface film conductance of steam
is h = 5,500 W/m?.C, surface film conductance of air is h = 12 W/m?.C , thermal
conductivity of pipe material is k = 153 W/m.C and the ambient air temperature is
-10°C . Determine the following:
a) The quality of steam after passing through the pipe
b) Explain the concepts/principles that were considered and the factors that
affected the condition of the above mentioned items (a & b)
@ 1,500 KPa (tsat = 198.32°C)
kJ
2,792.20-
kg
k]
844.89
kg
kJ
1,947.30-
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1
hg
2
hf
hfg
An electric heater heats the inner tube walls of a concentric tube annulus at a rate of 2000 W/m. The inner and outer tube diameters are 25 and 50 mm respectively. Water enters the annular region at 25 ⁰C and leaves at 85 ⁰C. The flow rate of water is 0.04 kg/s and the outer tube wall is insulated. Assuming that fully developed conditions exist at the outlet, the inner tube surface temperature at the outlet will be ?
A 10-mm-inner-diameter pipe made of commercial steel is used to heat a liquid in an industrial process. The liquid enters the pipe with Ti=25°C, V=0.8 m/s. A uniform heat flux is maintained by an electric resistance heater wrapped arounf the outer surface of the pipe, so that the fluid exits at 75°C. Assuming fully developed flow and taking the average fluid properties to be ρ=1000 kg/m3, cp=4000 J/kg·K, µ=2x10-3 kg/m·s, k=0.48 W/m·K, and Pr=10, determine:
The required surface heat flux , produced by the heater
The surface temperature at the exit, Ts
The pressure loss through the piper and the minimum power required to overcome the resistance to flow.
Chapter 3 Solutions
Introduction to Heat Transfer
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