Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 10, Problem 10.4P
To determine
Overall heat transfer coefficient considering fouling factor.
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A Thomas meter is located in an air duct of 2 sq ft cross-sectional area. The air weighs 0.083 lb per cu ft, and its specific heat is 0.24. Assume a controlled temperature differential of 5° and heater potential of 110 volts. Plot the velocity as abscissa and amperage as ordinate for veloc- ity 0 to 300 ft per min. Assume constant amperage of 3, and plot tem- perature difference against velocity. Discuss the curves from the stand- point of accuracy of the system.
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II Review
Part A
A flow-through electric water heater has a 22 kW
electric heater inside an insulated 2.0-cm-diameter
pipe so that water flowing through the pipe will have
good thermal contact with the heater. Assume that
all the heat energy is transferred to the water.
Suppose the inlet water temperature is 12°C and
the flow rate is 8.0 L/min (about that of a
standard shower head).
What is the outlet temperature?
Express your answer in degrees Celsius.
?
Tout =
°C
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1. The log mean area for a l-inch schedule 40 steel pipe that is 0.50-m in length.
a. 0.08990 m?
b. 0.09391 m?
c. 3.698×10-3 m2
d. 3.539×10-3 m?
2. What is the heat loss per m² of a surface area of an insulating wall composed of 50.0 mm thick brick (k = 0.69 W/mK) where the
inside temperature is 352.7 K and the outside temperature is 297.1 K.
a. 7.6728 W/m?
b. 76.728 W/m?
c. 767.28 W/m?
d. 7672.8 W/m?
3. The maximum net transfer unit and Crin/Coa, of a particular parallel-flow heat exchanger is 4.00 and 1.00 respectively. Approximate
the effectiveness of this heat exchanger.
a. 80%
b. 70%
c. 60%
d. 50%
%3!
Chapter 10 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Ch. 10 -
10.1 In a heat exchanger, as shown in the...Ch. 10 - Prob. 10.2PCh. 10 -
10.3 A light oil flows through a copper tube of...Ch. 10 - Prob. 10.4PCh. 10 - Water flowing in a long, aluminum lube is to be...Ch. 10 - Mot water is used to heat air in a double-pipe...Ch. 10 - Prob. 10.7PCh. 10 -
10.8 The heat transfer coefficient of a copper...
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Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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