Foundations of Materials Science and Engineering
6th Edition
ISBN: 9781259696558
Author: SMITH
Publisher: MCG
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Chapter 16.13, Problem 48KCP
To determine
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Air at 25°C (cp=1006 J/kg.K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg.K) in a cross-flow heat exchanger
with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750
W/K and the mass flow rate of air is twice that of oil.
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Air
Oil
80°C
Determine the effectiveness of the heat exchanger.
In an industrial facility, a counter-flow double-pipe heat exchanger uses superheated steam at a temperature of 155°C to
heat feed water at 30°C. The superheated steam experiences a temperature drop of 70°C as it exits the heat exchanger.
The water to be heated flows through the heat exchanger tube of negligible thickness at a constant rate of 3.47 kg/s. The
convective heat transfer coefficient on the superheated steam and water side is 850 W/m²K and 1250 W/m²K,
respectively. To account for the fouling due to chemical impurities that might be present in the feed water, assume
a fouling factor of 0.00015 m²-K/W for the water side.
The specific heat of water is determined at an average temperature of (30 +70)°C/2 = 50°C and is taken to be
J/kg.K.
Cp=
4181
Water
Steam
What would be the required heat exchanger area in case of parallel-flow arrangement?
The required heat exchanger area in case of parallel-flow arrangement is
1m².
A single-pass crossflow heat exchanger is used to cool jacket water (cp = 1.0 Btu/lbm.°F) of a diesel engine from 190°F to 140°F, using
air (Cp = 0.245 Btu/lbm.°F) at inlet temperature of 90°F. Both air flow and water flow are unmixed. If the water and air mass flow rates
are 85500 lbm/h and 400,000 lbm/h, respectively, determine the log mean temperature difference for this heat exchanger. Assume
the correction factor F to be 0.92.
Air flow
(unmixed)
Water flow
(unmixed)
The log mean temperature difference of the heat exchanger is
°F.
Chapter 16 Solutions
Foundations of Materials Science and Engineering
Ch. 16.13 - Prob. 1KCPCh. 16.13 - Prob. 2KCPCh. 16.13 - Prob. 3KCPCh. 16.13 - Prob. 4KCPCh. 16.13 - What is the relationship between B and H?Ch. 16.13 - Prob. 6KCPCh. 16.13 - Prob. 7KCPCh. 16.13 - Prob. 8KCPCh. 16.13 - Prob. 9KCPCh. 16.13 - Prob. 10KCP
Ch. 16.13 - Prob. 11KCPCh. 16.13 - Prob. 12KCPCh. 16.13 - Prob. 13KCPCh. 16.13 - Prob. 14KCPCh. 16.13 - Prob. 15KCPCh. 16.13 - Prob. 16KCPCh. 16.13 - Prob. 17KCPCh. 16.13 - Prob. 18KCPCh. 16.13 - Prob. 19KCPCh. 16.13 - Prob. 20KCPCh. 16.13 - Prob. 21KCPCh. 16.13 - Prob. 22KCPCh. 16.13 - Prob. 23KCPCh. 16.13 - Prob. 24KCPCh. 16.13 - Prob. 25KCPCh. 16.13 - Prob. 26KCPCh. 16.13 - Prob. 27KCPCh. 16.13 - Prob. 28KCPCh. 16.13 - Prob. 29KCPCh. 16.13 - Prob. 30KCPCh. 16.13 - Prob. 31KCPCh. 16.13 - Prob. 32KCPCh. 16.13 - Prob. 33KCPCh. 16.13 - Prob. 34KCPCh. 16.13 - Prob. 35KCPCh. 16.13 - What are eddy currents? How are they created in a...Ch. 16.13 - Prob. 37KCPCh. 16.13 - Prob. 38KCPCh. 16.13 - Prob. 39KCPCh. 16.13 - Prob. 40KCPCh. 16.13 - What compositions of NiFe alloys are especially...Ch. 16.13 - Prob. 42KCPCh. 16.13 - Prob. 43KCPCh. 16.13 - Prob. 44KCPCh. 16.13 - Prob. 45KCPCh. 16.13 - Prob. 46KCPCh. 16.13 - Prob. 47KCPCh. 16.13 - Prob. 48KCPCh. 16.13 - Prob. 49KCPCh. 16.13 - Prob. 50KCPCh. 16.13 - Prob. 51KCPCh. 16.13 - Prob. 52KCPCh. 16.13 - Prob. 53KCPCh. 16.13 - Prob. 54KCPCh. 16.13 - Prob. 55KCPCh. 16.13 - Prob. 56KCPCh. 16.13 - Prob. 57KCPCh. 16.13 - Prob. 58KCPCh. 16.13 - Prob. 59KCPCh. 16.13 - Prob. 60KCPCh. 16.13 - Prob. 61KCPCh. 16.13 - Prob. 62AAPCh. 16.13 - Prob. 63AAPCh. 16.13 - Prob. 64AAPCh. 16.13 - Prob. 65AAPCh. 16.13 - Prob. 66AAPCh. 16.13 - Gadolinium at very low temperatures has an average...Ch. 16.13 - Prob. 68AAPCh. 16.13 - Prob. 69AAPCh. 16.13 - Prob. 70AAPCh. 16.13 - Prob. 71AAPCh. 16.13 - Prob. 72AAPCh. 16.13 - Prob. 73AAPCh. 16.13 - Prob. 74AAPCh. 16.13 - Prob. 75AAPCh. 16.13 - Draw a hysteresis B-H loop for a ferromagnetic...Ch. 16.13 - Describe what happens to the magnetic induction...Ch. 16.13 - What happens to the magnetic domains of a...Ch. 16.13 - What are desirable magnetic properties for a soft...Ch. 16.13 - What are hysteresis energy losses? What factors...Ch. 16.13 - How does the AC frequency affect the hysteresis...Ch. 16.13 - How can eddy currents be reduced in metallic...Ch. 16.13 - Why does the addition of 3% to 4% silicon to iron...Ch. 16.13 - What disadvantages are there to the addition of...Ch. 16.13 - Why does a laminated structure increase the...Ch. 16.13 - Prob. 86AAPCh. 16.13 - Prob. 87AAPCh. 16.13 - Prob. 88AAPCh. 16.13 - Prob. 89AAPCh. 16.13 - Prob. 90AAPCh. 16.13 - Prob. 91AAPCh. 16.13 - Prob. 92AAPCh. 16.13 - Prob. 93AAPCh. 16.13 - Prob. 94AAPCh. 16.13 - Prob. 95AAPCh. 16.13 - Prob. 96AAPCh. 16.13 - Prob. 97AAPCh. 16.13 - Prob. 98AAPCh. 16.13 - Prob. 99AAPCh. 16.13 - Prob. 100AAPCh. 16.13 - Prob. 101AAPCh. 16.13 - Prob. 102AAPCh. 16.13 - Prob. 103SEPCh. 16.13 - Prob. 104SEPCh. 16.13 - Prob. 105SEPCh. 16.13 - Prob. 106SEP
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