Engineering Your Future
9th Edition
ISBN: 9780190279264
Author: William C. Oakes, Les L. Leone
Publisher: Oxford University Press, USA
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Chapter 17, Problem 17.8EAA
To determine
Determine what the three non-parallel forces must be if they hold a rigid body in equilibrium.
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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 17 Solutions
Engineering Your Future
Ch. 17 - Prob. 17.1EAACh. 17 - Prob. 17.2EAACh. 17 - Prob. 17.3EAACh. 17 - Prob. 17.4EAACh. 17 - Prob. 17.5EAACh. 17 - Prob. 17.6EAACh. 17 - Prob. 17.7EAACh. 17 - Prob. 17.8EAACh. 17 - Prob. 17.9EAACh. 17 - Prob. 17.10EAA
Ch. 17 - Prob. 17.11EAACh. 17 - Prob. 17.12EAACh. 17 - Prob. 17.13EAACh. 17 - Prob. 17.14EAACh. 17 - Prob. 17.15EAACh. 17 - Prob. 17.16EAACh. 17 - Prob. 17.17EAACh. 17 - Prob. 17.18EAACh. 17 - Prob. 17.19EAACh. 17 - Prob. 17.20EAACh. 17 - Prob. 17.21EAACh. 17 - Prob. 17.22EAACh. 17 - Prob. 17.23EAACh. 17 - Prob. 17.24EAACh. 17 - Prob. 17.25EAACh. 17 - Prob. 17.26EAACh. 17 - Prob. 17.27EAACh. 17 - Prob. 17.28EAACh. 17 - Prob. 17.29EAACh. 17 - Prob. 17.30EAACh. 17 - Prob. 17.31EAACh. 17 - Prob. 17.32EAACh. 17 - Prob. 17.33EAACh. 17 - Prob. 17.34EAACh. 17 - Prob. 17.35EAACh. 17 - Prob. 17.36EAACh. 17 - Prob. 17.37EAACh. 17 - Prob. 17.38EAACh. 17 - Prob. 17.39EAACh. 17 - Prob. 17.40EAACh. 17 - Prob. 17.41EAACh. 17 - Prob. 17.42EAACh. 17 - Prob. 17.43EAACh. 17 - Prob. 17.44EAACh. 17 - Prob. 17.45EAACh. 17 - Prob. 17.46EAACh. 17 - Prob. 17.47EAACh. 17 - Prob. 17.48EAACh. 17 - Prob. 17.49EAACh. 17 - Prob. 17.50EAACh. 17 - Prob. 17.51EAACh. 17 - Prob. 17.52EAACh. 17 - Prob. 17.53EAACh. 17 - Prob. 17.54EAACh. 17 - Prob. 17.55EAACh. 17 - Prob. 17.56EAACh. 17 - Prob. 17.57EAACh. 17 - Prob. 17.58EAACh. 17 - Prob. 17.59EAACh. 17 - Prob. 17.60EAACh. 17 - Prob. 17.61EAACh. 17 - Prob. 17.62EAACh. 17 - Prob. 17.63EAACh. 17 - Prob. 17.64EAACh. 17 - Prob. 17.65EAACh. 17 - Prob. 17.66EAACh. 17 - Prob. 17.67EAACh. 17 - Prob. 17.68EAACh. 17 - Prob. 17.69EAACh. 17 - Prob. 17.70EAACh. 17 - Prob. 17.71EAACh. 17 - Prob. 17.72EAACh. 17 - Prob. 17.73EAACh. 17 - Prob. 17.74EAACh. 17 - Prob. 17.75EAACh. 17 - Prob. 17.76EAACh. 17 - Prob. 17.77EAACh. 17 - Prob. 17.78EAACh. 17 - Prob. 17.79EAACh. 17 - Prob. 17.80EAACh. 17 - Prob. 17.81EAACh. 17 - Prob. 17.82EAACh. 17 - Prob. 17.83EAACh. 17 - Prob. 17.84EAACh. 17 - Prob. 17.85EAACh. 17 - Prob. 17.86EAA
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