The thermal conductivity of aluminum is higher than that of concrete material (one of most popular building materials). Select one: O True O False An example of convective heat transfer is freezing of the ground during the winter. Select one: O True O False Fouling on heat exchanger tubes has no effect on heat exchanger's performances. Select one: O True O False

The thermal conductivity of aluminum is higher than that of concrete material (one of most popular building materials). Select one: O True O False An example of convective heat transfer is freezing of the ground during the winter. Select one: O True O False Fouling on heat exchanger tubes has no effect on heat exchanger's performances. Select one: O True O False

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

The thermal conductivity of aluminum is higher than
that of concrete material (one of most popular
building materials).
Select one:
O True
O False
An example of convective heat transfer is freezing of
the ground during the winter.
Select one:
O True
O False
Fouling on heat exchanger tubes has no effect on
heat exchanger's performances.
Select one:
O True
O False
For good winter jackets, they should be made of
light-weight materials, filled with air, that have very
low conductivity.
Select one:
O True
O False

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Please help. I am not sure how to approach this problem. This problem involves heat transfer and internal flow within a retangular channel. Thank you.
a. An air stream passing through a 2-inch (1/6 ft) diameter, thin-walled tube is to be heated by high- pressure steam condensing on the outer surface of the tube at 320 °F. The overall heat transfer coefficient, h between steam and air can be assumed to be 25 Btu/(ft2.hr °F) with the air entering at 100 ft/sec, 10 psia, 40 °F. The air is to be heated to 150 °F. Determine the tube length required. Assuming Rayleigh Line flow, calculate the static pressure change due to heat addition. Also, for the same inlet conditions, calculate the pressure drop due to friction, assuming Fanno flow in the duct with f = 0.018. b. c. d. To obtain an approximation to the overall pressure drop in this heat exchanger, add the two results. Discuss the accuracy of this calculation.
what id correct ans
1. A motor coil can be modeled as a hollow copper cylinder with an outer diameter of 0 50 mm, an inner diameter of 40 mm, and a length of 60 mm. The motor stalls at time t = 0 and, at this point, the copper experiences a step input in electrical heating of Po u(t), where Po is 350 W. Assume that there is little time for significant heat loss to the environment so that the copper cylinder can be considered to be insulated. If the initial temperature is 30 °C, find the temperature as a function of time, T(t), analytically using Laplace transforms. Calculate the time required to reach the breakdown temperature of the wire insulation, which is approximately 250 °C. Write a script file in MATLAB® to: (a) determine the time for the copper to reach 250 °C using the command find; and (b) plot T(t) over this time interval. Copper has a density of 8960 kg/m³ and a specific heat of 390 J/kg-°C. 25 mm 20 mm P(t) = Pou(t)