Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
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Textbook Question
Chapter 13, Problem 13.40P
Consider the very long, inclined black surfaces
Determine the net radiation exchange between the surfaces per unit length of the surfaces. Consider the configuration when a black surface (A3), whose back side is insulated, is positioned along the dashed line shown. Calculate the net radiation transfer to surface A2per unit length of the surface and determine the temperature of the insulated surface A3.
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Students have asked these similar questions
3. Two parallel plates with a diameter of 60
cm, separated at a distance of 15 cm. The
temperature on the top surface is 4 oC and
the temperature on the bottom surface is
300 K. If all the surfaces are black, what is
the rate of heat transfer?
Question #9
A circular ceramic plate that can be modelled as a blackbody is being heated by an electrical
heater. The plate is 30cm in diameter and is situated in a surrounding ambient temperature
of 15°C where the natural convection heat transfer coefficient is 12W/m² K. The efficiency
of the electrical heater to transfer heat to the plate is 80%, the electric power is required
such that the heater needs to keep the surface temperature of the plate at 200°C.
Ambient 15°C Tsurr = 15°C
h = 12 W/m².K
Ceramic plate
-T₂ = 200°C
Welec
(A) Determine the heat emitted from the plate, as a blackbody.
(B) Determine the radiation incident on the plate from the surroundings.
(C) Determine the heat transfer from the plate to the surroundings.
(D) Determine the required electric power.
Radiation heat transfer Example:
Q1: A large slab of steel 0.1 m thick has in it a 0.1 m-diam hole, with axis normal to
the surface. Considering the sides of the hole to be black, specify the rate of radiative
heat loss from the hole in W. The plate is at 811 K, the surroundings are at 300 K.
A₁
T₁ = 811 k
-D=0.1 m-
A₂
A3
Hole
T
S=0.1 m
Chapter 13 Solutions
Fundamentals of Heat and Mass Transfer
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