Consider a curing kiln whose walls are made of 30-cm-thick concrete with a thermal diffusivity of a = 0.23 * 10-5 m2/s. Initially, the kiln and its walls are in equilibrium with the surroundings at 6°C. Then all the doors are closed and the kiln is heated by steam so that the temperature of the inner surface of the walls is raised to 42°C and the temperature is maintained at that level for 2.5 h. The curing kiln is then opened and exposed to the atmospheric air after the steam flow is turned off. If the outer surfaces of the walls of the kiln were insulated, would it save any energy that day during the period the kiln was used for curing for 2.5 h only, or would it make no difference? Base your answer on calculations.
Consider a curing kiln whose walls are made of 30-cm-thick concrete with a thermal diffusivity of a = 0.23 * 10-5 m2/s. Initially, the kiln and its walls are in equilibrium with the surroundings at 6°C. Then all the doors are closed and the kiln is heated by steam so that the temperature of the inner surface of the walls is raised to 42°C and the temperature is maintained at that level for 2.5 h. The curing kiln is then opened and exposed to the atmospheric air after the steam flow is turned off. If the outer surfaces of the walls of the kiln were insulated, would it save any energy that day during the period the kiln was used for curing for 2.5 h only, or would it make no difference? Base your answer on calculations.
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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Question
Consider a curing kiln whose walls are made
of 30-cm-thick concrete with a thermal diffusivity of
a = 0.23 * 10-5 m2/s. Initially, the kiln and its walls are in equilibrium
with the surroundings at 6°C. Then all the doors are closed
and the kiln is heated by steam so that the temperature of the inner
surface of the walls is raised to 42°C and the temperature is maintained
at that level for 2.5 h. The curing kiln is then opened and
exposed to the atmospheric air after the steam flow is turned off.
If the outer surfaces of the walls of the kiln were insulated, would
it save any energy that day during the period the kiln was used for
curing for 2.5 h only, or would it make no difference? Base your
answer on calculations.
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