The temperature of the outer surface of the walls at 11.5 h is
Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN:9781305578296
Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Chapter2: Matter And Energy
Section: Chapter Questions
Problem 27RQ: How many Btu/h would be produced in a 12-kW electricheater?
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Consider a curing kiln whose walls are made of 0.02 m thick concrete with a thermal diffusivity of α = 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 11.5 h. The curing kiln is then opened and exposed to the atmospheric air after the steam flow is turned off. Determine the temperature of the outer surface of the walls at 11.5 h.
The temperature of the outer surface of the walls at 11.5 h is
Transcribed Image Text:6°C
42°C
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