An engineer proposes to decrease the gap between the windows of double pane window to decrease heat transfer. Is it good approach or not? No, because by this way, radiation heat transfer will increase No, because by this way, current loops will be created inside the gap Yes, because by this way, less air will be trapped and therefore better insulation Not sufficient information Yes, because by this way, radiation heat transfer will decrease

An engineer proposes to decrease the gap between the windows of double pane window to decrease heat transfer. Is it good approach or not? No, because by this way, radiation heat transfer will increase No, because by this way, current loops will be created inside the gap Yes, because by this way, less air will be trapped and therefore better insulation Not sufficient information Yes, because by this way, radiation heat transfer will decrease

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.42P: Three thin sheets of polished aluminum are placed parallel to each other so that the distance...

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1.11 Calculate the heat loss through a glass window 7-mm thick if the inner surface temperature is 20°C and the outer surface temperature is 17°C. Comment on the possible effect of radiation on your answer.
Three thin sheets of polished aluminum are placed parallel to each other so that the distance between them is very small compared to the size of the sheets. If one of the outer sheets is at 280C and the other outer sheet is at 60C, calculate the temperature of the intermediate sheet and the net rate of heat flow by radiation. Convection can be ignored.
A spherical communications satellite, 2 m in diameter, is placed in orbit around the earth. The satellite generates 1000 W of internal power from a small nuclear generator. If the surface of the satellite has an emittance of 0.3, and is shaded from solar radiation by the earth, estimate its surface temperature.
Describe and compare the modes of heat loss through the single-pane and double-pane window assemblies shown in the sketch below.
1.80 Describe and compare the modes of heat loss through the single-pane and double-pane window assemblies shown in the sketch below. Problem 1.80
An engineer proposes to decrease the gap between the windows of double pane window to decrease heat transfer. Is it good approach or not? a) Yes, because by this way, less air will be trapped and therefore better insulation b) No, because by this way, radiation heat transfer will increase c) Yes, because by this way, radiation heat transfer will decrease d) No, because by this way, current loops will be created inside the gap e) Not sufficient information
Question Consider heat loss through the two walls of a house on a winter night. The walls are identical, except that one of them has a tightly fit glass window. Through which wall will the house lose more heat? Explain.
•An astronaut is at work in the service bay of a spacecraft and is surrounded by walls at -100oC. The outer surface area of the suit is 3m2. The suit has an emissivity of 0.05. Calculate the rate of heat loss when the suit’s outer temperature is 0oC How much food the astronaut has to eat to maintain the level of heat loss?
Calculate the heat loss through a 1-m by 3-m glass window 7mm thick if he inner surfacetemperatures is 20C and outer surface temperature is 17C. Sketch the figure.
A greenhouse 20m long and 15m wide has a nearly flat roof 3m above the floor level. When the sun is directly overhead the solar flux is 1,000 W/m^2. If the glass roof has an emissivity of 0.9 and the convective losses are 0.8 times the radiation losses, what is the temperature in the greenhouse?
40% of incident radiant energy on the surface of thermally transparent body is reflected back, if the transmissivity of the body be 0.15 then emissivity of the surface is–
Why does the shape of the passenger cabin windows on modern airplanes are rounded or elliptical? Why can’t it be a square or any shape that has edges? Explain and discuss your answer.