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Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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
Transcribed Image Text:A long pipe 5 cm in diameter passes
through a room and is exposed to air at
atmospheric pressure and temperature
of 20.C. The pipe surface temperature
is 93°C Assuming that the emissivity of
the pipe is 0.6 calculate the radiation
heat loss per meter of length of pipe
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- Using a polynomial equation solver, determine the steady-state surface temperature (Ts) of the passive radiative cooler below that is exposed to a windy convective enviroment h=40 W/m2*K and T∞= 25°C. The surrounding atmosphere is fixed at Tsur= 10°C. Set up the energy balance/conservation equation.arrow_forwardExplain why convection happens more often in gases and liquids than solids.arrow_forwardConsider a shed with an 8-ftx12-ft base and 4-ft height. The temperature of the outer surface of the roof and the walls of the shed is to be maintained at least 20°C on a quiescent night when outside temperature is 0°C and sky temperature is -15°C. What is the total heat loss heat loss from the building?Ignore the heat transfer through the ground. Assume the emissivity of the walls and roofs is 0.75.arrow_forward
- 2. A heater is a thin vertical panel 1.0m long and 0.7m high and is used in a warehouse to keep workers warm. The heater has air circulating on each side. Assume the maximum temperature of the panel is 60°C (already above the board line that is safe for human hands to touch briefly without getting hurt). Assume the room air temperature is 18°C but the warehouse wall temperature is 5°C. Model the surface with an emittance of 0.9 and Vair = 1.57x105 m²/s. a. Determine the maximum power rating for the heater. b. Now if you run the heat by standing on its side (it will be 1.0 m high and 0.7 m long), determine the surface temperature. c. Compare case a and b and explain any differences you see.arrow_forwardA one-dimensional plane wall is exposed to convective and radiative conditions at x = 0. The ambient and surrounding temperatures are T. exposed surface is a = 0.78. Determine the convective and radiative heat fluxes to the wall at x = 0, both in W/m2, if the wall surface = 20°C and Tsur = 40°C, respectively. The convection heat transfer coefficient is h = 20 W/m²-K, and the absorptivity of the temperature is T, = 30°C. Assume the exposed wall surface is gray, and the surroundings are large. gbonv i W/m? Tad i W/m2arrow_forward
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