Solar flux of 900 W / m 2 is incident on the top side of a plate whose surface has a solar absorptivity of 0.9 and an emissivity of 0.1. The air and surroundings are at 17 ∘ C and the convection heat transfer coefficient between the plate and air is 20 W / m 2 ⋅ K . Assuming that the bottom side of the plate is insulated, determine the steady-state temperature of the plate.
Solar flux of 900 W / m 2 is incident on the top side of a plate whose surface has a solar absorptivity of 0.9 and an emissivity of 0.1. The air and surroundings are at 17 ∘ C and the convection heat transfer coefficient between the plate and air is 20 W / m 2 ⋅ K . Assuming that the bottom side of the plate is insulated, determine the steady-state temperature of the plate.
Solar flux of
900
W
/
m
2
is incident on the top side of a plate whose surface has a solar absorptivity of 0.9 and an emissivity of 0.1. The air and surroundings are at
17
∘
C
and the convection heat transfer coefficient between the plate and air is
20
W
/
m
2
⋅
K
. Assuming that the bottom side of the plate is insulated, determine the steady-state temperature of the plate.
Consider a large plane wall of thickness L = 0.8 ft and thermal conductivity k = 1.2 Btu/h-ft-°F. The
wall is covered with a material that has an emissivity of ε = 0.80 and a solar absorptivity of a =
0.60. The Inner surface of the wall is maintained at T₁ = 524 R at all times, while the outer surface
is exposed to solar radiation that is incident at a rate of q solar = 300 Btu/h-ft2. The outer surface
is also losing heat by radiation to deep space at O K.
0
Plate
a solar
o = 0.1714 x 10-8 Btu/h ft2 R4
Sun
If the temperature of the outer surface of the wall is 556.39 R, determine the rate of heat transfer through the wall
when steady operating conditions are reached. (Round your answer up to 2 decimal places.)
51 Btu/h-ft2 (per
The rate of heat transfer through the wall when steady operating conditions are reached
unit area)
7.Consider a person standing in a room maintained at 20°C at all times. The inner surfaces of the walls, floors, and ceiling of the house are observed to be at an average temperature of 12°C in winter and 23°C in summer. Determine the rates of radiation heat transfer between this person and the surrounding surfaces in both summer and winter if the exposed surface area, emissivity, and the average outer surface temperature of the person are 1.6 m2, 0.95, and 32°C, respectively.
A cylindrical tube has an inner diameter of 2 cm and a wall thickness of 1 cm. The tube is evacuated. In the center, there is a radiation source along its axis that sends 1e^5 W/m^2 to the inner surface of the tube. K for the tube wall is 2 W/m K. If the outer surface of the tube is cooled with water at 298 K with a convective heat transfer coefficient of 100 W/m^2 K, determine the minimum temperature rating for the tube material for safe operation.
Automotive Technology: Principles, Diagnosis, And Service (6th Edition) (halderman Automotive Series)
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