The absolute pressure in a tank is 115 kPa and the local ambient absolute pressure is 1 0 2 kPa . If a U-tube with mercury (density = 13550 kg/m 3 ) is attached to the tank to measure the gauge pressure, what column height difference will it show?
The absolute pressure in a tank is 115 kPa and the local ambient absolute pressure is 1 0 2 kPa . If a U-tube with mercury (density = 13550 kg/m 3 ) is attached to the tank to measure the gauge pressure, what column height difference will it show?
The absolute pressure in a tank is
115 kPa
and the local ambient absolute pressure is
1
0
2 kPa
. If a U-tube with mercury (density
=
13550
kg/m
3
) is attached to the tank to measure the gauge pressure, what column height difference will it show?
13.44 The end of a cylindrical liquid cryogenic propellant
tank in free space is to be protected from external
(solar) radiation by placing a thin metallic shield in
front of the tank. Assume the view factor Fts between
the tank and the shield is unity; all surfaces are diffuse
and gray, and the surroundings are at 0 K.
Tank
T₁
Shield, T
T₁ = 100 K
E1
Solar
irradiation
Gs
ε₁ = ε₂ = 0.05
ε₁ = 0.10
Gs = 1250 W/m²
E2
Find the temperature of the shield T, and the heat flux
(W/m²) to the end of the tank.
question 664 thank you
13.38 Consider the attic of a home located in a hot climate.
The floor of the attic is characterized by a width of
L₁ = 8 m while the roof makes an angle of 0 = 30° from
the horizontal direction, as shown in the schematic.
The homeowner wishes to reduce the heat load to the
home by adhering bright aluminum foil (ε = 0.07) onto
the surfaces of the attic space. Prior to installation of
the foil, the surfaces are of emissivity & = 0.90.
Attic
A2, 82, T2 0 = 30°
A1, E1, T₁
土
L₁ = 8 m
(a) Consider installation on the bottom of the attic
roof only. Determine the ratio of the radiation heat
transfer after to before the installation of the foil.
(b) Determine the ratio of the radiation heat transfer
after to before installation if the foil is installed
only on the top of the attic floor.
(c) Determine the ratio of the radiation heat transfer if
the foil is installed on both the roof bottom and the
floor top.
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