(a) An exterior wall of a house is 3 m tall and 10 m wide. It consists of a layer of drywall with an R factor of 0.56, a layer 3.5 inches thick filled with fiberglass batts, and a layer of insulated siding with an R factor of 2.6. The wall is built so well that there are no leaks of air through it. When the inside of the wall is at 22 ℃ and the outside is at 2 ℃, what is the rate of heat flow through the wall? (b) More realistically, the 3.5-inch space also contains 2-by-4 studs—wooden boards 1.5 inches by 3.5 inches oriented so that 3.5-inch dimension extends from the drywall to the siding. They are "on 16-inch centers," that is, the centers of the studs ale 16 inches apart. What is the heat current in this situation? Don't worry about one stud mole or less.
(a) An exterior wall of a house is 3 m tall and 10 m wide. It consists of a layer of drywall with an R factor of 0.56, a layer 3.5 inches thick filled with fiberglass batts, and a layer of insulated siding with an R factor of 2.6. The wall is built so well that there are no leaks of air through it. When the inside of the wall is at 22 ℃ and the outside is at 2 ℃, what is the rate of heat flow through the wall? (b) More realistically, the 3.5-inch space also contains 2-by-4 studs—wooden boards 1.5 inches by 3.5 inches oriented so that 3.5-inch dimension extends from the drywall to the siding. They are "on 16-inch centers," that is, the centers of the studs ale 16 inches apart. What is the heat current in this situation? Don't worry about one stud mole or less.
(a) An exterior wall of a house is 3 m tall and 10 m wide. It consists of a layer of drywall with an R factor of 0.56, a layer 3.5 inches thick filled with fiberglass batts, and a layer of insulated siding with an R factor of 2.6. The wall is built so well that there are no leaks of air through it. When the inside of the wall is at 22 ℃ and the outside is at 2 ℃, what is the rate of heat flow through the wall? (b) More realistically, the 3.5-inch space also contains 2-by-4 studs—wooden boards 1.5 inches by 3.5 inches oriented so that 3.5-inch dimension extends from the drywall to the siding. They are "on 16-inch centers," that is, the centers of the studs ale 16 inches apart. What is the heat current in this situation? Don't worry about one stud mole or less.
The titanium shell of an SR-71 airplane would expand when flying at a speed exceeding 3 times the speed of sound. If the skin of the plane is 400 degrees C and the linear coefficient of expansion for titanium is 5x10 -6 /C when flying at 3 times the speed of sound, how much would a 10-meter long (originally at 0C) rod portion (1-dimension) of the airplane expand?
A square thermal window is constructed of two sheets of flat glass, each 4.00 mm thick, separated by 5.00 mm of stationary air. If the inside of the window is at 20.0 oC, the external one at -30.0 oC and the cross-sectional area of the window is 6.00 m2, determine for the steady state:
kglass= 0,80 W/(m*K); kair= 0,024 W(m*K)
a) If the air layer is removed and the two glass sheets are glued together. what's the new heat current? Is the standing air layer important?b) Discuss what would happen if the air between the two glasses were not stationary.
A perfectly insulating cylindrical glass is partially full of water. At the top of the water is a uniform layer of ice. The temperature of the water is 0 ∘C,0 ∘C, and the temperature of the air above the ice is held fixed at −19.00 ∘C.−19.00 ∘C.
If the initial thickness of the ice layer is ?i=0.0950 m and the depth of the water below the ice is ?w=0.1050 m, how long, in hours, will it take for the rest of the water to freeze? Assume that there is no transfer of heat through the sides or bottom of the glass and that the ice layer can slide freely up and down the glass.
The latent heat of fusion of water is 3.33×105 J/kg, and the thermal conductivity of ice is 2.180 W/(m⋅∘C). The density of water near freezing is 1000.0 kg/m3, and the density of ice is 917.00 kg/m3.
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