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Problem #3 (30 point): A glass-door fire-screen has a height of 0.8 m and a width...
Problem 3 (20p) During a winter day, the window of a patio door with a height of 1.8 m and width ...
Problem 3 (20p) During a winter day, the window of a patio door with a height of 1.8 m and width of 1.0 m has a uniform temperature of 0°C. T through the window due surface is 0.94. Hint: Use the correlation relation developed by Churchill and Chu: he room wall and air temperatures are 15°C. Estimate the heat loss to free convection and radiation. Assume the emissivity of the glass Nu = 0.825 + 1 +(0.492/Pr)9/16j8/27
Problem 3 (20p)...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of...
A household oven door of 0.6-m height and 0.7-m width reaches an average surface temperature of 32°C during operation. The temperature of ambient air is 22°C. Assuming the door has an emissivity of 0.8 and the surroundings are also at 22°C, determine the heat transfer by free convection and the heat transfer by radiation. 1) What is the volumetric thermal expansion coefficient of air at the film temperature outside the oven door, in 1/K? 2) What is the Rayleigh number...
1. A vertical glass plate covers a fireplace. The plate is at a temperature of 232...
1. A vertical glass plate covers a fireplace. The plate is at a temperature of 232 C and is located in a room at 23 °C. Use an average film temperature of 400 K when finding air properties. a) Find the Raleigh number for natural (free) convection from the plate. b) Find an average convection coefficient for the plate. Use the Churchill and Chu relation. e) Find the heat loss rate to the room. W Bricks Haight L=0.71 • Plate...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k =...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Heat Transfer problem, ch9 Will give instant thumbs up! Problem 14: Also, after going over example...
Heat Transfer problem, ch9
Will give instant thumbs up!
Problem 14: Also, after going over example problem 9-2, determine the heat transfer by natural convection for the hot plate facing down with 0 = 30°. Cooling of a Plate in Different Orientations Consider a 0.6-m x 0.6-m thin square plate in a room at 30°C. One side of the plac is maintained at a temperature of 90°C, while the other side is insulated, as shown in Fig. 9-18. Determine the...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
Problem 3 (20p) During a winter day, the window of a patio door with a height of 1.8 m and width of 1.0 m has a uniform temperature of 0°C. T through the window due surface is 0.94. Hint: Use the correlation relation developed by Churchill and Chu: he room wall and air temperatures are 15°C. Estimate the heat loss to free convection and radiation. Assume the emissivity of the glass Nu = 0.825 + 1 +(0.492/Pr)9/16j8/27
Problem 3 (20p)...
1. A vertical glass plate covers a fireplace. The plate is at a temperature of 232 C and is located in a room at 23 °C. Use an average film temperature of 400 K when finding air properties. a) Find the Raleigh number for natural (free) convection from the plate. b) Find an average convection coefficient for the plate. Use the Churchill and Chu relation. e) Find the heat loss rate to the room. W Bricks Haight L=0.71 • Plate...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
Consider a 1.2-m-high and 2-m-wide double-pane window consisting of two 3-mm-thick layers of glass (k = 0.78 W/m K) separated by a 12-mm-wide stagnant air space (k = 0.026 W/m K). Determine the steady rate of heat transfer through this double-pane window. R . and all the surface temperatures (inner and outer of each pane) within the circuit (which you will draw and correctly label) for a day during which the room is maintained at 24°C while the temperature of...
Heat Transfer problem, ch9
Will give instant thumbs up!
Problem 14: Also, after going over example problem 9-2, determine the heat transfer by natural convection for the hot plate facing down with 0 = 30°. Cooling of a Plate in Different Orientations Consider a 0.6-m x 0.6-m thin square plate in a room at 30°C. One side of the plac is maintained at a temperature of 90°C, while the other side is insulated, as shown in Fig. 9-18. Determine the...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
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