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A 100 ft2 wall consists of 4 in of red brick (k = 0.38 Btu-ft/hr-ft-°F), 1...
A wall is constructed of two layers of sheetrock (k = 0.10 Btu/hr-ft-F°) separated by 12...
A wall is constructed of two layers of sheetrock (k = 0.10 Btu/hr-ft-F°) separated by 12 inches of fiberglass insulation (k = 0.020 Btu/hr-ft-F°). The two layers of sheetrock are 3/4 of an inch thick so the wall is sheetrock, insulation then sheetrock. What is the thermal resistance of this construction (there are no studs!) in units of hr-F°/Btu to three significant digits?
1.17 A thin, 0.5 inch diameter copper (k = 220 Btu / hr-ft-F) rod spans the...
1.17 A thin, 0.5 inch diameter copper (k = 220 Btu / hr-ft-F) rod spans the distance between two parallel plates 6 inches apart. Air flows in the space between the plates, providing a heat transfer coefficient of 40 Btu / hr-ft2-F at the surface of the rod. The surface temperature of the plates exceeds that of the air by 100 F. By how much does the temperature at the midpoint of the rod exceed the temperature of the air...
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of...
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of 250 F. The pipe geometry has the following dimensions: inner diameter 4" and an outer diameter 4.8". The outside surface of the pipe is cooled via convection-assume convection coefficient (h) 125 Btu/h ft2 F. If the temperature of the outer surface of the pipe is 160 F address the following: (a) develop an expression for the heat equation and associated boundary conditions and (b)...
A composite refrigerator wall is composed of 2 in of cork board sandwiched between a 1/2...
A composite refrigerator wall is composed of 2 in of cork board sandwiched between a 1/2 in thick layer of oak and a 1/32 in thick layer of aluminum lining on the inner surface. The average convection heat transfer coefficients at the interior and exterior wall are 4 and 1.5 Btu/h ft^2 F, respectively. Draw the thermal circuit.
1. A ¾ inch (nominal), Schedule 40, mild steel pipe carries 40 psia steam through a...
1. A ¾ inch (nominal), Schedule 40, mild steel pipe carries 40 psia steam through a room having an air temperature of 80°F. The pipe is covered with a 0.125 ft thick layer of fiberglass insulation having a thermal conductivity of 0.037 Btu/(h ft ‘F). The hi value on the steam side of the pipe is 1000 Btu/h ft2 °F. The ho value on the outside of the insulation is 2.0 Btu/(h ft2 ’F). For the mild steel, k=26Btu/(ft H...
Heat Transfer Problems 1. A window pane (1/8 inch thick) in an old house owned by...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
A 15-foot steel (k 7.2 Btu/h ft F) pipe is carrying steam at a temperature of 250 F. The pipe geometry has the following dimensions: inner diameter 4" and an outer diameter 4.8". The outside surface of the pipe is cooled via convection-assume convection coefficient (h) 125 Btu/h ft2 F. If the temperature of the outer surface of the pipe is 160 F address the following: (a) develop an expression for the heat equation and associated boundary conditions and (b)...
Heat Transfer
Problems 1. A window pane (1/8 inch thick) in an old house owned by a professor is 3 ft. by 4 ft. He likes to be warm in the winter so the inside temperature is kept at 70 °F even when the outside temperature is 10 •F. For this problem assume the inside and outside temperatures are for the window surface. How much heat is transferred through the window (k=.54 BTU/hr ft ° F)? 2. A small heated...
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