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A common arrangement for heating a large surface area is to move warm air through rectangular ducts below the surface. The ducts are square and located midway between the top and bottom surfaces that are exposed to room air and insulated, respectively.
For the condition when the floor and duct temperatures are 30 and 80°C, respectively, and the thermal conductivity of concrete is 1.4 W/m · K, calculate the heat rate from each duct, per unit length of duct. Use a grid spacing with ?x = 2?y, where ?y = 0.125L and L = 150mm.
A spherical container of outer diameter 2.5 m is buried below the wrath’s surface. The distance of the center of the container to the earth surface is 10 m. The container issued to temporarily store radioactive wastes where heat is generated at a rat..
a 9-m-long steel e 200 gpa pipe column has an outside diameter of 220 mm and a wall thickness of 8 mm. the column is
If you have a plane wall separating hot and cold fluids at temperature T(infinity)1 & T(infinity)2. Using x=0 & x=L as boundary conditions, determine what the heat flux would be in terms of T(infinity)1, T(infinity)2, h1, h2, k, L.
for flow of viscous fluids through a 5 cm diameter pipe for what flow rate in m3h would we expect transition to
the unit cells of several orthorhombic crystals are described below. what is the bravais lattice of each and how do you
How many cycles will the material tolerate at a stress amplitude of +- 70MPa and zero mean stress? How will this change if the mean stress is 10 MPa? What if the mean stress is -10MPa? The tensile strength of the alloy is 200MPa.
a propeller blade section begins to cavitate when its relative velocity with respect to undisturbed water is 32 m per
a highway sign experiences a wind force f 5i - 12j - 3k n at its center of gravity 0 8 8 m. determine the moment of
one kilogram of air is compressed polytropically n1.3 from a pressure of 100 kpa to a pressure of 1 mpa as the volume
a series of cold rolling operations are to be used to reduce the thickness of a plate from 50mm down to 25mm in a
when the rubber bands of the sling shot are pulled back each rubber band is stretched 3 in. the natural length and the
if the 1500-lb boom ab the 200-lb cage bcd and the 175-lb man have centers of gravity located at points g1 g2 and g3
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