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The 12 in. thick walls of a furnace are maintained at 2300°F on the inside. What is the energy loss from a square 6 in. by 6 in. duct cut in one of the walls? Assume that the sides of the duct are reradiating surfaces and use the uniform irradiation assumption. Take the room outside the furnace to be a black enclosure at 85°F.
consider a copper-nickel cu-ni couple similar to the one shown in fig. 6.1a in the book. this couple was held at about
what is the annual energy consumption associ- ated with heating the water to a storage temperature of 55°C? For a unit electrical power cost of $0.18/kW · h
an adiabatic condenser a heat exchanger in a steam power plant accepts steam at 25 kpa and quality of 95 and at a mass
consider a plane wall experiencing transient 1-d heat conduction in x-direction. draw the temperature profile t as a
a gas-turbine power plant operates on a simple brayton cycle with air as the working fluid. the air enters the turbine
The stresses at a point in plane stress on a sheet metal roof were found to be sigma_xx = 10 ksi (C), sigma_yy = 20 ksi (C) and Tau_xy = 30 ksi using matrix methods a) determine the normal and shear stresses on a plane passing through the point that ..
in a crystallin material slip occurs preferentially along planes having higher planar densities. for a material with an
Design a hollow steel shaft to transmit 225 kw of power at 80 rpm without exceeding a shearing stress of 60 MPa. Consider only torsion and assume that there are no stress concentrations. Make the ratio of the outside diameter to the inside diameter t..
An ideal gas, with temperature independent Cp=(7/2)R, at 15c and having an initial volume of 60m^3, is heated at constant pressure (P=0.1013 MPa) to 30c by transfer of heat from a reservoir at 50c. Calculate delS(gas), delS(heat reservoir), delS(univ..
Carbon dioxide (CO2) gas enters a turbine operating at steady state at 50 bar, 500 K with a velocity of 50 m/s. The inlet area is 0.02 m2. At the exit, the pressure is 20 bar, the temperature is 440 K, and the velocity is 10 m/s.
a very wide sheet of 7075-t651 aluminum plate 8mm thick is found to have a single-edge through-the-thickness crack 25
A power cycle receives 1120 Btu by heat transfer from a reservoir at 1080o F and discharges energy by heat transfer to a reservoir at 280 o F. The thermal efficiency of the cycle is 68% of that for a reversible power cycle operating between the same ..
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