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When raised to very high temperatures, many conventional liquid fuels dissociate into hydrogen and other components. Thus the advantage of a solid oxide fuel cell is that such a device can internally reformreadily available liquid fuels into hydrogen that can then be used to produce electrical power in a manner similar to Example 1.5. Consider a portable solid oxide fuel cell, operating at a temperature of Tfc = 800°C. The fuel cell aerogel (k = 0.006 W/m · K). The temperatures of the surroundings and the ambient are Tsur = 300 K andToo = 298 K, respectively. The outer surface is characterized by a convective heat transfer coeffi- cient of h = 12 W/m2 · K.
(b) Calculate the outer surface temperature of the can- ister for the four cases (high and low thermal con- ductivity; high and low surface emissivity).
(c) Calculate the heat loss from the cylindrical walls of the canister for the four cases.
the block is subjected to a compressive force of 2kn. determine the average normal and average shear stress developed
consider a cylinder transistor diameter 0.4 cm and length 0.5 cm that dissipated 0.2w power onto 30c transistor1
air enters a machine at 373 k with a speed of 200 msec and leaves it at the temperature of the standard sea level
you have been hired to develop a package transfer slide for a global company. the slide has length l. the slide is to
the accleration of a particle is given by a-ks2 where a is in meters per second squared k is a constant and s is in
an engine of mass 180 kg is to be supported on four helical springs. when the engine speed is 900 rpm there is a
an insulated piston-cylinder device initially contains 0.3 m3 of carbon dioxide at 200 kpa and 27 ordmc. an electric
he vapor compression heat pump operates at steady state using refrigerant 22 whose flow rate is 6kgmin. the heat pump
A vapor compression refrigeration cycle is used. The working fluid is R134a. The fluid at the compressor inlet is a superheated vapor with a pressure p1 = 200 Kpa and a temperature T1 = 10°C. The compressor pressure ratio p2/p1 = 8, the fluid exits..
A flat disk of outer radius b-125mm and inner radius a=25mm is shrink-fitted onto a shaft of radius 25.05mm. Both members are made of steel with E=200Gpa, v=0.3, and p=7.8 KN.s2/m4. Determine (a) the speed in rpm at which the interface pressure becom..
Taking the average thermal efficiency to be 34 percent, determine the amount of thermal energy rejected by the coal-fired power plants in the United States that year.
A turbine salesman makes the following claim for one of his products: Steam enters a steady-flow adiabatic turbine at 4 MPa, 600 °C with negligible velocity and exhausts at 200 kPa with a velocity of 180 m/s
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