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A steam boiler heats liquid water at 200 ºC to superheated steam at 4 MPa and 400 ºC. Coal fuel from Utah which has an ultimate analysis (by mass) as 61.40 percent C, 5.79 percent H2, 25.31 percent O2, 1.09 percent N2, 1.41 percent S, and 5.00 percentash (non-combustibles) is burned steadily with 50 percent excess air. The fuel and air enter the boiler at 25 ºC and the products of combustion leave at 227 ºC. Determine the amount of steam generated per unit of fuel mass burned, the change in the exergy of the combustion streams, in kJ/kg fuel and the steam stream, in kJ/kg steam, and the lost work potential, in kJ/kg fuel. Neglect the effect of the sulfur in the energy and entropy balances.
a jet engine is a serial combination of a compressor an adiabatic constant pressure combustor and a turbine in that
Find the safe applied torque that can be transmitted by the shaft ABCD, if the maximum shear stress in the hollow section is 47 MPa and G = 82.5 GPa.
the position of an object is moving along an x axis is given by x3t - 4t2t3 where x is in meters and t is in
a tennis racket hits a tennis ball with a force of where 1230 500 and is the time in milliseconds. the ball is in
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In order to increase production rate a reactor set point was increased from 160 psig to190 psig. The reactor pressure transmitter was recalibrated from 0-200 psig to 0-300 psig.
water flows into a volume that contains a sponge with a flow rate of 0.02 m3s. it exits the volume through two tubes
a vapor in a cylinder is compressed frictionlessly from 20 to 60 psia in such a manner that pvconstant. the initial
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