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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 four cylinder two stroke diesel engine has a cut-off ratio of 1.8 and a compression ratio of 22. it operates with an
the cylinder is made from steel where yield stress= 240 MPa and v=0.3. Subsequently sketch the hoop and radial stresses in the wall of the cylinder.
describe the principle of operation for watts flyball governor. include the relevant block diagram and indicate the
gears a and b have a mass of 50kg and 15kg respectivly. their radii of gyration about their respective centers of mass
you are working in a company that has developed a process to produce dna vaccines from e.coli. after the fermentation
temperature in state college pa on 31st december 2012 was 22 f. if the barometric pressure was 100 kpa and the humidity
What load P allow can be supported at the midpoint of the bar if the yield stress in the steel wires is 220 MPa and in the aluminium wire is 80 MPa? A saftey factor of n = 2 is needed.
Estimate the time necessary to achieve the same concentration at a 5.3-mm position for an identical steel and at the same carburizing temperature.
if ice homogeneously nucleates at -58.5oc calculate the critical radius given values of -3.1 times 108 jm3 and 25 times
25 washers have a combined mass of 1 lb. how much money is recovered per day from the sale of scrap washers?
at the beginning of the compression process of an air-standard diesel cycle operating with the compression ratio r 18
a 5 ft3 tank containing steam at 14.7 psia 1 quality is fitted with a relief valve. heat is transferred to the tank
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