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1. A steam turbine receives 5 kg/s steam at 400?C, 10 MPa. One flow of 0.8 kg/s is extracted at 3 MPa as saturated vapor, and the remainder runs out at 1500 kPa with a quality of 0.975. Find the second-law efficiency of the turbine.
2. Calculate the irreversibility for the process described in Problem 4.154, assuming that heat transfer is with the surroundings at 17?C.
Problem 4.154
A mass-loaded piston/cylinder shown in Fig.P4.154, containing air, is at 300 kPa, 17?C with a volume of 0.25 m3, while at the stops V = 1 m3. An air line, 500 kPa, 600 K, is connected by a valve that is then opened until a final inside pressure of 400 kPa is reached, at which point T = 350 K.
The bottom of a triangular channel is designed to be the best hydraulic section for critical flow at a depth of 1.25m; the sidewalls above the bottom section are vertical and the same width as the triangular section.
Measurements of water-balance components have been made for a one-year period on a lake with an area of 4.4 km2 with the following results: P = 350 mm, Qsi = 2.33 x 107 m3, Qgi = 2.2 x 105 m3, Qgo = 0.6 x 105 m3, and Qso = .10 x 107 m3.
The Pomdeterra wastewater treatment plant produces thickened sludge that has a suspended solids concentration of 3.8%. They are investigating a filter press that will yield a solids concentration of 24%.
Obtain copies of your local zoning ordinance and building code (they may be in your library). Look up the applicable provisions of these documents for a specifi c site and building.
A relatively unfit worker with resting heart rate of 80 beats/min starts his job of palletizing boxes. At the morning break, an industrial engineer quickly measures the worker’s
A dry cleaning establishment buys 500 gal of carbon tetrachloride every month. as a result of the dry cleaning operation, most of this is lost to the atmosphere and only 50 gal remain to be disposed of.
A gravity thickener receives 33.000 Lpd of wastewater sludge and increases the solids content from 3.0% to 7.0% with 90% solids recovery. Calculate the volume of thickened sludge.
What mass (in grams) of steam at 100°C must be mixed with 387 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 26.0°C? The specific heat of water is 4186 J/kg·K. The latent heat of fusion is 333 kJ/kg, ..
Raw primary sludge at a solids concentraion of 4% is mixed with waste activated sludge at a solids concentration of .5%. The flows are 20 and 24 gal/min respectively. What is the resulting solids concentration
A 300 acre parking lot has a runoff coefficient of 0.8 and a time of concentration of 40 minutes. Using the rational method (Q=CIA), what is peak Q if a 4"/hr rain falls for 10 minutes
A carbon steel tank, 6ft. inside diameter X 10 ft. long with a 3/8 inch wall, is sitting on evenly spaced rolls and 4 evenly spaced supports (2 on each side). What is the horizontal force excerted on the supports
What return period must an engineer use in the design of a bridge opening for a 50% risk that flooding will occur at least once in two consecutive years? Repeat for a risk of 100%.
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