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Steam is supplied to the first stage of a five-stage pressure-compounded steam turbine at a stagnation pressure of 1.5 MPa and a stagnation temperature of 350°C. The steam leaves the last stage at a stagnation pressure of 7.0 kPa with a corresponding dryness fraction of 0.95. By using a Mollier chart for steam and assuming that the stagnation state point locus is a straight line joining the initial and final states, determine
a. the stagnation conditions between each stage assuming that each stage does the same amount of work;
b. the total-to-total efficiency of each stage;
c. the overall total-to-total efficiency and total-to-static efficiency assuming the steam enters the condenser with a velocity of 200 m/s;
d. the reheat factor based upon stagnation conditions.
Find the equations for the trajectories for Case WB (a > 0.0 0. a2 > 40) and Case IVC (α >0. β> 0. α2 = 4β). Are the straight lines indicated in class trajectories? What are the equations describing them
Ammonia at 10ºC and mass 10 kg is in a piston cylinder with an initial volume of 1 m3. The piston initially resting on the stops has a mass such that a pressure of 900 kPa will float it. Now the ammonia is slowly heated to 50ºC. Find the final pressu..
A frictionless piston-cylinder contains 3.0 kg of H2O and is initially at 300 kPa. The initial volume is 1.0 m3. The water is heated until the temperature is 300 C. If the volume within the system reaches 1.5 m3, the piston hits a set of stops and is..
A witch lifts her cauldron of boiling liquid with a pulley system. Once the cauldron is lifted, liquid issues from two identical holes of cross-sectional area 2,000 mm2 (each) with a velocity of 30 m/s. The liquid sprays 30o below the horizontal.
The output of the signal generator is changed to a sine wave at a frequency of 2000 Hz. The power level is not changed. What is the power (in dBW) dissipated in the resistor with the filter in place between the signal generator and load resistor?
in all but a very few vehicles today crush or crumple zones are employed as a method to reduce energy transfer to the
a bar of solid circular cross section is loaded in tension by forces p. the bar has length l16in and diameter 0.50in.
an air-water vapor mixture at 0.1 mpa 30degc 80 rh has a volume of 50 m3. calculate the specific humidity dew point wet
briefly explain why porosity decreases the thermal conductivity of ceramic and polymeric materials rendering them more
1- find the decay constant of cesium-137 half-life 30.2 y then calculate the activity in becquerels and curies for a
if k 0.410-3 ft-1 determine d such that a car driving at constant speed v0180mph experiences at b an acceleration with
A fan located within the tower draws in atmospheric air at 17°C, 0.098 Pa, 60% relative humidity with a volumetric flow rate of 110 m3/min. Saturated air exits the tower at 30°C, 0.098 MPa. The power input to the fan is 8 kW. Ignoring kinetic an..
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