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Find the second-law efficiency for the closed FWH in Problem 9.51.
Problem 9.51
A closed FWH in a regenerative steam power cycle heats 20 kg/s of water from 100?C, 20 MPa to 200?C, 20 MPa. The extraction steam from the turbine enters the heater at 4 MPa, 275?C and leaves as saturated liquid. What is the required mass flow rate of the extraction steam?
determine the composition of the vapor phase of this mixture. Saturation pressure of NH3 at 25°C is 1003.5 kPa.
A 33-year record of peak annual flow rates was subjected to a frequency analysis. THe median value is defined as the midvalue (50% value) in the table of rank-ordered magnitudes.
A concrete cylinder having a diameter of 6 in and a gauge length of 12 in is tested in compression the results of the test are reported in the table as load vs contraction
The bottom of piezometers A and B are on the same flow line and 1000 m apart. The bottom of piezometer A is at 130 m and its water level is 160 m. The bottom of piezometer B is at 100 m and the water level is 150 m. What is the hydraulic gradient ?
Assume the actual water temperature for calibrating a 1/3 ft3 measure was 65 degrees F. If you had used a water temperature of 75 degrees F for your calibration, how much error would there be in your volume calculation (both in ft3 and as a percen..
The pressure inside a 4 cm hose is 700 kPa. If the water exits through a 2 cm diameter nozzle, what velocity in m/s, can be expected inside the hose ?
Your engineering consulting firm has been asked to determine the specific weight of an unknown material. You decide to use the concept of buoyancy to figure this out. So you weigh the material in both air and water.
A toll booth on a turnpike is open from 8:00AM to 12 Midnight. Vehicles start arriving at 7:45AM at a uniform deterministic rate of six per minute until 8:15AM and from then on at two per minute
Determine the masses of dry air and the water vapor contained in a 240-m3 room at 98 kPa, 23°C, and 50 percent relative humidity.
An engineer in a developing country observes that his project bankaccount has grown from 1,600,000 to 1,769,279 (local currencyunits) in 20 days with no deposits or withdrawals being made.
A stack (T=550 F and P=750 mmHg) was sampled using EPA Method 5. The total gas volume that flowed through the dry gas meter was 2.785 cubic meters (at T=60 F and P=800 mmHg).The mass of particles collected was 1.50 g.
Using estimates of rainfall, evaporation, and water consumption, the town engineer developed the following model of the water volume in the reservoir as a function of time
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