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The presence of a small amount of air may cause a significant reduction in the heat rate to a water-cooled steam condenser surface. For a clean surface with pure steam and the prescribed conditions, the condensate rate is 0.020 kg/m2 · s. With the presence of stagnant air in the steam, the condensate surface temperature drops from 28 to 24°C and the condensate rate is reduced by a factor of 2. For the air-steam mixture, determine the partial pressure of air as a function of distance from the condensate film.
The average wind speed on the north Texas plains around Amarillo is approximately 6 m/s. An efficient wind turbine can convert 35% of the kinetic energy of the air (wind) into electrical energy at optimum conditions. If a turbine has blades 25 m in l..
Briefly explain the following concepts related to exposure thresholds: time-weighted average, short-term exposure limit, exposure ceiling, and biological exposure indices.
a 4-in. diameter disk shown weighs 10 lb. the disk is released at rest when theta30 degrees and rolls down the curved
a boiling-water-type nuclear fission reactor has shut down the backup pumps have failed and emergency cooling water
A well-insulated rigid tank contains 1 kg of air at 30°C. A paddle wheel rotates inside the tank and increases the temperature of the air to 60°C. If the environment is at 100 kPa and 25°C, determine the exergy destroyed and the minimum work input fo..
10 mol of an ideal gas at 5 atm at 298 k is stored in an insulated piston and cylinder arrangement. at these condition
at rated thrust a liquid-fueled rocket motor consumes 180 lbms of nitric acid as oxidizer and 70 lbms of aniline as
an air standard brayton cycle has inlet conditions of 540 r and 14 .7 psia a compressor efficiencyof 85.86 and a
gas with an initial volume of 0.36 m3 is slowly compressed to a final volume of 0.16 m3 by a process during which the
Air at 300 kPa, 63oC, and a velocity of 423 m/s enters an insulated duct of varying cross-sectional area. The air exits at 150 kPa, 88oC. At the inlet, the cross-sectional area is 6.57 cm2. Assuming the ideal gas model for the air and variable specif..
A 10 lbm block is pushed down a frictionless incline with a force of 5 lbf. the incline is 30 degrees relative to the horizontal. if the block starts from rest, what is its speed after it has been pushed 12 ft. Assume that gravity is 32.0 ft/ sec^2
A window-mounted room air conditioner removes energy by heat transfer from a room and rejects energy by heat transfer to the outside air. The air conditioner cycle requires a power input of 0.434 kW and has a coefficient of performance of 6.22.
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