Q: In large gas-turbine power plants, air is preheated by
In large gas-turbine power plants, air is preheated by the exhaust gases in a heat exchanger called the regenerator before it enters the combustion chamber. Air enters the regenerator at 1 MPa and...
See AnswerQ: A hair dryer is basically a duct of constant diameter in which
A hair dryer is basically a duct of constant diameter in which a few layers of electric resistors are placed. A small fan pulls the air in and forces it through the resistors where it is heated. If th...
See AnswerQ: A mercury manometer (ρ = 13,600 kg/m3
A mercury manometer (Ï = 13,600 kg/m3) is connected to an air duct to measure the pressure inside. The difference in the manometer levels is 30 mm, and the atmospheric pressure is 100 kPa....
See AnswerQ: Cold water enters a steam generator at 20°C and leaves
Cold water enters a steam generator at 20°C and leaves as saturated vapor at 200°C. Determine the fraction of heat used in the steam generator to preheat the liquid water from 20°C to the saturation t...
See AnswerQ: An ideal gas expands in an adiabatic turbine from 1200 K and
An ideal gas expands in an adiabatic turbine from 1200 K and 900 kPa to 800 K. Determine the turbine inlet volume flow rate of the gas, in m3/s, required to produce turbine work output at the rate of...
See AnswerQ: Determine the power input for a compressor that compresses helium from 110
Determine the power input for a compressor that compresses helium from 110 kPa and 20°C to 400 kPa and 200°C. Helium enters this compressor through a 0.1-m2 pipe at a velocity of 7 m/s.
See AnswerQ: Chickens with an average mass of 2.2 kg and average
Chickens with an average mass of 2.2 kg and average specific heat of 3.54 kJ/kg·°C are to be cooled by chilled water that enters a continuous-flow-type immersion chiller at 0.5°C. Chickens are dropped...
See AnswerQ: Repeat Prob. 6–143 assuming that the heat gain of
Repeat Prob. 6–143 assuming that the heat gain of the chiller is negligible. Data from Prob. 6-143: Chickens with an average mass of 2.2 kg and average specific heat of 3.54 kJ/kg·°C are to be cooled...
See AnswerQ: A refrigeration system is being designed to cool eggs (ρ =
A refrigeration system is being designed to cool eggs (ρ = 67.4 lbm/ft3 and cp = 0.80 Btu/lbm·°F) with an average mass of 0.14 lbm from an initial temperature of 90°F to a final average temperature of...
See AnswerQ: A glass bottle washing facility uses a well-agitated hot water
A glass bottle washing facility uses a well-agitated hot water bath at 50°C that is placed on the ground. The bottles enter at a rate of 450 per minute at an ambient temperature of 20°C and leave at t...
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