Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN: 9781305116399
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Textbook Question
Chapter 22, Problem 22.31P
Argon enters a turbine at a rate of 80.0 kg/min, a temperature of 800°C, and a pressure of 1.50 MPa. It expands adiabatic ally as it pushes on the turbine blades and exits at pressure 300 kPa. (a) Calculate its temperature at exit. (b) Calculate the (maximum) power output of the turning turbine, (c) The turbine is one component of a model closed-cycle gas turbine engine. Calculate the maximum efficiency of the engine.
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Steam enters an adiabatic turbine steadily at 7 MPa,500C, and 45 m/s, and leaves at 100 kPa and 75 m/s. Ifthe power output of the turbine is 5 MW and the isentropicefficiency is 77 percent, determine (a) the mass flow rateof steam through the turbine, (b) the temperature at the turbineexit, and (c) the rate of entropy generation during thisprocess.
A monatomic ideal gas initially has a temperature of 330k and preassure of 3x105 Pa. The gas expands from a volume of 500cm3 to a volume of 1500cm3.
l) Calculate the change in internal energy (in Joules), if the expansion is adiabatic.
answer => (150)ln(3)J
NOTICE : The work in adiabatic process equals the change in internal energy. So, w = - Δu = - (g/2*n*r*Δt)
The answer above is right, and was calculated using integrals. I would like to know how to calculate using Δu = g/2*n*r*Δt, since the work in adiabatic process = -Δu(change in internal energy)
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Chapter 22 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
Ch. 22 - The energy input to an engine is 4.00 times...Ch. 22 - The energy entering an electric heater by...Ch. 22 - Three engines operate between reservoirs separated...Ch. 22 - (a) Suppose you select four cards at random from a...Ch. 22 - An ideal gas is taken from an initial temperature...Ch. 22 - True or False: The entropy change in an adiabatic...Ch. 22 - The second law of thermodynamics implies that the...Ch. 22 - Assume a sample of an ideal gas is at room...Ch. 22 - A refrigerator has 18.0 kJ of work clone on it...Ch. 22 - Of the following, which is not a statement of the...
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