ETHR 303 Tutorial 8 Solutions - Revision
7
8/19/2019 ETHR 303 Tutorial 8 Solutions - Revision http://slidepdf.com/reader/full/ethr-303-tutorial-8-solutions-revision 1/7 ETHR 303 – Tutorial 8 Solutions 1 ETHR 303 Engineering Thermodynamics (a) Open System 1 st and 2 nd Laws Relationships Revision (Tutorial 8 Solutions) Question 1 (b) Closed System (c) Open System Question 2 (a) Saturated vapor exists at a temperature greater than the saturation temperature at a particular pressure. A saturated vapour only exists at the saturation pressure at temperature. For the latter pressure and temperature are not independent of each other. (b) 1 2 H H W Q − = − is not valid for a closed system under any condition. (c) For an adiabatic compressor Q = 0. Therefore W = - ∆U. as the gas is compressed, the internal energy increases. Since for an ideal gas U = f(T), it follows that the temperature increase. (d) No. This would represent a violation of the second law of thermodynamics. (e) The reversible work would equal the actual work for an isentropic process.
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Transcript of ETHR 303 Tutorial 8 Solutions - Revision
8/19/2019 ETHR 303 Tutorial 8 Solutions - Revision
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ETHR 303 – Tutorial 8 Solutions 1
ETHR 303 Engineering Thermodynamics
(a) Open System
1 st
and 2 nd
Laws Relationships Revision
(Tutorial 8 Solutions)
Question 1
(b) Closed System
(c) Open System
Question 2(a)
Saturated vapor exists at a temperature greater than the saturation temperature at a particular
pressure. A saturated vapour only exists at the saturation pressure at temperature. For the latter
pressure and temperature are not independent of each other.
(b)
12 H H W Q −=− is not valid for a closed system under any condition.
(c)
For an adiabatic compressor Q = 0. Therefore W = -∆U. as the gas is compressed, the internal energy
increases. Since for an ideal gas U = f(T), it follows that the temperature increase.
(d)
No. This would represent a violation of the second law of thermodynamics.
(e)
The reversible work would equal the actual work for an isentropic process.
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ETHR 303 – Tutorial 8 Solutions 2
Question 3
Question 4
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ETHR 303 – Tutorial 8 Solutions 3
Question 5
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ETHR 303 – Tutorial 8 Solutions 4
Question 6
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ETHR 303 – Tutorial 8 Solutions 5
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ETHR 303 – Tutorial 8 Solutions 6
Question 7
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ETHR 303 – Tutorial 8 Solutions 7
