FUND OF ENG THERMODYN(LLF)+WILEYPLUS
9th Edition
ISBN: 9781119391777
Author: MORAN
Publisher: WILEY
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Determine the specific volume, in m3/kg, of ammonia at 50°C, 2 bar, using
(a) Table A-15.
(b) Figure A-1.
(c) the ideal gas equation of state.
A rigid, insulated vessel is divided into two compartments connected by a valve. Initially, one compartment, occupying 1.0 ft, contains
air at 50 lb/in?, 750°R, and the other, occupying 2.0 ft?, is evacuated. The valve is opened and the air is allowed to fill both volumes.
Assume the air behaves as an ideal gas and that the final state is in equilibrium.
Determine the final temperature of the air, in °R, and the amount of entropy produced, in Btu/°R.
Q1:
It is desired to compress one mole of air from 1 bar and 27°C to 10 bar and 27°C. For this purpose,
compare the work to be done for the following processes (sketch the processes on a P-V diagram for
each case):
(a) Isothermal compression.
(b) Constant volume heating followed by a constant pressure compression.
(c) Adiabatic compression followed by constant volume cooling.
Q2:
One mole of air at P1 and temperature T1 is compressed at constant volume till its pressure doubled.
Then it is allowed to expand reversibly and isothermally to the original pressure and finally restored to
the original temperature by cooling at constant pressure. Sketch the processes on a P-V and calculate
the net work done by the gas.
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