Question

A closed system containing R-134a initially at 280 kPa and 30 °C undergoes a reversible isothermal process, after which its quality is 0.40. (a) What is the specific heat and work transfer, q and w, experienced by the system? (b) Sketch the process on a T-s diagram, labeling the states and the isobars.

Answer #1

1-kg of R-134a initially at 600 kPa and 25 °C undergoes a
process during which the entropy is kept constant until the
pressure drops to 100 kPa. Determine the final temperature of the
R-134a and the final specific internal energy.

A system consisting of 2 kg of water initially at 130°C, 10 bar
undergoes an internally reversible, isothermal expansion during
which there is energy transfer by heat into the system of
700 kJ.
Determine the final pressure, in bar, and the work by the
system, in kJ.

1 mole of a gas undergoes a mechanically reversible isothermal
expansion from an initial volume 1 liter to a final volume 10 liter
at 25oC. In the process, 2.3 kJ of heat is absorbed in the system
from the surrounding. The gas follows the following formula:
V=RTP+b where V is the molar specific volume, and Tand Pare
temperature (abosolute) and gas pressure respectively. Given R=
8.314 J/(mol.K) and b= 0.0005 m3. Evaluate the following a) Work
(include sign) b) Change...

a. One mole of an ideal monoatomic gas (closed system, Cv,m)
initially at 1 atm and 273.15 K experiences a reversible process in
which the volume is doubled. the nature of the process is
unspecified, but the following quantities are known, deltaH=2000.0J
and q=1600.0J. Calculate the initial volume, the final temperature,
the final pressure, deltaU, and w for the process.
b. Suppose the above gas was taken from the same initial state
to the same final state as in the...

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