MEEN 315501 HW 04
1)
A 9m
3
container is filled with 300 kg of R134a at 10
℃
. What is the specific enthalpy of the R134a
in the container?
2)
Refrigerant134a at 200kPa and 25
℃
flows through a refrigeration line. Determine its specific
volume.
3)
One poundmass of water fills a container whose volume is 2 ft
3
. The pressure in the container is
100 psia. Calculate the total internal energy and enthalpy in the container.
4)
2lbm of water at 500 pisa initially fill the 1.5ft
3
left chamber of a partitioned system. The right
chamber’s volume is also 1.5 ft
3
, and it is initially evacuated. The partition is now ruptured and heat
is transferred to the water until its temperature is 200
°
F. Determine the final pressure of water, in
psia, and the total internal energy, in BTU, at the final state.
5)
Under what conditions is the idealgas assumption suitable for real gases? And what is the
difference between R and R
u
? How are these two related?
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 Fall '07
 RAMUSSEN
 Thermodynamics, 3 kg, total internal energy

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