2 of 3.20 A two-phase liquid-vapor mixture of a substance has pressure of 150 bar and occupies a volume of 0.2 m'. The masses of saturated liquid and vapor present are 3.8 kg and 4.2 kg, respectively. Determine the specific volume of the mixture, in m'/kg.

Elements Of Electromagnetics
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respectively.
2 of 2
3.20 A two-phase liquid-vapor mixture of a substance has
pressure of 150 bar and occupies a volume of 0.2 m'. The
masses of saturated liquid and vapor present are 3.8 kg and
4.2 kg. respectively. Determine the specific volume of the
mixture, in m'/kg.
3-76 A system consisting of 2 kg of ammonia undergoes a
cycle composed of the following processes:
Process 1-2: Constant volume from p= 10 bar, = 0.6 to
saturated vapor.
Process 2-3: Constant temperature
o
to ps- pP1. Qa-
+228 kJ.
Process 3-1:
Sketch the cycle on p-v and T-U diagrams. Neglecting
kinetic and potential energy effects, determine the net work
for the cyele and the heat transfer for each process, all in kl.
Constant pressure.
3.123 Air is confined to one side of a rigid container divide
by a partition, as shown in Fig. P3.123. The other side is
tially evacuated. The air is initially at P 5 bar, T- S00 K
and V,- 0.2 m. When the partition is removed, the i
expands to fill the entire chamber. Measurements show th
Va - 2 V and Pa= P/4. Assuming the air behaves as
ideal gas, determine (a) the final temperaature, in K, and (b) the
heat transfer, kJ.
Ovable
parti ion
O2
S bar
- 300 OK
Vacuuwm
ntially:
Pinally:
3.134 One kilogram of air in a piston-cylinder assembly
undergoes two processes in scries from an initial state where
Pi - 0.5 MPa, T,-227 C:
Process 1-2:
ume is twice the initial volume.
Constant-temperature expansion until the vol-
Process 2-3: Constant-volume heating until the pressure is
again 0.5 MPa.
Sketch the two processes in series on a p-v diagram. Assum-
ing ideal gas behavior, determine (a) the pressure at state 2.
in MPa, (b) the temperature at state 3, in "C, and for each
of the processes (c) the work and heat transfer, each in kJ.
Transcribed Image Text:respectively. 2 of 2 3.20 A two-phase liquid-vapor mixture of a substance has pressure of 150 bar and occupies a volume of 0.2 m'. The masses of saturated liquid and vapor present are 3.8 kg and 4.2 kg. respectively. Determine the specific volume of the mixture, in m'/kg. 3-76 A system consisting of 2 kg of ammonia undergoes a cycle composed of the following processes: Process 1-2: Constant volume from p= 10 bar, = 0.6 to saturated vapor. Process 2-3: Constant temperature o to ps- pP1. Qa- +228 kJ. Process 3-1: Sketch the cycle on p-v and T-U diagrams. Neglecting kinetic and potential energy effects, determine the net work for the cyele and the heat transfer for each process, all in kl. Constant pressure. 3.123 Air is confined to one side of a rigid container divide by a partition, as shown in Fig. P3.123. The other side is tially evacuated. The air is initially at P 5 bar, T- S00 K and V,- 0.2 m. When the partition is removed, the i expands to fill the entire chamber. Measurements show th Va - 2 V and Pa= P/4. Assuming the air behaves as ideal gas, determine (a) the final temperaature, in K, and (b) the heat transfer, kJ. Ovable parti ion O2 S bar - 300 OK Vacuuwm ntially: Pinally: 3.134 One kilogram of air in a piston-cylinder assembly undergoes two processes in scries from an initial state where Pi - 0.5 MPa, T,-227 C: Process 1-2: ume is twice the initial volume. Constant-temperature expansion until the vol- Process 2-3: Constant-volume heating until the pressure is again 0.5 MPa. Sketch the two processes in series on a p-v diagram. Assum- ing ideal gas behavior, determine (a) the pressure at state 2. in MPa, (b) the temperature at state 3, in "C, and for each of the processes (c) the work and heat transfer, each in kJ.
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