) A piston-cylinder device, with the piston sitting on a set of stops, contains 8 kg R- 134a initially at 400 kPa (absolute) in a volume of 160 L (State 1). Heat is transferred to the R-T34a, and the piston starts moving when the pressure reaches 1400 kPa (abs.) (State 2). Heat transfer continues until the temperature reaches 140 °C (State 3).
) A piston-cylinder device, with the piston sitting on a set of stops, contains 8 kg R- 134a initially at 400 kPa (absolute) in a volume of 160 L (State 1). Heat is transferred to the R-T34a, and the piston starts moving when the pressure reaches 1400 kPa (abs.) (State 2). Heat transfer continues until the temperature reaches 140 °C (State 3).
Question
Please show all work and explanation/assumptions! Thanks
Transcribed Image Text:2.
A piston-cylinder device, with the piston sitting on a set of stops, contains 8 kg R-
134a initially at 400 kPa (absolute) in a volume of 160 L (State 1). Heat is transferred to the
R-134a, and the piston starts moving when the pressure reaches 1400 kPa (abs.) (State 2).
Heat transfer continues until the temperature reaches 140 °C (State 3).
a. Show the process on the P-v diagram.
b. Complete the table below (show calculations).
State
1
2
3
v (m³/kg)
0,02
120 1400
0.02
140 1400 0.021904
T(°C) P (kPa)
8.91 400
u (kJ/kg)
128.95
323.55
343, 34
343,54
X
0.38
P
3
V
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