The volume of argon gas in a reciprocating cylinder is 0.2 m3, its pressure is 600 kPa,
Question:
- The volume of argon gas in a reciprocating cylinder is 0.2 m3, its pressure is 600 kPa, and its temperature is 320 K. Argon gas expands to a pressure of 300 kPa at constant temperature.
a ) Calculate the work done during the expansion. What happens to heat exchange?
b ) Calculate the work done and heat exchange if the expansion is based on reversible polytropic PV 1.85 = steady state change.
c ) Calculate the work done if the expansion is performed according to the reversible adiabatic process.
d ) Show the phase changes in a , b and c , constant temperature curves, constant pressure curves, work and heat exchanges in P-V and T-S diagrams. Compare the values of work and heat exchanges.
e ) Calculate the entropy changes in the processes a , b and c .
HOW TO SOLVE THIS QUESTIONS? ANSWERS BELOW
a) m = 1,802 kg , W12a = 83,18 kJ ,
Q12a = W12a
b) W12b = 38,47 kJ , Q12b = -10,63 kJ ),
c) W12c = 43,63 kJ , Q12c =0) , d ) ΔS12a = 0,2600 kJ/K
ΔS12b = - 0,0386 kJ/K , ΔS12c = 0 )
Introductory Econometrics A Modern Approach
ISBN: 978-0324660548
4th edition
Authors: Jeffrey M. Wooldridge