Cycles for closed systems

Question 1

What are the four assumption for power cycles?

Answer 1

No friction
No heat loss
All expansion and compression procession takes place in a quasi-equilibrium manner
Neglect kinetic and potential energies working on the fluid

Question 2

What is the air standard assumption?

Answer 2

• Treated as an ideal gas and the specific heat is a constant
• All processes are internally reversible
• The combustion process is replaced by a heat-addition process from an external source
• The exhaust process is replaced by a heat-reduction process that restores the working fluid to its initial state