Lecture 11

Question 1

What cycle can you not use h-s diagram for?

Answer 1

Carnot Cycle

Question 2

What cycle is T-s diagram useful for?

Answer 2

Carnot

Question 3

Which cycle is h-s diagram useful for?

Answer 3

Brayton

Question 4

What are Maxwell relations?

Answer 4

Second derivatives of thermodynamic potentials

Question 5

What four maxwell relations are important for this courese?

Answer 5

Internal energy, Enthalpy, Gibbs energy, Helmholtz free energy

Question 6

What are thermodynamic potentials?

Answer 6

State functions that together with the corresponding equation of state describe the equilibrium behavior of a system as a function of natural variables

Question 7

What is Helmholtz free energy?

Answer 7

Maximum work from system at constant temperature

Question 8

When is Helmholztz energy minimized at constant temperature?

Answer 8

Equilibrium

Question 9

What is Helmholtz free energy?

Answer 9

Maximum work from system at constant temperature and pressure

Question 10

What is enthalpy of vaporization?

Answer 10

Heat released when phase change from liquid to gas

Question 11

What are three import lines in phase diagrams?

Answer 11

Vaporization, fusion, sublimatio

Question 12

When is the compressibility factor approximately 1?

Answer 12

When p < 0.1 p_critical

or

T > 2 T_crit and p < 7 P_crot