Lecture 6

Question 1

What are the two types of Brayton cycles?

Answer 1

Open and closed

Question 2

What is the relation between work produced by turbine and work needed by compressor?

Answer 2

Work produced by turbine = work needed by compressor

Question 3

What are the assumptions of diffusers and nozzles?

Answer 3

Steady, adiabatic, no work done

Question 4

What is the coefficient of performance used for?

Answer 4

Refrigerators

Question 5

What are assumptions for throttle?

Answer 5

No work done
Adiabatic
Isenthalpic

Question 6

What are assumptions for turbine

Answer 6

Work done by fluid
Adiabatic
Enthalpy changes

Question 7

What is the mean temperature useful for?

Answer 7

For approximating area under curve

Question 8

What is mean temperature form open reversible steady process without technical work?

Answer 8

T_m = h_2 - h_1 / (s_2 - s_1)

Question 9

What is mean temperature form open reversible steady process without technical work?

Answer 9

T_m = h_2 - h_1 / (s_2 - s_1-s_irr)

Question 10

What equation is the mean thermodynamic temoerature derived from?

Answer 10

Entropy balance equations

Question 11

What do internal regenerators do?

Answer 11

Use rejected heat as heat input and increase efficiency