Brayton Cycle

Question 1

What is the four stages of the Brayton cycle?

Answer 1

1) Isentropic compression
2) Constant pressure heat addition
3) Isentropic expansion
4) Constant pressure heat rejection

Question 2

Using the first law of thermodynamics, what is the work process 1 to 2 of the Brayton cycle?

Answer 2

q12=0
Standard air assumption:
h2-h1=cp(T2-T1)
w12=-cp(T2-T1)<0

Question 3

Using the first law of thermodynamics, what is the work process 2 to 3 of the Brayton cycle?

Answer 3

w23=0
Enthalpy:
h3-h2=cp(T3-T2)
q23=cp(T3-T2)

Question 4

Using the first law of thermodynamics, what is the work process 3 to 4 of the Brayton cycle?

Answer 4

q34=0
Enthalpy:h4-h3=cp(T4-T3)
w34=-cp(T4-T3)>0

Question 5

Using the first law of thermodynamics, what is the work process 4 to 1 of the Brayton cycle?

Answer 5

w41=0
Enthalpy:h1-h4=cp(T1-T4)
q41=cp(T1-T4)<0

Question 6

What is the thermal efficiency equation?

Answer 6

n=1-1/(r^(y-1)/y