Otto Cycle

Question 1

What are the four stages of the Otto cycle?

Answer 1

Isentropic Compression
Constant volume, heat addition
Isentropic expansion
constant volume, heat rejection

Question 2

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

Answer 2

q12=0
change in u=-w12
212=(p2V2-p1V1)/1-y

Question 3

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

Answer 3

w=0

u=q=c(T3-T2)

Question 4

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

Answer 4

u=c(T4-T3)=-w

Question 5

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

Answer 5

u=q41=c(T1-T4)

Question 6

What is the equation for the efficiency of the Otto cycle?

Answer 6

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