HE: Otto Cycle

Question 1

Draw the p-v & t-s diagrams for the Otto Cycle

Answer 1

p-v:
v1 = v4
v1 = v3
t-s:
v = constant

Question 2

Otto Cycle: Thermal Efficiency (η)

Answer 2

η(th) = q(in) - q(out) / q(in)

Question 3

Otto Cycles: Name the 4 Stages.

Answer 3

1-2: Isentropic Compression
2-3: Constant volume heat addition
3-4: Isentropic Expansion
4-1: Constant volume heat rejection

Question 4

Otto Cycle: Equation for q(in) and q(out)

Answer 4

q(in) = u3 - u2 // c ( T3 - T2)

q(out) = u4 - u1 // c ( T4 - T1)

Question 5

Otto Cycle: Compression Ratio.

Answer 5

r = CR