The Otto in this cycle run by most car engines. Otto cycle is depicted in the gr

Question

The Otto in this cycle run by most car engines. Otto cycle is depicted in the graph: The efficiency of this ideal Otto cycle can be expressed as = 1 - T_4 - T_1/T_3 - T_2 where these are the temperatures of the corresponding points en the graph. Find the efficiency of an ideal Otto cycle with temperatures T_1 = degree C, T_2 = 80 degree C, T_3 = 144 degree C, and T_4 = 70 degree C. Since the ideal Otto efficiency depends only on temperature values, does that mean that an ideal Otto cycle is necessarily a Carnot cycle? Explain your answer.

Explanation / Answer

Given data; T1 = 23 degree C, T2 = 80 degree C

T3 = 144 degree C, T4 = 70 degree C

(a) Efficiency of ideal otto cycle

n0 = 1 - (T4-T1/T3-T2)

= 1 - (70-23/144-80)

= 1 - 0.734

= 0.265 degree C

= 503.261 J

(b) Carnot Cycle

Carnot cycle is a reversible cycle where a working fluid goes under a cycle with working process Isothermal heat addition, Icentropic expansion, Isothermal heat rejection and finally Icentropic compression.

Carnot cycle has the most efficiency of all the working cycle present in the world because its each process is nearly reversible. Heat Engines work on the Carnot Cycle while Refrigerator and Heat Pumps work on revers Carnot engine.

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