Otto cycle solved numericals with explanation.

Otto cycle solved numericals with explanation.

1.Otto cycle PV and TS diagrams:

Contents

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2. Processes:

Process4-1:  constant volume heat rejection.

Process 2-3: constant volume heat addition.

Process3-4: Reversible adiabatic expansion.

Process1-2: Reversible adiabatic compression.

3.formulas

          heat addition:

                    Q_in=C_V*(T₃-T₄)

         heat rejection:

     
                   Q_R=C_V*(T₄-T₁)

         

         efficiency:

                      Efficiency=1-Q_R/Q_in

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

Where,

r =v1/v2=compression or expansion ratio.

4.SOLVED NUMERICALS WITH EXPLAINATION

Q1.The compression ratio of the otto cycle is 7.the amount pf heat added during compression stroke is 30kJ/kg.and initial condition of at the beginning of compression stroke is 350 k and 0.1 mpa. find out thermal efficiency and workdone of otto cycle?

Answer:

Q2.The minimum and maximum volumes in the Otto cycle are 150 and 800 c.c find its thermal efficiency?

Answer: