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Otto cycle engine

  • #1

Homework Statement



An Engine works within Otto cycle where the compression ratio is 6, and 350 kJ of heat was added to it. Determine the efficiency of the cycle and the work done if Cp/Cv is 1.45


Homework Equations


Efficiency Otto = (1- r1-k)
Efficiency (eff.) =Work (W) /Heat Transferred (Q)


The Attempt at a Solution



Efficiency Otto = (1- r1-k) ( r is the compression ratio, k is Cp/Cv)

= 1-61-1.45

= 0.5534 = 55.34% --> The efficiency of the cycle


W=eff. * Q = 0.5534 * 350

W=193.72 kJ --> The work done
 
Last edited by a moderator:

Answers and Replies

  • #2
ehild
Homework Helper
15,498
1,878
Your result looks fine, but use the "x2" button for an exponent. The efficiency is 1-r(1-k) instead of 1-r1-k and 1-61-1.45 is not 55.34%.
 

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