Calculating Efficiency and Work in Otto Cycle Engine

[JasonHathaway]

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- r^1-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 cycleW=eff. * Q = 0.5534 * 350

W=193.72 kJ --> The work done

 

[ehild]

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%.