Compare the air-standard cycle thermal efficiencies of a diesel cycle obtained by calculating the state points around the cycle with the value obtained from Eqn (3.20) for an 'engine' operating with a compression ratio, \(r\), of \(15: 1\), and an air-fuel ratio, \(\varepsilon=28: 1\). The trapped conditions are \(1.0 \mathrm{bar}\) and \(27^{\circ} \mathrm{C}\). Assume \(Q_{p}^{\prime}=44000 \mathrm{~kJ} / \mathrm{kg}\), the specific heat capacity at constant volume, \(c_{\mathrm{V}}\), is \(0.721 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}\), and \(\kappa=1.4\). The trapped conditions are 1 bar and \(27^{\circ} \mathrm{C}\).

[56.8\%; 55.4\%]

It has been suggested in Fig. 16.2 that it is possible to evaluate the thermal efficiency of a diesel cycle by considering it to be an infinite number of incremental Otto cycles. Examine the truth of this statement by dividing the diesel cycle into 10 incremental Otto cycles.

[56.7\%]

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PbVsneyneye PLAncylcyc_PLAncylNcyc P = 1000 1000 == 60 x 1000 kW, (16.20)