An air-standard Diesel cycle absorbs 1500 J⋅mol⁻¹ of heat (step DA of Fig. 8.10, which simulates combustion). The pressure and temperature at the beginning of the compression step are 1 bar and 20°C, and the pressure at the end of the compression step is 4 bar. Assuming air to be an ideal gas for which C_P = (7/2)R and C_V = (5/2)R, what are the compression ratio and the expansion ratio of the cycle?

Figure 8.10

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A. Figure 8.10: Air-standard Diesel cycle. Volume Pressure