9.3 At the beginning of the compression process of an air-standard Otto cycle, $p_1$ = 1 bar, $T_1$ = 290 K, $V_1$ = 400 cm$^3$. The maximum temperature in the cycle is 2200 K and the compression ratio is 8. Determine a. the heat addition, in kJ. Answer 0.672 b. the net work, in kJ. c. the thermal efficiency. Answer 50.6% d. the mean effective pressure, in bar.
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The specific heat ratio (n) can be determined using the compression ratio (r) and the formula: n = (r^(γ-1))/γ Given that the compression ratio (r) is 8, and assuming the specific heat ratio (n) is constant, we can substitute these values into the formula: n = Show more…
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At the beginning of the compression process of an airstandard Otto cycle, $p_{1}=1$ bar, $T_{1}=290 \mathrm{~K}, V_{1}=400 \mathrm{~cm}^{3}$. The maximum temperature in the cycle is $2200 \mathrm{~K}$ and the compression ratio is 8. Determine (a) the heat addition, in $\mathrm{kJ}$. (b) the net work, in $\mathrm{kJ}$. (c) the thermal efficiency. (d) the mean effective pressure, in bar. (e) Develop a full accounting of the exergy transferred to the air during the heat addition, in $\mathrm{kJ}$. (f) Devise and evaluate an exergetic efficiency for the cycle. Let $T_{0}=290 \mathrm{~K}, p_{0}=1$ bar.
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