Liquid octane (C8H18) enters a steady-flow combustion

Chapter 15, Problem 83P

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Liquid octane \(\left(\mathrm{C}_{3} \mathrm{H}_{18}\right)\)\) enters a steady-flow combustion chamber at \(25^{\circ} \mathrm{C}$ and \(1 \mathrm{~atm}\) at a rate of \(0.25 \mathrm{~kg} / \mathrm{min}\). It is burned with 50 percent excess air that also enters at \(25^{\circ} \mathrm{C}\) and \(1 \mathrm{~atm}\). After combustion, the products are allowed to cool to \(25^{\circ} \mathrm{C}\). Assuming complete combustion and that all the \(\mathrm{H}_{2} \mathrm{O}\) in the products is in liquid form, determine (a) the heat transfer rate from the combustion chamber, (b) the entropy generation rate, and (c) the exergy destruction rate. Assume that \(T_{0}=298 \mathrm{~K}\) and the products leave the combustion chamber at \(1 \mathrm{~atm}\) pressure.

                                     

Equation Transcription:

Text Transcription:

(C_8H_18)

25^circC

0.25 kg/min

25^circC

1 atm

25^circC

H2O

T0=298 K

1 atm