A gasoline engine is converted to run on propane as shown in Fig. P13.144. Assume the propane enters the engine at 25°C, at the rate of 40 kg/h. Only 90% theoretical air enters at 25°C, so 90% of the C burns to form CO₂ and 10% of the C burns to form CO. The combustion products, also including H₂O, H₂, and N₂, exit the exhaust pipe at 1000 K. Heat loss from the engine (primarily to the cooling water) is 120 kW. What is the power output of the engine? What is the thermal efficiency?

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C3H8 gas 90% theo air Internal combustion engine V-gloss FIGURE P13.144 Combustion + products out Wnet