Strength Of Materials
4. System Modeling/Energy Balancing The fuel chemical energy entering an engine per unit time is 200 kW. The arbitrary efficiency (i.e. fuel conversion efficiency) of the engine is 32.5%. The mechanical efficiency is 90%. The combustion efficiency is 95%. Heat losses to the coolant and oil(removed by the radiator and oil cooler combined) are 55 kW. Heat conducted to engine surfaces and convected/radiated away to ambient is estimated to be 10 kW. What percentage of the incoming fuel chemical energy becomes each of the following?Outline any assumptions you make and provide supporting calculations, diagrams, or discussion as needed. HINT: Draw a control volume around the engine and keep track of all energy flows entering/leaving. Note that some quantities refer to entities that do not leave the engine directly (i.e. they are transformed into something else).
Indicated work (predicted by in-cylinder pressure/volume data)
• Rejected heat to ambient by/from non-radiator surfaces
Friction work (dissipated between moving parts within the power train
O Exhaust chemical energy (leaving the engine in the form of un burned fuel)
g) Exhaust sensible energy (leaving the engine in the form of elevated gas temperature)
Brake work (leaving via the output shaft)
1) Rejected heat to the coolant and oil (removed by radiators)
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