Results
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Fuel Energy Input
BTU/hr
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Heat to Coolant
BTU/hr
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Heat to Exhaust
BTU/hr
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Min Radiator Capacity
BTU/hr
Note: Typical engine efficiency: 25-35% gasoline, 35-45% diesel. About 1/3 of fuel energy goes to cooling. High-performance engines may reject 200,000+ BTU/hr to coolant.
Reference
Fuel Energy = Fuel Rate × BTU/gal
Gasoline: 114,000, Diesel: 129,000, E85: 76,000
Useful Work = Fuel Energy × Efficiency
Heat to Coolant ≈ 33% of fuel energy
Heat to Exhaust ≈ 40% of fuel energy
Radiator ≥ Coolant Heat × 1.2