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sci.diesel-cycle-efficiency Calculator
Calculates Diesel cycle thermal efficiency, work output, and cutoff ratio from compression ratio and heat input: η = 1 − (1/r^γ) × (r_c^γ − 1)/(γ(r_c − 1)). Diesel engines use compression ratios of 14–25 (vs 8–12 for Otto) — higher compression gives higher efficiency but requires stronger engine construction.
Inputs
Compression Ratio
Reference formula or conversion factor shown for context.
Cutoff Ratio
Reference formula or conversion factor shown for context.
Gamma
Energy to raise 1 kg of material by 1°C (J/kg·K). Water: 4,186 J/kg·K. Metals are typically 100–900 J/kg·K.
Results
ideal Diesel efficiency
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
compression ratio r
The computed compression ratio or compressive force. Higher compression ratios store more energy but increase heat and pressure.
cutoff ratio rc
The proportional relationship between two quantities.
vs Otto (petrol)
Reference formula or conversion factor shown for context.
η = 1 - (1/r^(γ-1)) × (rc^γ-1)/(γ(rc-1))
Reference formula or conversion factor shown for context.