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For a reversible engine operating between T₁ and T₂, the net efficiency is derived from the heat exchanged during two isothermal processes…
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The Carnot cycle is an ideal reversible heat-engine cycle with four processes — isothermal expansion at T1, adiabatic expansion, isothermal compression at T2 and adiabatic compression back to T1. Working between a hot reservoir T1 and a cold reservoir T2, its efficiency η = 1 − T2/T1 — the maximum any engine can achieve between these two temperatures.
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