Carnot Engine

  • When the working substance is an ideal gas and it is subjected to cyclic process consisting of isothermal expansion adiabatic expansion isothermal compression and adiabatic compression then such heat engine is called carnot engine.
  • For carnot engine efficiency is independent of nature of working substance. It depend only on temperature of source and sink.
  • For carnot engine the source and sink should have infinite thermal capacities.

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1. Carnot devised an ideal cycle of operation for a heat engine, called carnot's cycle.

\frac{\theta_{2}}{\theta_{1}} = \frac{T_{2}}{T_{1}}

2. Therefore, efficiency of the cycle is
\eta = 1 - \frac{T_{2}}{T_{1}}