Carnot Efficiency Calculator
Calculate the theoretical maximum efficiency of a heat engine
About this calculator
The Carnot Efficiency Calculator determines the theoretical maximum efficiency of any heat engine operating between two thermal reservoirs. Named after French physicist Sadi Carnot, this fundamental thermodynamic principle establishes the upper limit for engine efficiency based solely on temperature differences. This calculator is essential for engineers, students, and researchers studying thermodynamics, power plant design, and energy conversion systems to evaluate and optimize heat engine performance against theoretical limits.
How to use
Enter the temperature of the hot reservoir (heat source) and cold reservoir (heat sink) in Kelvin, Celsius, or Fahrenheit. The calculator automatically converts temperatures to absolute scale and applies the Carnot efficiency formula: η = 1 - (T_cold/T_hot). Results show the maximum theoretical efficiency as a percentage.
Frequently asked questions
What is Carnot efficiency?
Carnot efficiency is the theoretical maximum efficiency any heat engine can achieve when operating between two thermal reservoirs at different temperatures.
Why use absolute temperature?
Absolute temperature (Kelvin) is required because the Carnot formula is based on thermodynamic temperature ratios that must use the absolute scale.
Can real engines reach Carnot efficiency?
No, real engines cannot reach Carnot efficiency due to friction, heat losses, and other irreversible processes that reduce actual performance.