# Thermal Efficiency

Written by Jerry Ratzlaff on . Posted in Thermodynamics

Thermal efficiency, abbreviated as $$\eta_{th}$$, is the fraction of heat that is converted to work or desired output divided by required input.

## Thermal efficiency Formula

 $$\large{ \eta_{th} = \frac{ W }{ Q_n } }$$

### Where:

$$\large{ \eta_{th} }$$ = thermal efficiency

$$\large{ Q_n }$$ = total energy input from hot source

$$\large{ W }$$ = work