Thermal Efficiency

on . Posted in Thermodynamics

Thermal efficiency, abbreviated as $$\eta_{th}$$ (Greek symbol eta), a dimensionless number, is the fraction of heat that is converted to work or desired output divided by required input.

Thermal efficiency Formula

$$\large{ \eta_{th} = \frac{ W }{ Q_H } }$$
Symbol English Metric
$$\large{ \eta_{th} }$$  (Greek symbol eta) = thermal efficiency $$\large{dimensionless}$$
$$\large{ W }$$ = work out  $$\large{ ft-lbf }$$ $$\large{J}$$
$$\large{ Q_H }$$ = heat input $$\large{\frac{Btu}{lbm}}$$  $$\large{\frac{J}{kg}}$$