heat engine Link to heading
- efficiency $$\tag{1} \varepsilon = \frac{W _{\rm output}}{W _{\rm input}} = \frac{| W |}{| Q_H| }. $$
- Carnot engine $$\tag{2} \varepsilon_C = \frac{T_H - T_L}{T_H}. $$
refrigerator Link to heading
- coefficient of performance $$\tag{3} K = \frac{W _{\rm output}}{W _{\rm input}}. $$
- Carnot refrigerator $$\tag{4} K_C = \frac{T_L}{T_H - T_L} $$