Question

What is thermal efficiency formula?

Answer 1

Thermal efficiency: The amount of heat energy that gets converted into work or in other words the ratio of work done and the heat absorbed is known as the thermal efficiency of a heat engine.

1. It is denoted by $\eta$
2. The SI Unit of thermal efficiency is $\frac{kJ}{kg}or\frac{J}{mol}.$
3. The formula for thermal efficiency is given as

$\eta =\frac{W}{Q_{in}}=\frac{(Q_{in}–Q_{out})}{Q_{in}}$

$Q_{in}$ is the amount of heat absorbed from the source

$Q_{out}$ is the amount of heat rejected to the sink

$W$ is the work done by the heat engine