Hot air engine
As hot air engines different types of heat engines are referred to as external combustion engines, which use as working medium is air ( or another gas ).
Types of hot air engines are:
- Ericsson engine
- Stirling engine
- Vuilleumier heat pump
- Vacuum motor
The Industrial Louis Heinrici built the hot-air engine in 1876 as a mass product, this represented approximately the equivalent to our current electric motors dar.