Bohm Stirling engine Base measurements: 156 mm x 108 mm x 130 mm, 1 Kg Base plate:
beech Working rpm: 2000 - 2500 rpm/min, to regulate as slowly run Bearing application:
6 high-class ball-bearings Material: screw, side parts total stainless steel Cylinder
brass Rest aluminium, stainless steel The Bohm HB12 Stirling engine is available
in both ready built and kit form. The power comes from a small spirit burner, once
lit just watch this amazing Stirling engine run! The Stirling engine works by the
repeated heating and cooling of a sealed amount of working gas, usually air or other
gases such as hydrogen or helium. The gas follows the behaviour described by the
gas laws which describe how a gas' pressure, temperature and volume are related.
When the gas is heated, because it is in a sealed chamber, the pressure rises and
this then acts on the power piston to produce a power stroke. When the gas is cooled
the pressure drops and this means that less work needs to be done by the piston to
recompress the gas on the return stroke, giving a net gain in power available on
the shaft. The working gas flows cyclically between the hot and cold heat exchangers.