A common superheater is a group of parallel pipes with their surfaces exposed to the hot gases in the boiler furnace. The steam may be further heated by passing it through a superheater on its way from the boiler to the engine. The most efficient performance-that is, the greatest output of work in relation to the heat supplied-is secured by using a low condenser temperature and a high boiler pressure. For high efficiency, the steam must fall through a wide temperature range as a consequence of its expansion within the engine. The remainder of the heat may be allowed to escape, or, for maximum engine efficiency, the steam may be condensed in a separate apparatus, a condenser, at comparatively low temperature and pressure.
In a steam engine, hot steam, usually supplied by a boiler, expands under pressure, and part of the heat energy is converted into work. Our earliest human ancestors invented the wheel, but who invented the ball bearing that reduces rotational friction? Let the wheels in your head turn while testing your knowledge of inventors and their inventions in this quiz.
0 kommentar(er)
