17-11-2012, 11:21 AM
Steam Engine
Steam Engine.pptx (Size: 443.54 KB / Downloads: 84)
Introduction:
A steam engine is a device that converts the potential energy that exists as pressure in steam, and converts that to mechanical forces.
Potential chemical energy stored in the coal is converted into heat by burning (a chemical reaction)
The heat is converted to mechanical energy by 1) heating water into steam, 2) steam expands to force a piston to move, 3) pistons drive a shaft that eventually makes the wheels of the train turn.
Components & Accessories of Steam Engine
Heat Sources:
The heat required for boiling the water & supply the steam can be drived from various sources.
In some cases the heat sources is a nuclear reactor or geothermal
energy.
Boilers:
Boiler are vessel that contain water to be boiled, and some kind of
mechanism for transferring the heat to the water as to boil it.
Fire-Tubeboiler:
The water partially fills a vessel below or
inside which is a combustion chamber or
furnace and fire tubes through which the
hot gases flows.
Motor Unit:
A motor unit take supply of steam at high pressure and temperature
and gives out a supply of steam at
lower pressure and temperature,
using a much of the difference in
steam energy as possible to do
mechanical work.