What was the purpose of Watt Steam engine and how does it work?

I know that the reason why they created this was because Newcomens used too much coal, but how did they do it so it would work? And What does it do??? Im so lost plz help!

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  • 9 years ago
    Best Answer

    wikipedia:

    The Watt steam engine (alternatively known as the Boulton and Watt steam engine) was the first type of steam engine to make use of steam at a pressure just above atmospheric to drive the piston helped by a partial vacuum. Improving on the design of the 1712 Newcomen engine, the Watt steam engine, developed sporadically from 1763 to 1775, was the next great step in the development of the steam engine. Offering a dramatic increase in fuel efficiency, the new design replaced Newcomen engines in areas where coal was expensive, and then went on to be used in the place of most natural power sources such as wind and water. James Watt's design became synonymous with steam engines, due in no small part to his business partner, Matthew Boulton.

    see reference for more details.

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  • ?
    Lv 4
    9 years ago

    Note that these were both low pressure engines that used the pressure of the atmosphere against the partial vacuum created by condensing the steam to do work.

    This is the reverse of high pressure engines that use the force of high pressure steam to do the work.

    Both the Newcomen and the Watt used the pressure of the atmosphere to do the actual work.

    They filled a cylinder with low pressure steam and then condensed it to water again.

    Can you imagine a steam engine with no valves and just a piston in a cylinder with a bit of water in it?

    If you heat the cylinder the water boils and expands and as it cools it shrinks.

    Newcomen added a separate boiler with a line and a valve to supply steam instead of heating the cylinder directly.

    But the steam entering the cylinder still had to warm up the cylinder until it quit condensing the steam and the cylinder still had to be cooled to condense the steam.

    As the steam condensed the standard atmospheric pressure pushed the piston into the cylinder.

    Opening the steam valve let more low pressure steam in which let the weight of the pump pull the piston out of the cylinder, and you could let the steam condense into water again as the outside air pushed the piston in again doing more work.

    There was a second valve that you could open to drain the water out when it got too full.

    The Newcomen engine wasted energy because the cylinder had to be heated up and chilled every time it cycled.

    Watt added an outlet to a dedicated steam condenser instead of just a drain valve.

    When you opened the second valve the steam condensed in the condenser instead of in the cylinder.

    It was much faster and much more effective. The condenser chilled the steam well enough that it sucked it out of the cylinder, creating a stronger vacuum.

    More importantly it meant the cylinder could stay hot instead of needing to be cooled and reheated every cycle.

    Source(s): Can you imagine a steam engine with no valves and just a piston in a cylinder with a bit of water in it. If you heat the cylinder the water boils and expands and as it cools it shrinks. Newcomen added a separate boiler with a line and a valev to supply steam instead of heating the cylinder directly. But the steam entering the cylinder still had to warm up the cylinder until it quit condensing the steam and the cylinder still had to be cooled to condense the steam.
  • 9 years ago

    water exerts pressure..even if its in the form of steam...due to the pressure it exerts...energy is produced there by enabling to get power to move the automobile or whatever the object might b..simple logic..steam generates energy

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