1 / 6

Steam Engine

Steam enters chamber from left, leaving from right. Steam Engine. both valves closed, piston moves to the right. Sliding valve. Steam enters from right, leaving from left piston moves back to the left. Simple steam power plant cycle. Heat in. Work out. Heat in. Work out. Work in

Download Presentation

Steam Engine

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Steam enters chamber from left, leaving from right Steam Engine both valves closed, piston moves to the right Sliding valve Steam enters from right, leaving from left piston moves back to the left

  2. Simple steam power plant cycle Heat in Work out Heat in Work out Work in by pump Condensing back to iquid form for easy transportation Heat out to cooling water

  3. Phase Change Constant pressure process Superheated steam Above critical point, there is no clear distinction between liquid and vapor phases Saturated water liquid+vapor Melting vaporization Compressed (subcooled) liquid sublimation

  4. T V p T p Constant pressure line Constant temperature lines v

  5. (a) P-v diagram: Along the constant temperature line, increasing vapor pressure will lead to higher density (lower specific volume) due to compression. After it reaches the saturation pressure at that temperature, the vapor will condense into liquid while the pressure remains constant until all vapor condense into liquid. (b) T-v diagram: Along the constant pressure line, increasing liquid temperature will lead to lower density (higher specific volume) due to thermal expansion. At the saturation temperature, the liquid will vaporize into gaseous form at a constant pressure until all liquid vaporize.

  6. Melting/freezing p P-T phase diagram Substances that contract on freezing Substances that expand on freezing ex. Water. Higher pressure makes it more difficult to freeze, thus requiring lower freezing temperature. The reverse is true for substances that contract on freezing Critical point liquid solid Vaporization/condensation vapor T Triple point: all three phases coexist in equilibrium Sublimation Critical point: A limiting state above which there is no clear distinction between liquid and vapor phases.

More Related