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Water Desalination Plant . Obtaining reliable fresh water supplies from challenging water sources. Engineering Design Loop Steps. Engineers look for opportunities in problems society faces Generate ideas on how to address the identified need

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Presentation Transcript
Water desalination plant

Water Desalination Plant

Obtaining reliable fresh water supplies from challenging water sources


Engineering design loop steps
Engineering Design Loop Steps

Engineers look for opportunities in problems society faces

Generate ideas on how to address the identified need

Pick the most promising design or combination of designs

Build your design

Find out if the design meets the design specifications

Make improvements to reach or exceed design goals

Understand the need

Brainstorm designs

Select a design

Build a prototype

Test

Improve the design


Water cycle and thermal desalination process
Water Cycle and Thermal Desalination Process

  • Sun heats water in oceans, lakes, streams...

  • Water evaporates

  • Water condenses to form clouds

  • Rain falls back to the Earth

  • Hot plate heats water in desalination plant

  • Water evaporates

  • Ice forces vapor to condense

  • Water is collected in plant


A failed desalination plant design

full foil cover

ice

plastic container

evaporated water

condensed water falling into saltwater

saltwater

no. 10 tin can

hot plate

A Failed Desalination Plant Design

  • Hot plate boils off water

  • Vapor condenses on the bottom of the plastic container

  • Condensate falls back into the saltwater mixture

This design fails because the clean water falls back into the saltwater.


Your objective
Your Objective

  • Design a desalination plant

  • Use a saltwater circuit to test the efficiency of the plant

  • Improve the design until the plant reaches the design specifications

Design specifications: Your plant should be able to significantly remove the salt content from a saltwater mixture. Test you plant using the saltwater circuit.



References
References

  • Thirsty? How ‘bout a cool, refreshing cup of seawater?,USGS Water Science for Schools. Updated March 29, 2010. U. S. Geological Survey, U.S. Department of the Interior. Accessed May 1, 2010. http://ga.water.usgs.gov/edu/drinkseawater.html

  • Wikipedia.org, Wikipedia Foundation Inc., Water Desalination. Accessed May 1, 2010. http://wikipedia.org


Image sources
Image sources

  • Desalination plant sketch by Juan Ramirez Jr., ITL Program, College of Engineering, University of Colorado at Boulder (2009)

  • Water drop photo from Microsoft Clipart


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