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Announcement

Announcement . Rapid and Early Energy Modeling for the Engineers for a Sustainable World Shah Smith and Associates Scott Sevigny Wesley Stidham March 8th, 6pm in ETC 2.132. Objectives. Finish cooling cycles and cooling system components Learn about refrigerants.

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Announcement

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  1. Announcement • Rapid and Early Energy Modeling for the Engineers for a Sustainable World Shah Smith and Associates Scott Sevigny Wesley Stidham March 8th, 6pm in ETC 2.132

  2. Objectives • Finish cooling cycles and cooling system components • Learn about refrigerants

  3. Multistage Compression Cycles • Combine multiple cycles to improve efficiency • Prevents excessive compressor discharge temperature • Allows low evaporating temperatures (cryogenics)

  4. Systems: residential Outdoor Air Indoor Air

  5. System componentsLarge building system Water to cooling tower Water form cooling tower 25oC 35oC Plate heat exchanger 6oC 11oC Water to building Water from building

  6. Chiller

  7. Compressors

  8. Reciprocating compressor

  9. Scroll compressor http://www.youtube.com/watch?v=f_6xolDoqs0

  10. Screw compressor http://www.youtube.com/watch?v=xO7IhhzImMU&feature=related

  11. Rotary Compressor

  12. Refrigerants

  13. What are desirable properties of refrigerants? • Pressure and boiling point • Critical temperature • Latent heat of vaporization • Heat transfer properties • Viscosity • Stability

  14. In Addition…. • Toxicity • Flammability • Ozone-depletion • Greenhouse potential • Cost • Leak detection • Oil solubility • Water solubility

  15. Refrigerants • What does R-12 mean? • ASHRAE classifications • From right to left ← • # fluorine atoms • # hydrogen atoms +1 • # C atoms – 1 (omit if zero) • # C=C double bonds (omit if zero) • B at end means bromine instead of chlorine • a or b at end means different isomer

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