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Heating and Air Conditioning I

Heating and Air Conditioning I

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Heating and Air Conditioning I

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  1. Heating and Air Conditioning I Principles of Heating, Ventilating and Air Conditioning R.H. Howell, H.J. Sauer, and W.J. Coad ASHRAE, 2005 basic textbook/reference material For ME 421 John P. Renie Adjunct Professor – Spring 2009

  2. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems • Absorption systems, steam-jet vacuum systems • Centrifugal systems • Refrigerants • Ammonia and sulfur dioxide • Halogenated hydrocarbons (temperature and application-pressure) • R-22, R-134a versus R-11 and R-12 • Discussion of properties … • Discussion of number system R-ABC

  3. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – schematic diagram

  4. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – pressure – enthalpy plot • Metering device • Evaporator • Compressor • Condenser

  5. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – pressure – enthalpy plot

  6. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – pressure – enthalpy plot – R-134a

  7. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – pressure – enthalpy plot – R-134a

  8. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – pressure – enthalpy plot

  9. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – First law of thermodynamics • QL + W = QH

  10. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems – Example • COP – “goodies”/”payment”

  11. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Vapor compression systems

  12. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Components - condenser

  13. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Components - evaporator

  14. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Components – expansion device

  15. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Summary

  16. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Summary

  17. Chapter 2 - Thermodynamics • Thermodynamic Applied to Refrigeration • Summary - performance

  18. Chapter 2 - Thermodynamics • Thermodynamic Applied to Heat Pumps

  19. Chapter 2 - Thermodynamics • Thermodynamic Applied to Heat Pumps

  20. Chapter 2 - Thermodynamics • Thermodynamic Applied to Heat Pumps - Equations

  21. Chapter 2 - Thermodynamics • Thermodynamic Applied to Heat Pumps - Equations

  22. Chapter 2 - Thermodynamics • Thermodynamic Applied to Heat Pumps – Final Comments

  23. Chapter 2 - Thermodynamics • Thermodynamic Applied to Heat Pumps – Final Comments

  24. Chapter 2 - Thermodynamics • Absorption Refrigeration Cycle • Absorption refrigeration cycles are heat-operated cycles in which the secondary fluid, the absorbent, is used to absorb the primary fluid, gaseous refrigerant, that has been vaporized in the evaporator. • Components • Typical evaporator (9-10) • Vapor absorber (11-3) generates high refrigeration concentration in fluid) • Liquid pump (3-4), increases pressure of carrier secondary fluid • Generator (1-7) boils the refrigerant out of high pressure carrier liquid • Typical condenser (7-8) subcools the gaseous refrigerant

  25. Chapter 2 - Thermodynamics • Absorption Refrigeration Cycle

  26. Chapter 2 - Thermodynamics • Absorption Refrigeration Cycle

  27. Chapter 2 - Thermodynamics • Absorption Refrigeration Cycle