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