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HVAC Equipment Efficiency Overview

Explore HVAC equipment efficiency overview, components like expansion valves, compressors, fans, and heat exchange coils, duct systems, and supply plenums, and learn about SEER ratings, common heating system types, duct leakage issues, and proper duct design for optimal performance.

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HVAC Equipment Efficiency Overview

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  1. Building Performance Matters HVAC Equipment Efficiency Overview

  2. HVAC Components

  3. 1 Expansion valve 2 Fan 3 Compressor 4 Heat exchange coils Condenser HVAC Components:

  4. 1 Heat exchange coils 2 Fan 2 1 Air Handler HVAC Components:

  5. Duct System HVAC Components:

  6. Duct System HVAC Components: Supply Ducts Supply Plenum Air Handler Return Grille Return Plenum

  7. Air Conditioner Efficiencies S easonal E nergy E fficiency R atio Minimum SEER = 10 Btu’s/Whr for central home systems

  8. Air Conditioner Efficiencies SEERs range from 10 to over 18 for very efficient AC units. Going from SEER 10 to SEER 14 for example, will reduce cooling energy costs by about 30%.

  9. Common Heating System Types • Electric Strip • Heat pump • Gas Furnace

  10. Common Heating System Types • Electric Strip • Uses either baseboard or air handler mounted electric resistance strips • Low installation cost but least efficient option.

  11. Common Heating System Types • Electric Strip • Heat pump • Air conditioner refrigeration cycle in reverse (heats home instead of cooling it). • Cost effective vs. electric strip in all regions except very warm.

  12. Common Heating System Types • Electric Strip • Heat pump • Gas Furnace • Burns natural gas or liquid propane • Similar efficiency to heat pumps

  13. Duct Leakage

  14. Duct Leakage

  15. Duct Leakage

  16. HVAC-induced infiltration Duct Leakage Infiltration rates - Florida Duct Study 1990

  17. Duct Leakage

  18. Duct Leakage Research 1990 • Florida • 50 all electric homes • 13% total building leakage in duct system • 17% savings • $200 cost

  19. Closing interior doors when AHU fan on fan off fan on Door Closure House air changes per hour (ach)

  20. Duct Design Problems • Utility room door that swings to the return grill. • When the system turns on, the door is pulled to the grill, blocking air flow.

  21. Summary HVAC efficiency includes: • Selecting efficient air conditioning based on your climate. • Selecting the proper type of and efficiency heating system for your climate • Designing and sealing air distribution systems properly.

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