HVAC Equipment Efficiency Overview Building Performance Matters.

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Presentation transcript:

HVAC Equipment Efficiency Overview Building Performance Matters

HVAC Components

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

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

HVAC Components: Duct System

HVAC Components: Supply Ducts Return Grille ReturnPlenum AirHandler SupplyPlenum Duct System

S easonal E nergy E fficiency R atio Air Conditioner Efficiencies Minimum SEER = 10 Btus/Whr for central home systems

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%.

Common Heating System Types Electric Strip Gas Furnace Heat pump

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

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.

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

Duct Leakage

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

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

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

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

Summary 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. HVAC efficiency includes: