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The authors and their partners have shown through prior efforts that this GAHP operates with a projected 140% AFUE, with operating efficiency at or better than existing GAHPs and cold climate electric heat pumps [Garrabrant, 2016].
Location Oak Ridge, Tennessee, USA Building size Two-story, 12.2 m x 12.2 m, 4.3 m floor-to-floor height Exterior walls Concrete masonry units with face brick, RUS-11 (RSI-1.9) fiberglass insulation Floor Slab-on-grade Roof Metal deck with RUS-18 (RSI-3.17) polyisocyanurate insulation Windows Double-pane clear glazing, 28% window-to-wall ratio Baseloads 9.18 W/[m.sup.2] lighting power density, 14.04 W/[m.sup.2] equipment power density Baseline HVAC 44 kW, 9.7 EER rooftop unit; 81% AFUE natural system gas furnace; VAV terminal units and electric reheat VRF system 42 kW VRF system with a DOAS Table 2: Regression models for RTU power consumption for heating season.
Included in the database (for both pre-retrofit and post-retrofit) are the furnace type and model number, fuel type, rated furnace efficiency, annual fuel utilization efficiency (AFUE), a flag indicating the presence of a DC fan motor, and estimated annual fuel consumption.
COST: $3,000 to $5,000 installed (no A/C) AFUE: 90 to 97 percent.
Since Heather is allergic to wood smoke, there are four propane fireplaces throughout the house, all with an AFUE (Annual Fuel Utilization Efficiency) rating.
Upgrade your furnace or boiler to a 95 percent AFUE unit for a credit of $150.
It has a 93 percent Department of Energy AFUE efficiency rating on the 80 to 285s model and a 91 percent DOE thermal efficiency rating on the 399 and 500 models.
* Look for high Annual Fuel Utilization Efficiency (AFUE) ratings and the Seasonal Energy Efficiency Ratio (SEER) on products.
The AFUE rating averages the amount of gas used to keep a pilot light running with the steady-state efficiency of the stove.
The basis for comparison among units is a laboratory-tested seasonal efficiency known as the Annualized Fuel Use Efficiency (AFUE) rating, and is provided on the required Energy guide fact sheet for each unit.
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