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.
EXHIBIT 2: CENTRAL GAS FURNACES AS DESCRIBED IN DIFFERENT PROPOSALS Con- Brand Name, Model # Input Capacity tractor Model Name (BTUs) 1 Home HC/CGF/ 120,000 Comfort, E&Q 120-001 2 Home HC/CGF/ 120,000 Comfort, E&Q 120 3 Home NM 100,000 Comfort, E&Q 4 Home HC/CGF/ 100,000 Comfort, E&Q 100-001 Brand Name, Tonnage Output Model Name AFUE
Home NM 92% Comfort, E&Q Home 4 92% Comfort, E&Q Home NM 92.5% Comfort, E&Q Home NM 90% Comfort, E&Q Brand Name, Direct Vent Special Model Name Capability Air Filter Home Yes Available, extra Comfort, E&Q charge Home Yes Available, extra Comfort, E&Q charge Home Yes Available, extra Comfort, E&Q charge Home NM NM Comfort, E&Q The real model names and numbers have been changed to fictitious ones.
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.
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.