Single-Family Housing Stock. DE-AC36-08GO28308 NREL Job Task Analysis: Energy Auditor Duct location is a key parameter for this efficiency improvement because there is not a great benefit to sealing or insulating ducts located in conditioned space, which are often inaccessible. See resstock.nrel.gov for more information on using the software, and to learn how to partner with NREL or third-party consultants on additional analyses. For this analysis, smart thermostats were modeled in a way analogous to programmable thermostats rather than attempting to model the specific control algorithms of one or more brands of smart thermostat and the associated occupant behavior patterns that would drive those control algorithms. Thus, the cost of this improvement only includes the additional material and labor costs associated with the insulation; the removal of old siding and installation of new siding is not included. Thus they are applicable to homes without existing duct systems. NREL/TP-5500-68670, 2017. http://www.nrel.gov/docs/fy18osti/68670.pdf, This work was supported by the U.S. Department of Energy Building Technologies Office and the We advance the science and engineering of energy efficiency in buildings, schools, communities, and districts by optimizing energy systems and renewable technologies. The energy efficiency of dehumidifiers is measured by its energy factor, in liters of water removed per kilowatt-hour (kWh) of energy consumed or L/kWh. More details on the methodology and input assumptions can be found in the NREL technical report, Energy Efficiency Potential in the U.S. Researchers from the U.S. Department of Energy’s National Renewable Energy Laboratory (NREL) and the University of New South Wales achieved a new world-record efficiency for two-junction solar cells, creating a cell with two light-absorbing layers that converts 32.9% of sunlight into electricity. The baseboards are also used during hours of the year when the heating load exceeds the DHP heating capacity. Blown-in attic insulation only applies to vented attics, not finished attics or cathedral ceilings. This improvement involves adding densely packed cellulose or fiberglass insulation to existing wood-framed wall cavities that are empty. The National Renewable Energy Laboratory is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. However, unlike some newer ducted CCHPs, the representative unit does not retain heat pump capacity at temperatures below 0 °F, so the scenario includes an electric resistance coil for backup heat in parts of the United States with winter temperatures reaching near or below 0 °F. Retrofit Chicago - Learn more about Chicago's cross-sector effort to drive energy efficiency in municipal, commercial, and residential buildings across the city. The Lawrence Berkeley National Laboratory's "Best Practices Guide for Residential HVAC Retrofits" also recommends a target duct leakage of less than 10% of air handler flow for duct sealing retrofits. In 2017, Mayor Rahm Emanuel commited the City of Chicago to reaching 100% renewable energy for all electricity used in municipal buildings by 2025. A conservative value of 60% load displacement was used for this analysis. NREL/FS-5500-68842 • September 2017. January 2017. Analysis approach and input assumptions are listed on the reverse side. NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. of rigid extruded polystyrene foam to the interior side of foundation walls and rim joists in finished and unfinished basements. Blown-in fiberglass and blown-in cellulose insulation have similar costs and performance,so a distinction is not made for this analysis. With this in mind, a 4 °F thermostat setback in heating mode and a 4 °F thermostat setup in cooling mode was used to model the smart thermostat in the subhourly building energy simulations. This can be done from the outside, when it is convenient to remove a row of siding, or from the inside, which requires patching the holes made in the drywall or plaster. For this scenario, the existing electric baseboards are left in place to provide this supplemental heat. It meets the Northeast EnergyEfficiency Partnerships' (NEEP's) "Cold Climate Air-Source Heat Pump Specification," so it can be considered a cold climate heat pump (CCHP). With support from the U.S. Department of Energy, NREL developed this tool to help users determine the most cost-effective retrofit measures for improving energy efficiency of existing homes. of rigid extruded polystyrene foam to the interior side of foundation walls and rim joists in crawlspaces, and seals any crawlspace vents. In homes without existing air conditioning, total energy use could increase because of new AC usage. This improvement involves installing a smart thermostat to control a home's central heating and/or cooling system. Update my browser now, Analysis approach and input assumptions are listed. NREL also performs research on photovolt Duct and air handler location are not fields available from RECS, so we infer it from foundation type. The reference for this improvement is installation of an electric furnace identical to the existing one (100% AFUE). In practice, the amount of displacement is highly dependent on occupant behavior and control strategy (set point of supplement heat relative to DHP, doors left open or closed, insulating value of the thermal enclosure, comfort preferences, etc.). Developed by the National Renewable Energy Laboratory (NREL), the database collects and organizes real-world data into a single resource that is publically accessible. NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC.