Based on the Building America HSP, homes with slab foundations have their ducts in the attic, homes with crawlspaces have their ducts in the crawlspaces, and homes with basements have their ducts in basements (conditioned or unconditioned). Single-Family Housing Stock. NREL is a government-owned, contractor-operated facility, and is funded through the United States Department of Energy. The ResStock software can be used to analyze additional scenarios with different input assumptions, for additional technologies, or with additional input data for specific city, state, or utility territories. This is especially significant because electric furnaces are most prevalent in hot climates. For this scenario, the existing electric baseboards are left in place to provide this supplemental heat. This LED-based pulse quantum efficiency (QE) system enables NREL to measure the spectral response of PV modules quickly and reliably, without the need to individually tab cells. This number ramps up every year through 2030, at the end of which Com Ed will achieve 21.5% cumulative persisting annual savings. rigid extruded polystyrene foam) or an R-5 insulated siding product at the time of residing. Office of Energy Policy and Systems Analysis. Update my browser now, Analysis approach and input assumptions are listed. Short, W., Packey, D., Holt, T. (1995) A Manual for the Economic Evaluation of Energy Efficiency and Renewable Energy Technologies. Supply and return duct surface area is also specified as a function of finished floor area and number of stories. 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. January 2017. Introduction to Illinois Energy Efficiency Programs. A study of 1,420 customers who installed one brand of smart thermostat found that the average nighttime setback was around 4 °F. DHP installations typically have one or two indoor units per story rather than one or more baseboards, radiators, or supply duct registers in every room. NREL's Building Energy Science team focuses on early-stage research for building energy technologies, including advanced components and efficiency strategies for new buildings and retrofits. 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 It meets NEEP's "Cold Climate Air-Source Heat Pump Specification," so it can be considered a cold climate heat pump (CCHP). 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. SAM includes financial models for the following kinds of projects: Residential building (retail electricity rates) We confirmed that this degree of setback/setup resulted in a similar range of heating and cooling energy savings as observed in field studies. 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. Rated energy factor is at inlet condition of 80 deg-F DB and 60% RH. Ducts with existing insulation (typically R-4, R-6, or R-8) do not have any insulation added. The reference for these improvements is based on the current federal standard for furnaces of 82% for oil. Wind Energy Follow NREL 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 . Analysis approach and input assumptions are listed on the reverse side. By accessing the database, the user agrees to the terms and conditions of use. Illinois Utilities now have Accelerated Energy Efficiency Targets. 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. For this analysis, duct leakage is defined as the fraction of air handler fan flow rate that leaks out of pressurized supply ducts into unconditioned space, plus the fraction of fan flow rate that leaks into depressurized return ducts from unconditioned space, plus any leakage into or out of the air handler itself (all measured at 25 pascals pressure difference). U.S. Energy and Employment Report, Analysis approach and input assumptions are listed here. Thus it is common to supplement the "point-source" heat they provide with another heat source. Analysis approach and input assumptions are listed on the reverse side. Operated by the Alliance for Sustainable Energy, LLC Office of Energy Efficiency and Renewable Energy The original “legacy” data center had an annual energy consumption as high as 2,394,000 kWh and the overall utilization rate was less than 5%. of rigid extruded polystyrene foam to the interior side of foundation walls and rim joists in finished and unfinished basements. This inverter-driven heat pump is representative of ducted VSHPs currently on the market. The Building Performance Institute, which sets quality assurance and technical standards for home performance professionals, recommends 10% as the maximum allowable duct leakage. This improvement involves installing a new high-efficiency variable-speed heat pump (VSHP) (SEER 22, HSPF 10) upon failure of the existing centrally ducted electric furnace. 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. Holes for adding insulation are drilled in each wall cavity (every 16 inches). Dennis Schroeder / NREL Energy efficient windows are an important consideration for both new and existing homes. National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401 303-275-3000 • www.nrel.gov Contract No. The following resources provide more information about the data and allow you to download the data. Photo by Dennis Schroeder/NREL. It meets NEEP's "Cold Climate Air-Source Heat Pump Specification", so it can be considered a cold climate heat pump. Thus, 10% was used as the post-retrofit duct leakage value for this analysis. Both the heat pump and reference replacement furnace capacities are sized in accordance with ANSI/ACCA Manuals J and S, except that the heat pump is sized based on the larger of the heating or cooling loads ("cold climate sizing") rather than the cooling load priority specified by Manual S. Heat pumps provide both heating and cooling, so in homes that have existing air conditioning,these improvements provide cooling energy savings in addition to the heating energy savings. If 'Auto' is entered, BEopt will use ENERGY STAR criteria to determine the energy factor. Single-Family Housing Stock. Homes with two or more stories are assumed to have 35% of their supply ducts within conditioned space. 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. 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. 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. Wilson, E., et al. The reference for this improvement is installation of an electric furnace identical to the existing one (100% AFUE). This foundation insulation improvement adds R-10 (2 in.) In homes without existing air conditioning, total energy use could increase because of new AC usage. NREL researchers developed a more efficient pathway for the generation of high-octane gasoline and jet fuel blendstocks from biomass. This improvement involves adding densely packed cellulose or fiberglass insulation to existing wood-framed wall cavities that are empty. This improvement involves installing a new high-efficiency variable-speed heat pump (SEER 22, HSPF 10) upon failure of the existing centrally ducted oil furnace. Researchers at the National Renewable Energy Laboratory (NREL) are rethinking WEC designs to provide a new pathway for the development of next-generation cost-competitive systems. The results of this analysis assume a siding replacement rate that ranges from 10% of 1980s homes to 50% of pre-1950s homes (see Wilson et al. Single-Family Housing Stock. This improvement is applied to all homes with vented attics with existing insulation that is less than R-49. These improvements were assumed to be triggered by failure of the existing furnace; if instead they were triggered by failure of a home's AC, the economics would be similar or better. Heat gain and heat loss through windows are responsible for 25%–30% of residential heating and cooling energy use. This improvement brings the R-value of attic floor insulation up to R-49. An alternative would be to retain the existing fuel-fired furnace for backup heat, but that scenario is not considered in this analysis. 2017 for details). 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. And it offers a custom map of spectral response at different locations. Note that local codes may require more than R-10 when insulating foundation walls. Blown-in attic insulation only applies to vented attics, not finished attics or cathedral ceilings. Single-Family Housing Stock. The System Advisor Model (SAM) is a performance and financial model designed to estimate the cost of energy for grid-connected power projects based on installation and operating costs and system design in order to facilitate decision making for people involved in the renewable energy industry. 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… Duct and air handler location are not fields available from RECS, so we infer it from foundation type. We considered an alternative scenario using a less efficient (and less expensive) SEER 14, HSPF 8.2 heat pump instead of the high-efficiency heat pump described here; however, that scenario provided lower economic potential in almost all regions (using both NPV>0 and SPP<5 thresholds). 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). This inverter-driven heat pump is representative of ducted VSHPs currently on the market. The heat pump is sized in accordance with ANSI/ACCA Manuals J and S, except that the heat pump is sized based on the larger of the heating or cooling loads ("cold climate sizing") rather than the cooling load priority specified by Manual S. Heat pumps provide both heating and cooling, so this improvement provides cooling energy savings in homes that already have cooling (room ACs or, less commonly, central AC). Department of Energy. NREL/TP-462-5173. Learn more about the database. Retrofit Chicago - Learn more about Chicago's cross-sector effort to drive energy efficiency in municipal, commercial, and residential buildings across the city. The Chicago Renewable Energy Challenge Program is a new initiative designed to accelerate the adoption of renewable energy across every neighborhood in Chicago. More details on the methodology and input assumptions can be found in the NREL technical report, Energy Efficiency Potential in the U.S. This improvement also includes adding R-8 insulation to any uninsulated ducts located in unconditioned space. Energy Efficiency Potential in the U.S. Find a Job Explore our current job postings, which include research positions and other career opportunities in a variety of fields. This improvement involves adding R-5 of rigid foam sheathing (e.g., 1-in. This improvement could alternatively be triggered by failure of a home's AC, in which case the economics would be similar or better. Prepared by Eric Wilson and Noel Merket, NREL, and Erin Boyd, U.S. Department of Energy Office of Energy Policy and Systems Analysis. Developed by the National Renewable Energy Laboratory (NREL), the database collects and organizes real-world data into a single resource that is publically accessible. In 2017, Mayor Rahm Emanuel commited the City of Chicago to reaching 100% renewable energy for all electricity used in municipal buildings by 2025. 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. NREL receives funding from Congress to be applied toward research and development projects. Energy used by Illinois single-family homes that can be saved through cost-effective improvements. 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 NREL/FS-5500-68816 • September 2017 × Energy Efficiency Potential in the U.S. Publications NREL/FS-5500-68842 • September 2017. Wilson, E., et al. 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. View webinar slides and recording from a Building America webinar presented on March 29. ResStock is free, open source, and publicly available, with the large-scale simulations running on Amazon cloud computing. 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 NREL/FS-5500-68842 • September 2017 × Point of contact: Thus they are applicable to homes without existing duct systems. http://www.nrel.gov/docs/fy18osti/68670.pdf, Energy Efficiency Potential in the U.S. SLOPE is developed and maintained by the National Renewable Energy Laboratory with funding and support from the U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy. Abstract. Single-Family Housing Stock, National Residential Efficiency Measures Database, https://basc.pnnl.gov/resource-guides/mini-split-ductless-heat-pumps, https://basc.pnnl.gov/resource-guides/continuous-rigid-insulation-sheathingsiding, https://basc.pnnl.gov/resource-guides/rigid-foam-insulation-existing-exterior-walls, https://basc.pnnl.gov/resource-guides/unvented-crawlspaces-and-conditioned-basements, https://basc.pnnl.gov/resource-guides/blown-insulation-existing-vented-attic, Btu per year gas, propane, and fuel oil savings. We advance the science and engineering of energy efficiency in buildings, schools, communities, and districts by optimizing energy systems and renewable technologies. The National Renewable Energy Laboratory, located in Golden, Colorado, specializes in renewable energy and energy efficiency research and development. The baseboards are also used during hours of the year when the heating load exceeds the DHP heating capacity. 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. Beginning in 2018, Com Ed will achieve 7.8% cumulative persisting annual electric savings. Energy used by Washington single-family homes that can be saved through cost-effective improvements, Washington existing jobs in energy efficiency (2016)1, 1U.S. Differences in approach or format of results may make comparisons to other efficiency potential analyses invalid. Find NREL-developed data sets, maps, models, and tools used for the analysis of energy and energy efficiency technologies. The unit used for this analysis has one of the highest efficiencies on the market - SEER 27 and HSPF 11.5. Get Involved. 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.). HPC Energy Research files: 2, dataset size: 3.69 GB dataset id: d332818f-ef57-4189-ba1d-beea291886eb This improvement involves sealing and insulating any HVAC supply and return ductwork that is outside of conditioned space. 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. This arrangement allows a private entity to operate the lab on behalf of the federal government. There is a lack of good data on the range of duct leakage in existing homes, but one field study found an average of 21% leakage. The System Advisor Model (SAM) is a performance and financial model designed to estimate the cost of energy for grid-connected power projects based on installation and operating costs and system design in order to facilitate decision making for people involved in the renewable energy industry. The analysis results presented here used the following approach and input assumptions. To learn more, read our blog. 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 NREL/FS-5500-68827 • September 2017 × For this analysis, we assume that finished basements are heated and cooled, whereas unfinished basements are not directly heated or cooled. Other studies have used values ranging from 60%-80% displacement of the heating load. R-38 and R-60 options were also considered, but this R-49 option had the largest economic potential for this state. The incorporation of variable-geometry components may hold the key to the elusive combination of increased energy capture and reduced structural costs. DHPs are a subset of mini-split heat pumps that use a wall-, floor-, or ceiling-mounted indoor unit to distribute heated and cooled air. of rigid extruded polystyrene foam to the interior side of foundation walls and rim joists in crawlspaces, and seals any crawlspace vents. Gain insights on the methodology and view national- and state-level results in the NREL Technical Report, Energy Efficiency Potential in the U.S. For full details, see NREL/TP-5500-68670, 2017. NREL also performs research on photovolt Explore the links below to learn more about Chicago’s energy efficiency and renewable energy strategies and how you can help. NREL: National Residential Efficiency Measures Database Home Page The National Residential Efficiency Measures Database is a publicly available, centralized resource of residential building retrofit measures and costs for the U.S. building industry. The National Renewable Energy Laboratory released a fifth volume in its Electrification Futures Study series. This improvement involves installing one or more high-efficiency ductless heat pumps (DHPs) in homes heated with electric baseboards. The National Residential Efficiency Measures Database is a publicly available, centralized resource of residential building retrofit measures and costs for the U.S. building industry. DE-AC36-08GO28308 NREL Job Task Analysis: Energy Auditor Update your browser to view this website correctly. 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