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Major Systems Affecting Building Energy Performance: Major Systems Affecting Building Energy Performance Building Envelope Air-tightness, Insulation levels Water-management Windows and Glazing Systems Glazing SHGC Overall 'U' Value Heating, Ventilation, and Air Conditioning Equipment sizing, efficiency and location Duct tightness, distribution effectiveness, and location Major Systems Affecting Building Energy Performance: Major Systems Affecting Building Energy Performance Domestic Hot Water Generation Distribution Stand-by-losses Appliances Refrigerator, dishwasher, clothes washer/dryer Lighting and miscellaneous Panelized Advanced Framing: Panelized Advanced Framing Panelized Advanced Framing 2 x 6 Walls @24' OC Low-e Windows Foamed Stud Cavities with Blown in Cellulose (R-23) Inside-The Envelope AHU Foamed and Insulation Buried Ducts Affordable and Starter Homes HERS 89 Outlook Construction Atlanta, GA Slide5: Panelized Advanced Framing Reduces Framing Cost and increases Level of insulation Reduces on-Site Labor and Construction Time Requires Additional Planning, But Improves Systems Integration Insulation-Buried Ducts: Insulation-Buried Ducts Computer Modeling of Heat Flow From Insulation Buried Duct Section Through Foamed Over Insulation Buried Duct Slide7: Buried Duct Benefits Improves air distribution efficiency Provides additional air-sealing at joints and registers Reduces Peak load allowing a smaller system to be used Cost of foam can be offset by reduced cost of HVAC PANELIZED WALL AND ROOF SYSTEMS: PANELIZED WALL AND ROOF SYSTEMS 25 Home In-fill Development Panelized SIP Construction R-24 Walls R-40 Roofs 92 AFUE Furnaces Mastic Sealed Ducts 1.2-kW PV Solar Systems Low-e Windows EnergyStar Appliances Compact Fluorescent Lighting Controlled Ventilation Claretian Associates South Chicago, Il Slide9: Panelized Wall and Roof Systems: Panelized Wall and Roof Systems Cement Board Structural-Insulated-Panels Aluminum-Skinned SIP Roof Construction Structural-Steel Moment-Frame at Centerline Sold as Pre-Engineered Kit to Builder Standard and Custom Designs Available Low-Cost and Durable Homefront Homes Slide11: Cement Board SIP Panels Hardie® 5/16' thick cement board laminated to both sides of 4' thick polystyrene foam Cuts construction time by up to 75% High minimum R values with R-20 walls and R-30 roof No wood used in the home construction to avoid moisture and termite damage Panelized Wall Construction System: 3 days to complete the building shell Home Front: Home Front Home Front homes proved exceptionally resilient when Hurricane Charley struck in August, 2004 Before Hurricane One mile away…. After Hurricane Unvented Crawlspace: Unvented Crawlspace Improved Energy Efficiency Improved Indoor-Air-Quality Low-e Glass Windows: Low-e Glass Windows Low-e glass blocks out most long-wave radiation (heat) while allowing most of the short-wave radiation (light) to enter. Typical Costs: Typical Costs Extra cost for 300 SF low-e coating on double glazing: $300. Savings in downsizing AC by ½ ton: $275. Net cost: $25. Additional Benefits of Low-e Windows: Additional Benefits of Low-e Windows Reduced cooling load needs smaller HVAC system Smaller HVAC system means lower air-flows, and simpler pressure balancing By being more closely matched to both peak and non-peak cooling loads better dehumidification is achieved (Improves IAQ and inhibits mold growth) HVAC Optimization: HVAC Optimization 'Right-Sized' HVAC Manual J with no oversize Compact design avoids ducts in outside walls Less opportunity for leaks and losses Less costly to install Better able to achieve air-flows Slide18: OPTIMIZED HVAC Mercedes Homes Townhouses Melbourne, Florida Concrete and Panelized Construction Low-e windows Integrated HVAC AHU in Conditioned-space EnergyStar Qualified Down-Sized HVAC: Down-Sized HVAC Single Zone 1.5 Ton Capacity Heatpumps Compact Distribution First and Second Floor Returns Fresh-Air Duct Slide20: OPTIMIZED HVAC COMFORT TESTING Tankless Gas Water-Heater: Tankless Gas Water-Heater ECO-Block Walls Fly-Ash Concrete Low-e Windows Integrated Compact HVAC SEER 17 A/C Tankless Water-Heater and Hydro-coil AHU HERS 95 Madera I Model Home, Gainesville, Florida Takagi T-KD20 Cost and Benefits: Cost and Benefits Saves Space: Much smaller than a storage tank Saves Energy: Stand-by losses are eliminated. Operating efficiency improves by 30% to 40% Saves Energy: For space heating, .84 AFUE is higher than standard furnace at .80 AFUE Incremental cost increase is about $600. Very short initial pay-back, and immediate positive cash flow. Heat Pump Water Heater: Heat Pump Water Heater Installed in a home in Melbourne, Florida WatterSaver Integrated HPWH by ECR International, Inc. (product introduced Fall 2002) Monitoring began in April 2002 3-person household (2 adults andamp; toddler) Preliminary Findings: Preliminary Findings Reliable Performance Homeowners very pleased 62% kWh savings $10/month savings at local electric rates of $.077/kWh Energy-Efficient Lighting, Appliances, and Controls: Energy-Efficient Lighting, Appliances, and Controls Takoma Village, Washington, DC Takoma VillageWashington, D.C.: Takoma Village Washington, D.C. Other Sustainable Features Energy Efficient Lighting Low-VOC Paints and Finishes Fiber-Cement Siding Recycled-Content Carpets Horizontal-Axis Clothes Washer Tubular Skylights Putting It All Together: Putting It All Together Warwick Grove, Warwick, NY Putting It All Together: Putting It All Together Advanced Framing Unvented Crawlspace Low-E Windows Optimized HVAC 92% Condensing Furnace 13 SEER Air-Conditioning Tankless Gas Water-Heater EnergyStar Appliances HERS 89 -90! You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.