William Zoeller, R.A.

Transcription

1 HERS 86 (EnergyStar) minimum 30% Better Than the M.E.C. Other Considerations: Affordable; Durable; Healthy William Zoeller, R.A.

2 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

3 Major Systems Affecting Building Energy Performance Domestic Hot Water Generation Distribution Stand-by by-losses Appliances Refrigerator, dishwasher, clothes washer/dryer Lighting and miscellaneous

4 Panelized Advanced Framing Outlook Construction Atlanta, GA Panelized Advanced Framing 2 x 6 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

5 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

6 Insulation-Buried Ducts Section Through Foamed Over Insulation Buried Duct Computer Modeling of Heat Flow From Insulation Buried Duct All ducts fully buried with several inches of insulation Larger trunks barely buried and smaller branches fully buried Larger trunks partially buried R-30 R-15 R-10

7 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

8 Claretian Associates South Chicago, Il 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

9 First SIP Project in Chicago $155,000 cost for 1700 SF Home 5% Increase in Cost of Standard Construction 50% Increase in Energy Efficiency

10 Panelized Wall and Roof Systems Homefront Homes 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

11 Cement Board SIP Panels Panelized Wall Construction System: 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 3 days to complete the building shell

12 Before Hurricane After Hurricane One mile away. Home Front homes proved exceptionally resilient when Hurricane Charley struck in August, 2004

13 Improved Energy Efficiency Improved Indoor-Air Air-Quality

14 Low-e glass blocks out most long-wave radiation (heat) while allowing most of the short-wave radiation (light) to enter.

15 Extra cost for 300 SF low-e coating on double glazing: $300. Savings in downsizing AC by ½ ton: $275. Net cost: $25.

16 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)

17 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

18 OPTIMIZED HVAC Mercedes Homes Townhouses Melbourne, Florida Concrete and Panelized Construction Low-e windows Integrated HVAC AHU in Conditioned-space EnergyStar Qualified

19 Single Zone 1.5 Ton Capacity Heatpumps Compact Distribution First and Second Floor Returns Fresh-Air Duct

20 OPTIMIZED HVAC COMFORT TESTING Townhome Down Temp Up Temp Outdoor Temp Down RH Up RH Outdoor RH /18/2002 0:00 5/18/2002 2:24 5/18/2002 4:48 5/18/2002 7:12 5/18/2002 9:36 5/18/ :00 5/18/ :24 5/18/ :48 5/18/ :12 5/18/ :36 0 5/19/2002 0:00 Date & Time

21 Tankless Gas Water-Heater Takagi T-KD20 Madera I Model Home, Gainesville, Florida 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

22 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.

23 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 person household (2 adults & toddler)

24 Reliable Performance Homeowners very pleased 62% kwh savings $10/month savings at local electric rates of $.077/kWh

25 Energy-Efficient Efficient Lighting, Appliances, and Controls Takoma Village, Washington, DC

26 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

27 Warwick Grove, Warwick, NY

28 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!