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NIFA Conference 2011 “Solar Innovations”

NIFA Conference 2011 “Solar Innovations”. by Dr. Bing Chen University of Nebraska-Lincoln Passive Solar Research Group. Passive Solar Design Principles. Prairie Gold Homes - Base (24’x42’) with 2x4 stud walls.

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NIFA Conference 2011 “Solar Innovations”

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  1. NIFA Conference 2011“Solar Innovations” by Dr. Bing Chen University of Nebraska-Lincoln Passive Solar Research Group

  2. Passive Solar Design Principles

  3. Prairie Gold Homes - Base (24’x42’) with 2x4 stud walls • R-13 walls and R-20 roof, BLC = 8191 BTU/degree-day in Chadron, NE (6774 DD) with indoor design temp of 70°F and outdoor design temp of -3°F. • Yearly load = 52.6 M BTU or 1535 KWH @ $0.10/kwh = $1535 annual heating bill TIF = 7.2 BTU/DD-SF Base Case:

  4. PGH Base with additional insulation and larger windows - south view (Cost: $6,500) Solar Version with Insulation: • R-30 walls and R-50 roof and 60 SF south windows and R-3 all windows • Yearly load = 12.85 BTU or 3750 KWH or $375 annual heating bill TIF = 1.9 • ROI = $6.5K /( $1535-$375) = 5.6 years

  5. PGH Base - sunspace with insulation addition - south view (Cost: $12,500) Sunspace (e.g., 15’x8’) Solar Version with Insulation: • 120 SF sunspace @ $50/SF Yearly load = 12.8 MBTU or 3730 KWH (not insulated), 9.4 BTU or 2750 KWH (insulated) • Annual heating bill $373 ($275 insulated) ROI = $12.5K / ($1535 - $275) = 10 years

  6. Solar Example: Malibu 5 Beach House - Pacific Coast - $1.3M http://www.ecofriend.org/entry/eco-architecture-kanner-architects-malibu-5-home-keeps-you-close-to-nature/

  7. Solar Example: Jerry McElroy Home - Straw bale construction with passive solar - Direct gain - Colorado http://renewablepowersolarenergy.com/solar-power/passive-solar-design

  8. Modular-Prefab Home Example - Wee house - Minnesota - $45k http://www.sbkinc.com/weblog/2006/05/the_modular_vacation_home_the.html

  9. Modular-Prefab Home Example - First LivingHome - Designed by Ray Kappe - Certified LEED Platinum - Approx. $230/sqft http://www.thedailygreen.com/green-homes/latest/modular-homes-green-building-gorgeous

  10. Conclusions • Passive Solar is a low-cost option that should be considered in residential construction with prefabrication • Payback times can be 5 years or less • “Green” and renewables are “in” and may be strong selling points to customers of all economic levels • Different solar options include different passive techniques, PV for power, active flat plates for domestic hot water heating

  11. References • Path to Passive: Nebraska’s Passive Solar Primer • Bing Chen et al., 1982 • http://www.neo.ne.gov/publications/pathtopassive.htm • Nebraska Residential Solar Architecture • Bing Chen et al., 1983 • http://www.neo.ne.gov/publications/solar_architecture.htm

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