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Single Family Residential

Single Family Residential. Amanda Webb & Omar Swei Feb 04, 2011. Major Model Changes. Previous Results [Aug 2010 Model]. Chicago - 28.8% Phoenix - 5.6%. Greater savings in Phoenix than Chicago. Updated model shows this is b/c of infiltration. Infil Rates Same R-values Different.

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Single Family Residential

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  1. Single Family Residential Amanda Webb & Omar Swei Feb 04, 2011 CONCRETE SUSTAINABILITY HUB

  2. Major Model Changes CONCRETE SUSTAINABILITY HUB

  3. Previous Results [Aug 2010 Model] Chicago - 28.8% Phoenix - 5.6% Greater savings in Phoenix than Chicago Updated model shows this is b/c of infiltration

  4. Infil Rates Same R-values Different

  5. The mass does make a difference…

  6. Peaks reduced What if we add more concrete?

  7. What if we expose the concrete inside?

  8. Better in PHX Could get better with more exposed surface area?

  9. Energy Model Conclusions Infiltration, R-value, and mass benefits of ICF should be considered separately Infiltration highly climate dependent; mass somewhat climate dependent Mass makes a small difference CONCRETE SUSTAINABILITY HUB

  10. Heating-dominated (G) in Chicago vs. Cooling-dominated in Phoenix (E)

  11. Work Through Aug 2011 • What is the role of concrete in very low energy houses? • Trend in housing research (Bldg. America, BEOpt) • Trend in legislation (Greening the Codes, CA AB32) • Two targets: Net Zero Energy, Passivhaus • Two research questions to contextualize role of concrete… CONCRETE SUSTAINABILITY HUB

  12. Work Through Aug 2011 Enough to prove significance, Don’t have to build • Q1: How does mass shift the ‘PV Start Point”? • Christensen, et. al., 2004 • Consider LCA (embodied energy) – CONCRETE SUSTAINABILITY HUB

  13. Work Through Aug 2011 • Q2: Does mass make a difference in a Passivhaus? • Suggestion that thermal behavior is different • Combine Q1 & Q2: Is there a “curve” that describes the optimal use of mass? • Overall: Industry able to make intelligent decisions about how to promote use of concrete in very low energy houses. CONCRETE SUSTAINABILITY HUB

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