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Rapid Fire

Rapid Fire. Thermal Mass. Mass in ICF separate from infiltration, R-value benefits High heat capacity leads to thermal lag Mass lag reduces peaks Carbon, cost, energy, equipment sizing benefits Key: Optimize use of mass in building envelope and interior. Afternoon Presentation.

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Rapid Fire

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  1. Rapid Fire

  2. Thermal Mass Mass in ICF separate from infiltration, R-value benefits High heat capacity leads to thermal lag Mass lag reduces peaks Carbon, cost, energy, equipment sizing benefits Key: Optimize use of mass in building envelope and interior CONCRETE SUSTAINABILITY HUB

  3. Afternoon Presentation

  4. Residential BuildingsSingle Family & Multifamily Amanda Webb Feb 17, 2011 CONCRETE SUSTAINABILITY HUB

  5. Major Model Changes = Most significant changes *From DOE’s National Renewable Energy Laboratory **Focus in this analysis on mass benefits of ICF CONCRETE SUSTAINABILITY HUB

  6. Infil rates same – focus on mass, insul. benefits R-values different

  7. Mass portion of ICF does make a difference

  8. Peaks reduced What if we add more concrete?

  9. What if we expose the concrete inside?

  10. Better in PHX Could be better with optimized use of interior mass

  11. Infiltration sensitivity dependent on climate

  12. Operational energy dominates for benchmark building

  13. Embodied energy matters more in very low energy building

  14. Energy Model/LCA Conclusions Very solid model specifications Better contextualize our work – NREL, etc. Infiltration, R-value, and mass benefits of ICF should be considered separately Infiltration highly climate dependent; mass somewhat climate dependent Look at optimized use of mass – balance changes for low energy buildings CONCRETE SUSTAINABILITY HUB

  15. Work Through Aug 2011 • How do we optimize the mass benefits of concrete in single family houses? • 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 CONCRETE SUSTAINABILITY HUB

  16. Work Through Aug 2011 • Q1: How does mass shift the ‘PV Start Point”? • Christensen, et. al., 2004 CONCRETE SUSTAINABILITY HUB

  17. 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

  18. Alternate Slides

  19. 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

  20. Infil Rates Same R-values Different

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

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