Aerogel for Thermal Insulation of Interior Wall Retrofits in Cold Climates presentation at the best3 Conference
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- Bu səhifədəki naviqasiya:
- Aerogels have extreme properties
- Extreme properties many applications!
- Aerogels for building applications
- Aerogel synthesis is a three step process
- Approaches to reduce aerogel production cost
- Building retrofit applications
- Aerogel blanket application on the interior surface of the wall
- Target R-4 and R-8 with aerogel application on interior wall
| © Fraunhofer USA Aerogel for Thermal Insulation of Interior Wall Retrofits in Cold Climates Dr. Nitin Shukla, Dr. Ali Fallahi and Dr. Jan Kosny Fraunhofer Center for Sustainable Energy Systems Cambridge, MA 02141
Steve Harasim and Chris Blair Aspen Aerogels Inc. Northborough, MA 01532
April 04, 2012 © Fraunhofer USA Aerogels have extreme properties High porosity (80–99.8%) Low density ( ∼0.003 g/cm 3 ) High specific surface area (500–200m 2 /g)
Ultra-low thermal conductivity (0.02 W/m-K) Ultra-low dielectric constant (k = 1.0–2.0) Ultra-low index of refraction (n~1.05)
http://p25ext.lanl.gov/~hubert/aerogel/ http://www.aerogem.com/aerogel-photos-12.html © Fraunhofer USA Extreme properties many applications! 3 http://www.aerogel.com/products/pdf/Spaceloft_DS.pdf , http://fullers- blog.blogspot.com/ , http://berkeley.edu/news/media/releases/2006/01/10_dust.shtml , http://www.audax- speaker.de , http://www.cdiweb.com/ewave/422 , http://www.physorg.com/news/2011-03-advanced-carbon-aerogels-energy-applications.html
© Fraunhofer USA Aerogels for building applications Ultra low thermal conductivity (0.02 W/m−K) Light weight Fire resistant Water repellent Non-toxic R~10 compared to the commonly used thermal insulation materials such as XPS (R=5), EPS (R=4), PIC (R=6.5), and PU (R=6).
Aerogels are expensive due to low production volume.
http://stardust.jpl.nasa.gov/tech/aerogel.html © Fraunhofer USA Aerogel synthesis is a three step process Cost ~$1/cm 3 very expensive!! Sol-gel process TMOS, TEOS, PEDS, MTES, silicon alkaoxide Gel Ageing EtOH, TEOS, H2O batch process Gel Drying supercritical drying
Aerogel reinforcing fiberglass, carbon fiber, cross-linking with polymers
Time intensive, solvent evaporation High capital and energy costs Undesired increase in thermal conductivity and density © Fraunhofer USA Sol-gel process cheaper and more abundant alternatives such as rice husk, clay and OSA
low vapor pressure liquid continuous process Gel Drying atmospheric pressure drying freeze drying Aerogel reinforcing mechanically weaker yet cheaper and low conductivity alternatives, such as organic and biological fibers using less fiber content IR opacifiers, such as carbon black, titanium oxide to reduce radiative component
© Fraunhofer USA Interior wall application Space is premium Easy and quick on site installation
http://www.aerogel.com/markets/building.html Exterior wall application Energy efficiency improvements without any reduction in living space Maintains building exterior appearance Easy and quick on site installation
© Fraunhofer USA [1]
According to RS MEANS Building Construction Cost Data 2011. [2]
Includes interior trim and casing and estimated based on RS MEANS Building Residential Cost Data 2011. [3]
According to RS MEANS Building Construction Cost Data 2011; the cheapest combination of rigid board insulation thickness was assumed for the cost analysis (e.g. 9” was assumed as 3 x 3” layer instead of 4 x 2” + 1”). For PU, the thermal bridging effect was taken into account while calculating the required thickness to achieve target R-value. This cost is composed of material and labor costs. The labor cost varies from $0.43/ft 2 to $0.47/ ft 2 depending on insulation type. [4] According to RS MEANS Building Residential Cost Data 2011. [5] According to http://ths.gardenweb.com/forums/load/hvac/msg0219104426118.html . [6] According to RS MEANS Building Residential Cost Data 2011, the cost per sq foot of living area of baseline house is $80.25. [7]
This cost is composed of $2.75/ ft 2 material cost and $0.51/ ft 2 labor cost. Labor cost assumed the same as 1" rigid foam board installation cost from RS MEANS Building Construction Cost Data 2011. [8]
3 1/2" thick and R-13, according to RS MEANS Building Construction Cost Data 2011. [9]
After conversation with aerogel manufacturers and reviewing cost data, we assumed that in the
short term prognosis, a cost of R-4/10mm blanket can be chosen at $2.75/ft 2 .
© Fraunhofer USA Target R-4 and R-8 with aerogel application on interior wall © Fraunhofer USA Target R-12 with aerogel application on interior and exterior wall © Fraunhofer USA Conclusions Aerogel production cost can be reduced by using cheaper and more abundant raw materials such as rice husk, clay, OSA etc Continuous batch processing and APD may be considered for further cost reduction Cost associated with the aerogel application in residential retrofit projects is estimated and compared to the conventional building insulations method Aerogel method is cost competitive for a target insulation of R-4 for both the interior and the exterior installation cases R-8 interior insulation is within the range of current conventional insulations prices
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