[Equest-users] Ceramic Insulating Paint Additives

[Bishop, Bill]

Federico,

I have no experience using ceramic paint additives. This document
provides some engineering background, and also concludes that, "the
benefit of this product over time on exterior walls... very likely may
be small.":

http://www.energy.wsu.edu/documents/AHT_Insuladd%5B1%5D.pdf%20Ceramic-ba
sed%20paint%20additive.pdf

You can, however, try modeling this in eQUEST. Using the values
discussed in the link, adjust both the absorptance and emissivity of the
walls. ABSORPTANCE - CONSTRUCTION is a property of the exterior wall
construction. OUTSIDE-EMISS - EXTERIOR WALL is under the Daylighting -
Shading - Other tab of each wall surface.

You will probably find that the energy impact is minimal, and therefore
not cost-justified. Appendix G only allows for different absorptance
(1-reflectance) for white/cool roofs, and does not address emissivity.
Therefore, I think you would have to submit a CIR with good supporting
documentation to justify using different absorptance and emissivity
values for the Proposed and Baseline exterior walls.

Regards,
Bill


-----Original Message-----
From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sami,
Vikram
Sent: Monday, August 08, 2011 9:56 PM
To: steinvor at msu.edu; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Ceramic Insulating Paint Additives

I'm pretty sure the ceramic additives do not really affect R-value. They
affect the emittance of the paint surface (low-e paints use this). As
far as I know you cannot account for surface emittance in eQUEST.

I'm not saying that it doesn't work or it doesn't have benefits -
however you need to be careful when you mix thermal metaphors. It may be
ok to assume an added R-value for this paint, but I doubt it. Its
probablye more effective in hot climates than in cool climates - but
additional R-value will have more effect in cold climates than in hotter
ones. (this is a guess - I haven't done any simulations to support
this).

Other simulation programs like E+ or IESVE might be able to simulate
emittance better, but I can't speak to that.

Good luck.

-Vikram

________________________________________
From: equest-users-bounces at lists.onebuilding.org
[equest-users-bounces at lists.onebuilding.org] On Behalf Of
steinvor at msu.edu [steinvor at msu.edu]
Sent: Monday, August 08, 2011 7:58 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Ceramic Insulating Paint Additives

Hello:

Has anyone tried a simulation with insulating ceramic paint additive?
How does USGBC think about this for LEED? How is the R value defined?
I appreciate any comment or suggestion about this.

Thanks!

Federico

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