[Greenbuilding] solar mass

[Drew A. Gillett, P.E.]

not too critical, dark is good, diffuse is good.

given that the mass is only about moving a 50% solar fraction house to 75% 
and it does less than half of that ( the extra glazing beingwhat else is 
required) and that going from a light (reflectance of .5 ) to a dark ( of 
95) floor probably reduces solar fraction by about 2% points, it's not a 
big deal.  so no real need to have a black floor, but given your druthers, 
you'd rather have the mass surfaces be dark and directly exposed to the 
sunlight.

some more info at www.nmsea.org  passive solar fact sheet

extensive research at los alamos labs in the 70's 80's gave real numbers and 
correlations that are incorporated into doe2 and energy-10 and energyplus 
programs available at www.sbicouncil.org

the basic deal is once the energy enters the building thru the window it has 
a hard time getting out.   mass in the sun is about 6 times as effective as 
not in sun.  first few inches of mass count the most.  glossiness is a glare 
dust issue more than thermal. diffuse bounces evenly all the time gloss 
bounces in one direction, but the direction changes over time netting 
similar results..

more than this and i start the clock, drew gillett, p.e.

just get clear , black and insulated in the right order and you'll be close 
to nailing it.


----- Original Message ----- 
From: "Mark Marcoplos" <marcoplos at bellsouth.net>
To: <Greenbuilding at listserv.repp.org>
Sent: Tuesday, May 29, 2007 1:44 PM
Subject: [Greenbuilding] solar mass


> Anybody know how crucial the color of a slab is to its functionality as
> solar mass?
>
> How about the glossiness of the finish?
>
> Thanks,
> Mark Marcoplos
> Marcoplos Construction
> 919-968-0056
> http://www.MarcoplosConstruction.com
>
>
> _______________________________________________
> Greenbuilding email list
> List info: 
> http://listserv.repp.org/mailman/listinfo/greenbuilding_listserv.repp.org
> List email: Greenbuilding at listserv.repp.org
> Managed by BuildingGreen, Inc. http://www.buildinggreen.com
>      publisher of Environmental Building News and GreenSpec(r)
> Hosted and archived by REPP / CREST http://www.crest.org
>