[bldg-sim] Solar shading, fritted glass / louvre shading comparison

[Mona Fanni]

Dear
  I beleive that the thermal properties such as U-
value, solar transmittance , emmittance and
absorptance and the shading coefficient is dfferent
for both frit glass and the louvers , it is nessacery
to read the industry company' technical brochaure and
calculate the solar heat gain by the thermal
properties values given by it with the help of ASHRRAE
handbook of fundamentals Chapter" Fenestration".

Dr. Mona Ahmed Fanny
Researcher in the Building Physics dep.
Building Research Center, 87 Tahreer street, P.O.Box
1770, Dokki, Cairo, Egypt.
Fax: 202 3351564
Tel 202 3356853-3356722

--- Christian Struck
<Christian.Struck at BuroHappold.com> wrote:
> Dear all,
> 
> I have been working on a few projects were we had to
> deal with excessive
> solar gains due to huge areas of facade glazing.
> Even so we produced results comparing louvre shading
> against fritted glass
> indicating louvres perform significantly better than
> frit the architects
> came up with arguments picked up somewhere, that
> fritted facade glazing
> performs similar to louvres, with respect to solar
> gains. The point is, the
> facade glazing was requested to be modelled with a
> percentage frit above
> 70%.  Still we found the total solar gains to be
> more than double as high
> for the fritted glass compared to the louvre shading
> option.
> 
> Do you guys know by any chance a few papers or
> articles I could refer to, to
> either prove or review my models?! Any of you
> experienced similar problems
> in the past?
> 
> Many thanks for your effort in advance!
> 
> Christian
> 
>
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