[Bldg-sim] measurement of SHGC in the field

[D. Charlie Curcija]

At LBNL, in collaboration with University Federal Santa Catarina (UFSC),
Brazil, we have designed partable window energy meter that measures SHGC in
the filed. The instrument is not yet commercialized, but two companies are
exploring commercialization (D&S and EPDT). In a mean time, UFSC can
manufacture unit for you. I can supply you with contact information if you
are interested. Also, attached link to US DOE newsletter about the
instrument:
https://energy.gov/eere/articles/us-brazil-collaboration-leads-innovative-device-reduces-energy-use-buildings
.

Charlie

On Fri, Nov 10, 2017 at 10:07 AM, Nathan Brown via Bldg-sim <
bldg-sim at lists.onebuilding.org> wrote:

> Hi Chris —
>
> That instrument won’t do it, because it is not sensitive to infrared. More
> than half of irradiance is in the near IR (aka solar infrared). You need a
> pyranometer (LiCor is our go-to
> <https://www.licor.com/env/products/light/pyranometer.html>, or an Eppley
> <http://www.eppleylab.com/instrument-list/standard-precision-pyranometer/> for
> critical measurements, although that is probably overkill for this). I
> would measure vertical irradiance just inside and just outside the glass
> under direct sunlight. Here in the Bay Area, there is a tool lending
> library that will loan a pyranometer. Perhaps you can find a similar source
> closer to you.
>
> Best,
> Nathan
>
> Nathan Brown, BEMP, LEED AP ~ Associate
> LOISOS + UBBELOHDE
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>
> On Nov 10, 2017, at 3:08 AM, Chris Yates via Bldg-sim <
> bldg-sim at lists.onebuilding.org> wrote:
>
> Dear all
>
> We are trying to get a reasonable estimate for SHGC in the field.
>
> Our project is a retrofit of a relatively recent build that has
> overheating problems. No records exist of the original glazing spec.
>
> The glazing has a slight green tint; i.e. the "look and feel" of a fairly
> modern spectrally selective product with g-value (sorry SHGC) of about 0.4.
> However, a team member has now produced some records indicating this is
> significantly higher (more like 0.6).
>
> Does anybody have any experience or know of any research relating to this?
>
> *I was thinking of something like this, taking measurements on the
> horizontal and vertical plane inside and out:
> https://www.uv-light.co.uk/meters/irradiance-and-exposure/
> <https://www.uv-light.co.uk/meters/irradiance-and-exposure/>*
>
> Our saint gobain rep tells me their spectrographic equipment is 50,000 GBP
> - a bit out of our price range! (They've offered to test a sample for us!).
>
> Cheers
>
> Chris
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-- 

*--------------------------------------------------------------------------*

*D. Charlie Curcija**, Ph.D. **                    Tel: (510) 495-2602*

*Lawrence Berkeley National Laboratory         Fax: (510) 486-4089*

*Windows & Envelope Materials Group            Cell:(510) 604-8668*

*1 Cyclotron Rd., MS 90-3111                   Email: dccurcija at lbl.gov
<dccurcija at lbl.gov>*

*Berkeley, CA 94720                            Web: http://windows.lbl.gov/
<http://btech.lbl.gov/>*

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