[Bldg-sim] measurement of SHGC in the field

[Chris Yates]

Hi Nathan

Does the li-cor measure short enough wavelengths? I thought a lot of the uv
was < 400nm. I guess that most "selective coatings" have quite a big
crossover to the visible range in their reflectivity - hence the slight
green or blue hues. So, I can imagine that missing some of the uv-b isn't
too big a deal.

Both responses are super interesting. Thank you very much!

Chris

On Fri, Nov 10, 2017 at 6:54 PM, D. Charlie Curcija <dccurcija at lbl.gov>
wrote:

> 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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>> Alameda,CA 94501 USA
>> - - - - - - - - - - - - - - - - - - - - - - - - - - -
>> 510 521 3800 <(510)%20521-3800> VOICE
>> 510 521 3820 <(510)%20521-3820> FAX
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>> www.coolshadow.com
>>
>> 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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>
>
> --
>
>
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> *D. Charlie Curcija**, Ph.D. **                    Tel: (510) 495-2602
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> *Lawrence Berkeley National Laboratory         Fax: (510) 486-4089
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