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    Is measuring LUX in a model possible?

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    • charly2008C Offline
      charly2008
      last edited by

      Hi,

      I have a question about IES Lights. On the Internet there are many catalogs with IES Lights. Is there a possibility to use it in Sketchup and Kerkythea? I've only used the KT-Lights in the plugin folder.

      Karlheinz

      He who makes no mistakes, makes nothing

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      • thomthomT Offline
        thomthom
        last edited by

        Moved the thread to the Developer's forum. We have reorganized so that the Plugin section is only a list of plugins you can download and use. 🤓

        Thomas Thomassen — SketchUp Monkey & Coding addict
        List of my plugins and link to the CookieWare fund

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        • M Offline
          minguinhirigue
          last edited by

          I am quite impressed seeing how lightup have improve since the first time I use it...

          I guess I should try it again, but metropolis render give me very good results in Kerkythea and podium.

          Adam, is it possible to extract some insulation numerical values (eg : on a desk) after the calculation ? I would like to use it in a lighting optimization script.

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          • AdamBA Offline
            AdamB
            last edited by

            @minguinhirigue said:

            Adam, is it possible to extract some insulation numerical values (eg : on a desk) after the calculation ? I would like to use it in a lighting optimization script.

            Yes, in that you can call the LightUp functions from Ruby to generate "spot" results at locations you choose. ( view.spotlux(x,y)) but really we should have a proper report generating framework.

            What kind of information / format are you looking for?

            Adam

            Developer of LightUp Click for website

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            • wind-borneW Offline
              wind-borne
              last edited by

              Just downloaded LightUp , question about Lux.

              Does the default extinction(0.5) give proper insolation values for daily sunlight output?

              "To read between the lines was easier than to follow the text."OSX 10.11.6

              %(#BF80BF)[SU 8 pro

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              • AdamBA Offline
                AdamB
                last edited by

                Short answer: Yes, within the limits of the insolation model used. Essentially the interaction in the atmosphere are so complex that researchers have produced numerous models that try and capture essence of the issue without going nuts. Its a surprisingly tricky subject.

                Long answer: LightUp insolation calculations use the Kasten & Young variable airmass model based on a nominal 1366 Joule/sec. In reality the amount of absorption due to the atmosphere varies with the cloud cover / haze which is represented in by a "coefficient of extinction". 0.1 would be a super clear non-hazy day. 0.8 would be overcast day. 0.5 represents some middle ground representing absorption and reflection in the atmosphere as the sunlight passes through to the ground.

                LightUp takes account of geo-location in determining daily insolation and the Kasten & Young model does a good job at modelling the curvature of the Earth and thus sunlight passing through a larger "slice" of atmosphere. And of course LightUp itself occludes the sunlight using your model over a 24 hour period. Together these give a good estimation of available energy on a surface - significantly better than the very broad rules of thumb you'll find in many solar energy modelling packages.

                So the Extinction coefficient is something that needs tweaking to reflect the general expected weather for your location, but it is more a fine adjustment. The general picture you'll get with leaving it 0.5 should be fine.

                Adam

                Developer of LightUp Click for website

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                • wind-borneW Offline
                  wind-borne
                  last edited by

                  Thanks for explanation, I had tried 0 and 1 and realized I didn't understand.
                  Out here in the middle of the ocean in the tropics 0.35 aligned with insolation charts (5.6KWh/m sq./day) for Feb., facing South/latitude tilt.
                  real world translation for power produced by the panel under cursor on Thurs.
                  Island has many microclimates and we have well over a thousand microinverters installed at about 50 locations islandwide, most of which I made quick preview models of. So I do have data to tweak. 😉

                  Thanks, again


                  LittleSnapper.png


                  Enlighten Microinverter.png

                  "To read between the lines was easier than to follow the text."OSX 10.11.6

                  %(#BF80BF)[SU 8 pro

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                  • AdamBA Offline
                    AdamB
                    last edited by

                    Cool.

                    At the risk of stating the obvious, the energy falling on a surface (available energy) will be much larger than what you can actually produce - as is born out by the measurements you show.

                    Developer of LightUp Click for website

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                    • D Offline
                      driven
                      last edited by

                      @wind-borne said:

                      Thurs. Island

                      There's a coincident, my brother in-law is a Torres Straight Islander.

                      but I live in England and was looking into how I might calculate solar power generation potential for a friends new house..

                      any tips for a complete 'solar' novice.

                      as you know I'm on a Mac, and will be trying out LightUp 1.8 imminently, so that may be a good time to investigate this as well.

                      john

                      learn from the mistakes of others, you may not live long enough to make them all yourself...

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                      • wind-borneW Offline
                        wind-borne
                        last edited by

                        @wind-borne said:

                        Thurs. Island

                        Actually those words are in different sentences 😳 😆
                        Thursday referring to the day.
                        I live on Maui,HI.

                        I just downloaded Fri.
                        Initially, I will be looking at Lux for estimates of losses due to shading as program does face calculation if I understand the static reading. Guessing the height and width of palm trees to place in model mixed with solarpathfinder readings will be pretty hypothetical and intensely visual 😎 yet possibly useful.

                        PM would be better concerning your question.

                        "To read between the lines was easier than to follow the text."OSX 10.11.6

                        %(#BF80BF)[SU 8 pro

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                        • AdamBA Offline
                          AdamB
                          last edited by

                          @wind-borne said:

                          Initially, I will be looking at Lux for estimates of losses due to shading as program does face calculation if I understand the static reading.

                          LightUp Insolation rendering gives 3 readings:

                          1. A spot Kwh/m^2/day for the exact position from which you're taking the reading.
                          2. (Static) A Face reading of Kwh/day (ie scaled by the area of the face). This is useful if you model panels with a single face.
                          3. (Tracked) A Face reading of Kwh/day assuming the face tracks the sun (and is therefore more efficient).

                          Adam

                          Developer of LightUp Click for website

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