Hi,
I’m using the Ladybug’s component, “Ladybug solar temperature adjustor”.
I want to calculate the indoor thermal environment using UTCI.
There is “window transmissivity” item in the input list of the component, but how can I input window geometories?
I think I have to input it to define the indoor area facing to the glazing to calculate the indoor is comfortable or not.
In order to calculate comfort indoors you should rather use either Adaptive Comfort or PMV comfort recipes. UTCI is to be used for outdoor thermal comfort.
… and here’s an example for what @devang is talking about:
http://hydrashare.github.io/hydra/viewer?owner=chriswmackey&fork=hydra_2&id=Microclimate_Map_-_Simple&slide=0&scale=1&offset=0,0
Best practice for indoor simulations is to run an energy model and use the microclimate maps above. If you want a better understanding of all the operations that happen under the hood of the microclimate maps, this slow but informative example might also be useful:
http://hydrashare.github.io/hydra/viewer?owner=chriswmackey&fork=hydra_2&id=Deconstructed_Microclimate_Map&slide=0&scale=1&offset=0,0
Hi Chris,
Can you provide any more information on what the window transmissivity represents? I’m trying to understand so that I can adjust a SHGC value I’ve been provided to use as an accurate input.
Thanks!
Hi @SophieWeiner,
SHGC includes both transmitted and absorbed aspects of solar gain for the window. The transmissivity needs to just be the transmitted part of this (Tsol, transmittance solar). I believe that Lawrence Berkeley National Laboratory has an International Glazing Database which includes the Tsol for different glazing products.
This is quite a cool plot that shows Tsol against VLT for various glazing products using that database
https://public.tableau.com/app/profile/richardstokes88/viz/IGDBGlazingAnalysis/Dashboard
Cheers,
Charlie
Awesome! Such a great resource.
What