Hi.
Am hacking a PV calculation based on the results from an annual irradiance simulation. And would like to include variable albedo for the ground.
What is the status of dynamic shading with regard to this?`
I saw in Here that there is a work around for annual daylight.
Is there something similar available for annual irradiance?`
Hi @LittleBuddha,
The annual-irradiance recipe does not support dynamic shading. For now you have to run the recipe for each ground condition.
Hi Mikkel.
Thanks for the rapid response.
Will do that, and combine afterwards.
Is there a plan for getting it to work with the annualirradiance?
If so, you can write me up as a tester.
Hi @LittleBuddha,
I would not say there is a concrete plan. Of course it would be nice to have but it is not a priority right now.
I’ll just hijack this post as i also want to include variable Albedo in my simulation.
It’s already possible for me to use the Annual Irradiance Recipe with an arbitrary timeframe. Now i just need to change the albedo correctly, is there a good practice for that when using honeybee in python? Currently i just used a big rectangular face as ground, for which i use plastic as material with the albedo as rgb_reflectance.
But i also saw there is the ground module in honeybee_radiance.lightsource, which probably ist the better way, i am just struggling where to implement that in the Annual Irradiance recipe.
Does someone have a hint/idea how to best change the albedo in the Annual Irradiance recipe?
Thanks in advance
Hi @Yannick,
I would use your first approach with the face as a ground surface. It is good practice to include the ground plane as geometry in your Radiance simulations.
Hi @mikkel,
thanks for the reply. I now used a surface as ground, but i have a strange behaviour for an albedo bigger than 0.8. I know it is not a realistic albedo at all, but i just want to make sure the general approach of albedo modelling is correct.
So i did a test where i used albedos variying from 0.1 - 1 with steps of 0.1 and measured the Irradiance on a Face using the Annual Irradiance Recipe (see picture). Till 0.8 the measured irradiance increases with higher albedo, as expected. But at over 0.8 the Irradiance drops again to the same value as for an albedo of 0.1.
At the moment i assume the ground to be fully diffuse and not rough (specularity and roughness = 0).
Do you have an idea where the behavior for high albedo is coming from?
