I have ran a daylight autonomy simulation with Pollination/Honey bee for the first time. However, I found the result is much different from the IES Radiance output, which I can’t tell which are more valid.
I have attached my honey bee model, as well as the DA simulation receipt. I only include sensor grid for 1 room for easy comparision.
The simulation is tested for the Green Star Building V1 protocol, which requires more than 160lux of daylight for more than 80% of the nominated time (7:00-19:00 for this case). The reflectance value are set to default as Wall 0.7/Ceiling 0.8/Floor 0.3, and all external window have VLT of 0.64.
My GH results indicate only 20% of the floor area has achieved this criteria, while IES Radiance gives a generouse result of 50%. The geometry should be exactly the same, as I output the Pollination model to IES in GEM.
Are there anything else that can affect the result by that much? Is my model setup correct?
In your file you left the Radiance parameters to the default parameters. You can use the HB Radiance Parameter component to create a set of parameters for different detail levels (0, 1, 2), and add them to the recipe. The recipe type must be set to 2 for annual daylight. You can also type your own parameters in a panel if you have some specific parameters.
From past experience, I know that you can check and match your Radiance parameters between Pollination and IES. They might be using different default numbers for multiple parameters. We did a comparative study for DF, UDI and sDA with IES, Pollination and LB-HB Legacy. In a nutshell, the results were pretty much close to one another after making sure that we did enter the identical inputs with identical simulation settings.
