I was trying to get my head around for the 2-phase simulation method in HoneyBee+ for the annual daylight recipe and annual radiation recipe. After reading the DC simulation part of Daylighting Simulations with Radiance using Matrix-based Methods and some code in HoneyBee+, I have some understanding and also some questions that would like to get some comment and help if possible.
If I understand it correctly, the Annual Daylight Recipe and DC Grid Base Daylight Recipe are the same in current HoneyBee+. Both of them are 2 phase simulation, am I right?
The Annual Daylight Recipe is following the equation in the Daylighting Simulations with Radiance using Matrix-based Methods, which is
total daylight = Cdc*S - Cdcd*Sd + Cds*Ssun
If I could, I would like to translate the equation into daylight language for the following discussion:
Cdc as total scene, = black scene + reflect scene
S as total sky, = direct sky + diffuse sky
thus, Cdc*S = black scene * direct sky + reflect scene * direct sky + black scene * diffuse sky + reflect scene * diffuse sky
together with other parts of the equation, total daylight = black scene with sun only * sun + reflect scene * direct sky + black scene * diffuse sky + reflect scene * diffuse sky
The reason for all these calculation, is to replace the black scene * direct sky with black scene with sun only * sun, to improve accuracy. Please correct me if this is wrong.
For the annual radiation recipe, I see the equation is
total radiation = (black scene + reflect scene) * diffuse sky + black scene with sun only * sun
My understanding for this part is, different from illuminance, radiation is not reflected by other surfaces, so that the (reflect scene * direct sky) part should not be included.
Then my question here is, shall we use black scene for the diffuse sky instead of total scene to remove the (reflect scene * diffuse sky) part, as reflection is not contributing to radiation?
I hope I made myself clear and I appreciate your help in advance.