Annual Sky Radiation recipe for Pollination
This recipe calculate the annual sky radiation for each timestep provided in the wea file. Nigh-time hours are filtered before running the simulation. To match the results for each hours see the list of hours in sun-up-hours.txt.
This recipe uses Radiance's gendaymtx to generate the sky. "Gendaymtx takes a weather
tape as input and produces a matrix of sky patch values using the Perez all weather
model". "If there is a sun in the description, gendaymtx will include its contribution
in the four nearest sky patches, distributing energy according to centroid proximity".
This means that the value of direct sun is diffused between these patches. This
approximation is fine for studies such as cumulative radiation or for outdoor studies
where the amount of exact direct radiation is not critical. For accurate direct radiation
see annual_radiation recipe.