yusen
December 8, 2023, 6:53am
1
Hello everyone
I have data on monitored Global Horizontal Irradiance, but no data on Direct Normal Irradiance and Diffuse Horizontal Irradiance. I would like to ask if I can perform the irradiance simulation based only on the monitored GHI data. Does ladybug have a GHI separation model to simulate DNI and DHI?
Thanks
Hi @yusen , gendaylit
has an option for -E
that should do what you need to generate the sky.
Usage: gendaylit month day hour [-y year] [...]
or: gendaylit -ang altitude azimuth [...]
followed by: -P epsilon delta [options]
or: [-W|-L|-G] direct_value diffuse_value [options]
or: -E global_irradiance [options]
Description:
-P epsilon delta (these are the Perez parameters)
-W direct-normal-irradiance diffuse-horizontal-irradiance (W/m^2)
-L direct-normal-illuminance diffuse-horizontal-illuminance (lux)
-G direct-horizontal-irradiance diffuse-horizontal-irradiance (W/m^2)
-E global-horizontal-irradiance (W/m^2)
Output specification with option:
-O [0|1|2] (0=output in W/m^2/sr visible, 1=output in W/m^2/sr solar, 2=output in candela/m^2), default is 0
gendaylit version 2.5 (2018/04/18)
I don’t think we have a component that exposes this option but you should be able to modify the existing one to use the -E
option.