I don’t understand this, is a EPW file and aggregate/combinations of multiple years? And if so, then how accurate is it?
lb_model_year.gh (19.6 KB)
I was expecting that a downloaded EPW would contain data from multiple years, and I can extract it by year to get an historic overview. Or am I missing something?
Hi @crz_06
The EPW file represents a typical meteorological year (TMY), put together with data of different years.
This is done to have a better overall estimation of how the building is going to perform.
If you want to use actual meteorological years (AMY) you can generate them with the dragonfly plugin “DF create EPW”.
Sometimes for comparing real energy use or comfort questions this can be usefull.
Ah, I see. Is there like an equivalent of EPW Map to download such files for a specific year?
this NOAA import seems interesting
Hi @crz_06,
You can look on this forum. There is a lot of information on this subject. For exemple here:
Hi,
I have over 20 years of hourly weather data from a weather station, and I’d like to use it to generate a Typical Meteorological Year (TMY) file. Is it possible to do this using Ladybug Tools?
Thanks
Hi @Julioamodia89 - I don’t know if Ladybug Tools has this feature but fyi, the method for generating a TMY file is described here:
This is the method we use to generate TMY files at Oikolab.
In theory simple, in practice a bit more difficult.
Furthermore, measured data is typically missing some values. Either in a series, or more often some of the required parameters are missing.
So generally it is better to aquire files from oikolab, shinyweatherdata, epw maps, or something similar.
Yours,
LittleBuddha
