For a publication I would like to shortly describe the climate data used for the thermal simulations. So I was thinking to provide heating degree days (HDD) and cooling degree days (CDD). However, I am unsure which is the correct algorithm to calculate those.
A typical formula that can be found basically says:
If the daily mean temperature is below a threshold temperature (T_threshold usually 12°C), sum up this day's temperature differences between mean (T_ext, mean) and indoor temperature (T_int, usually 20°C). For CDD it is the same but with a higher threshold temperature (T_threshold).
I'd love to provide a formula / image, but my Karma is too low :(
Is this a good formula to use or are there other (standardized or more accepted) ones around? Would you take a different (than degree days)? Thanks!