Average outdoor dry bulb temperature

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Hello,

I want to use the average outdoor dry bulb temperature in my Low Temp Radiant Constant Flow objects (concrete core heating and cooling), from the last 24, 48 or 72 hours.

Seems to me that only with an EMS this can be solved ?

Are there good examples somewhere, I have little experiance in EMS programming, apart from some small IDF script in Designbuilder, but I can imagine that I'm not the first one who wants to try this?

Best regards,

Geert