Hi Julien,

> I would like to do free air cooling for some small
> datacenter. Idea is to use cold air from outside to cool
> the servers room in order to limit AC power when possible.

I like that idea getting rid / reducing the amount of chillers.

> I have sensors inside servers room and outdoor to collect
> temperature and humidity.
> I calculate both dew point and try to estimate thermal bridge
> value.

Perfect!

> Has anyone already worked on this can give me some clues?

Harald ([email protected]) from erecon did already something similar in 
the past to heat up it's office (during winter ;-) and cool down its servers. 
He has a nice and successful approach doing this. I met him on a datacenter 
event. 

cCheers Thomas



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