Jim Lux James.P.Lux at
Thu Jul 18 17:21:28 PDT 2002

Generally, one would want to keep the RH above 30% or so, at which point 
the surface resistance of most materials is low enough to bleed off the 
static charge. (that's the guideline for the ESD controlled assembly areas 
here at JPL) One probably doesn't need to regulate the RH, per se, but just 
keep it in reasonable limits.

Bear in mind that the RH coming out of the chiller will be much different 
than the RH coming out of the hot side of your racks and in turn different 
than the RH in the room generally.

If you do humidify, you CAN use the bigger home type standalone 
humidifiers, but you'll be filling water tanks every day (or twice a day).. 
a permanently piped in one is much better.

The people who have to work in the machine room will also thank you for 
raising the RH a bit.

At 03:50 PM 7/18/2002 -0700, Andre Lehovich wrote:
>We just had the campus cooling guy visit to prepare a cost
>estimate.  He wanted to know if we want to regulate humidity
>along with temperature.  A humidifier helps avoid static
>electricity problems.  (We're in the desert, so even before
>A/C the relative humidity is low.)
>What are other cluster builders doing -- are you buying
>humidifiers along with the air-conditioners?
>Beowulf mailing list, Beowulf at
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