On 16/01/2024 at 10:50:13 PM, Saku Ytti <saku@ytti.fi> wrote:
On Tue, 16 Jan 2024 at 11:00, William Herrin <bill@herrin.us> wrote:
You have a computer room humidified to 40% and you inject cold air
below the dew point. The surfaces in the room will get wet.
I think humidity and condensation is well understood and indeed documented but by NEBS and vendors as verboten.
I am more interested in temperature changes when not condensating and causing water damage. Like we could theorise, some soldering will expand/contract too fast, breaking or various other types of scenarios one might guess without context, and indeed electronics often have to experience large temperature gradients and appear to survive. When you turn these things on, various parts rapidly heat from ambient to 80-90c. So I have some doubts if this is actually a problem you need to consider, in absence of condensation.
Here’s some manufacturer specs: https://www.dell.com/support/manuals/en-nz/poweredge-r6515/per6515_ts_pub/environmental-specifications?guid=guid-debd273c-0dc8-40d8-abbc-be059a0ce59c&lang=en-us 3rd section, “Maximum temperature gradient”.
From memory, the management cards alarm when the gradient is exceeded, too.
-- Nathan Ward