Brian,
not sure about scientific experimental data. However, I did see 100% RH
with water beads running on the table at >30degree C... if the table is not
covered with oil based paint, you might even grow few mushrooms on the table
legs... I did heard story about fugus grow on pwbs, preferably, laptops,
where the fan blow is minimum...and conformal coat (silicone based) are more
faverable for stuff to pop up...jk
abcd
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Brian Ellis
Sent: Thursday, June 01, 2006 10:02 AM
To: [log in to unmask]
Subject: [TN] Do we exaggerate?
I have discovered that there is a real limit to the conditions of
natural temperature and humidity that are possible. To put it simply, if
the temperature and humidity are high at ground level, clouds will form
at a given altitude, reflecting solar radiation. This will result in a
lowering of the temperature. I haven't yet determined the exact limit
conditions, but it would seem that (very roughly), you can obtain 100%
RH only if the temperature is under about 15°C. At 25°C, the max
humidity is ~85%. At 35°C, 75%. At 50°C, 55%.
When I have more exact data, it is clear I'll be able to determine a
limit curve, on the right side of which it will be impossible for
natural conditions to exist. However, we can create conditions in
climatic chambers which will be far to the right of the curve, and we
use such conditions in SIR/ECMR testing. Are we exaggerating when we
pump up the temperature and humidity to excessive levels, to create
conditions which can never occur in real life? Is there even a rationale
to do so? Remember that the inside of an enclosure with active
electronics is warmer than ambient. The real dangerous conditions are
with high humidities, which can occur only at artificially low
temperatures, such as when going into a tropical rain forest conditions
from an over-air-conditioned room (e.g., 20°C to 30°C/80% RH), when
condensation may occur for a short time.
Views are welcome, please.
Brian
--
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