Tim,
You wrote:
>Isn't it true that every bit of electricity going into the computer
room
>will get turned to heat? It may do a little work moving some bits around
or
>lighting a pixel on a screen. But, even then it eventually gets turned
into
>heat.
That is not true. Some electricity does work, and some electrons return
via the cable.
If every electron you use would turn into heat, you should use the
famous Einstein's Formula E=mc2, and you have gott the best invention in
the world: mass to energy conversion outside a termonuclear artifact.
Hope this helps.
-- Andres j. Ogayar
-- I.T. Department
-- Raytheon Microelectronics Espaņa (Malaga, Spain)
-- +34.95.224.92.27
"Atwood, Tim
(DVM)" Para: [log in to unmask]
<Tim.Atwood@DO cc:
MTAR.COM> Asunto: Re: Environmental Questions of a
Enviado por: different nature
HP-3000
Systems
Discussion
<HP3000-L@RAVE
N.UTC.EDU>
27/07/2001
03:15
Por favor,
responda a
"Atwood, Tim
(DVM)"
My thinking may be a little simplistic on this one, but...
Isn't it true that every bit of electricity going into the computer room
will get turned to heat? It may do a little work moving some bits around or
lighting a pixel on a screen. But, even then it eventually gets turned into
heat.
So: Borrow an amp meter. Probably one of the ones with an external clamp on
probe (since I would not suggest pulling electrical panel wiring apart).
Turn on everything possible in the computer room. Maybe load the bigger
computers and drives with cycles or accesses, or at least pick your busiest
time of day. Measure the amps being pulled through the main computer room
panel.
(I am of course assuming the computer room has it's own panel? Most places
don't want the coffee maker outside the door throwing the breaker on the
computers...)
Now I don't have my old electronics and/or physics reference manuals in the
office with me. But I'm sure someone out there would be happy to supply the
calculation for converting amp hours to BTU's...
If I remember off the top of my head (and converting to you southerner's
weird F type degrees - hey I'm a Canuck) - Our temperature alarms are set
to
start notifying us at 78 and shut down the power at 90. I seem to remember
most HP3000's are rated at 95 for six hours? (Though this may be an old
memory from classic days).
However, I also know the last time our primary air conditioner failed we
had
two memory chips fail on HP3000's within a week. Now whether this was the
shock of the temperature or just random chance I don't know. I also do not
know what the temperature internal to the racks was. But outside it never
got to 90 since the power never shut off. I believe it was hovering around
85 for several hours before we got the primary AC working. (The backup AC
unit kept it down at least this low).
Timothy Atwood
Holtenwood Computing
http://www.holtenwood.bc.ca/computing/
for Domtar Vancouver Mill
(Opinions expressed are mine and do not reflect Domtar)
-----Original Message-----
From: Art Bahrs [mailto:[log in to unmask]]
Sent: Tuesday, July 24, 2001 8:00 AM
To: [log in to unmask]
Subject: [HP3000-L] Environmental Questions of a different nature
Hi All :)
Ok... anyone have a site that shows BTU's produced by individual HP
components, such as Hard drives, tape drives, CPU's, and Power Supplies?
I am evaluating our data center and it's environmental conditions... we
have a 928, 979-200 and a L2000 plus related drives, phone systems, DTC's,
other servers, consoles and such in there... I need to know if our
cooling
capacity is good to go or what???
Also, what is an acceptable operating environmental temperature for a
data center? What is the 'optimum' temp?
Thanks,
Art "Hey, at least it's on topic for once! hehe" Bahrs
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