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AG
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 Posted: Fri Aug 08, 2003 4:58 am Post subject: BTUs of heat from computer |
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Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG |
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Big B
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| Posted: Fri Aug 08, 2003 5:54 am Post subject: Re: BTUs of heat from computer |
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I was just asked this question at work today.
We have 400 Dell Desktops in a small DR site. A little research at Dells
site showed that a low profile desktop with a 450 watt power supply was
rated at about 800 btus(nominal).
I'm not an engineer, but that's what a Dell Optiplex GX1 does.....
Hope this helps...
Chris
"AG" <atenor@email.com> wrote in message
news:3f32e78c$0$63821$4c5eba9e@news.newshosting.com...
| Quote: | Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
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Barry Watzman
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| Posted: Fri Aug 08, 2003 7:37 am Post subject: Re: BTUs of heat from computer |
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I don't know the conversion factor, but the power consumption (watts) of
the equipment will effecively give you the answer, do a google search on
"conversion factors", you are looking for watts to BTU/hour or something
like that.
AG wrote:
| Quote: | Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
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Nigel Kendrick
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| Posted: Fri Aug 08, 2003 12:39 pm Post subject: Re: BTUs of heat from computer |
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"AG" <atenor@email.com> wrote in message
news:3f32e78c$0$63821$4c5eba9e@news.newshosting.com...
| Quote: | Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
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Not trying to be a smartass but wouldn't you think the aircon guys could
help work this out? Otherwise, it's a bit like ordering a meal in a
restaurant and the kitchen staff coming out and asking you for cooking tips.
NK |
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AG
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| Posted: Fri Aug 08, 2003 7:11 pm Post subject: Re: BTUs of heat from computer |
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"Nigel Kendrick" <nkendrick@stiknowledge.dotcodot.uk> wrote in message
news:bgvk47$pe$1@newsg4.svr.pol.co.uk...
| Quote: |
"AG" <atenor@email.com> wrote in message
news:3f32e78c$0$63821$4c5eba9e@news.newshosting.com...
Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
Not trying to be a smartass but wouldn't you think the aircon guys could
help work this out? Otherwise, it's a bit like ordering a meal in a
restaurant and the kitchen staff coming out and asking you for cooking
tips.
NK
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While I agree with you I can't help the fact that the bulbs in this pack
aren't the most luminous around.
Our landlord is so cheap that he squeaks when he walks. Lets say it this
way, he is a doctor and yesterday he was out in 90 degree + weather painting
one of the buildings in the shopping center instead of hiring someone to do
it.
AG |
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AG
Guest
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| Posted: Fri Aug 08, 2003 7:11 pm Post subject: Re: BTUs of heat from computer |
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"Barry Watzman" <Watzman@neo.rr.com> wrote in message
news:3F330ACF.6000306@neo.rr.com...
| Quote: | I don't know the conversion factor, but the power consumption (watts) of
the equipment will effecively give you the answer, do a google search on
"conversion factors", you are looking for watts to BTU/hour or something
like that.
AG wrote:
Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
Sounds good, I'll try it. Thanks. |
AG |
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Sundog1966
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| Posted: Sat Aug 09, 2003 12:33 am Post subject: Re: BTUs of heat from computer |
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One I think you really need to be working in watt-hours for your
calculation or kilowatt-hours.
http://www.energy.iastate.edu/renewable/wind/wem/wem-18_apen_a.html
looking at the conversion factors here we can then proceed as follows:
given that:
Wattage of power supply = 400
Run Time = 1 Hour
Watt hours of power supply = 400 Watts * 1 Hour = 400 Watt Hours.
Convert to BTU using specific conversion factors from website
400 * .001 = .4 BTU = .4 BTU for a 400 watt power supply
Extending to 24 hours
400 Watts * 24 Hours = 9600 Watts = 9.6 kWH
Applying conversion factor from site
9.6 * 3.414 = 32.7744 BTU Per Day per PC
so the figure of 800 would probably be an annual figure
32.7744 * 365.25 = 11970.8496 BTU
You might want to enquire where and uder what conditions Dell is
liting thier BTU figures for.
For example if they are figuring on a use time of 4 hours per day for
260 days (52 weeks / year * 5 weekdays/week)
400 * 4 = 2400 Watts = 2.4 kWH
2.4 * 3.414 = 8.1936 BTU per day * 260 = 2130.336 BTU per Year
Comments from Engineers appreeciated.
On Thu, 7 Aug 2003 18:58:26 -0500, "AG" <atenor@email.com> wrote:
| Quote: | Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
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Sundog1966
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Sundog1966
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| Posted: Sat Aug 09, 2003 12:44 am Post subject: Re: BTUs of heat from computer |
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One other interesting site I ave jsut located:
http://www.upsite.com/TUIpages/whitepapers/tuiheat1.0.html
On Thu, 7 Aug 2003 18:58:26 -0500, "AG" <atenor@email.com> wrote:
| Quote: | Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
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Barry Watzman
Guest
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| Posted: Sat Aug 09, 2003 4:33 am Post subject: Re: BTUs of heat from computer |
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No, I think that you blew it.
According to your own reference, watts x 3.413 = BTU/hr
400 x 3.413 = 1,365 BTU/hr, which I think is the correct answer being
sought.
One other note: A "400 watt" PC power supply is CAPABLE of producing
400 watts of OUTPUT power.
But, on the one hand, it's probably not running at maximum capacity,
perhaps closer to half maximum.
On the other hand, the relevant number for conversion to BTU is not the
output of the power supply, but the INPUT, e.g. the amount of power
consumed from the wall socket. Power supplies are not 100% efficient,
70% to 85% is probably more like it. The only way to get an exact
answer would be to actually measure the power being drawn, which is not
particularly easy to do.
Sundog1966 wrote:
| Quote: | One I think you really need to be working in watt-hours for your
calculation or kilowatt-hours.
http://www.energy.iastate.edu/renewable/wind/wem/wem-18_apen_a.html
looking at the conversion factors here we can then proceed as follows:
given that:
Wattage of power supply = 400
Run Time = 1 Hour
Watt hours of power supply = 400 Watts * 1 Hour = 400 Watt Hours.
Convert to BTU using specific conversion factors from website
400 * .001 = .4 BTU = .4 BTU for a 400 watt power supply
Extending to 24 hours
400 Watts * 24 Hours = 9600 Watts = 9.6 kWH
Applying conversion factor from site
9.6 * 3.414 = 32.7744 BTU Per Day per PC
so the figure of 800 would probably be an annual figure
32.7744 * 365.25 = 11970.8496 BTU
You might want to enquire where and uder what conditions Dell is
liting thier BTU figures for.
For example if they are figuring on a use time of 4 hours per day for
260 days (52 weeks / year * 5 weekdays/week)
400 * 4 = 2400 Watts = 2.4 kWH
2.4 * 3.414 = 8.1936 BTU per day * 260 = 2130.336 BTU per Year
Comments from Engineers appreeciated.
On Thu, 7 Aug 2003 18:58:26 -0500, "AG" <atenor@email.com> wrote:
Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
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Sundog1966
Guest
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| Posted: Sat Aug 09, 2003 6:58 am Post subject: Re: BTUs of heat from computer |
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On Fri, 08 Aug 2003 23:33:17 GMT, Barry Watzman <Watzman@neo.rr.com>
wrote:
| Quote: | No, I think that you blew it.
According to your own reference, watts x 3.413 = BTU/hr
400 x 3.413 = 1,365 BTU/hr, which I think is the correct answer being
sought.
I actually meant to indicate that this line would convert to kilowat |
hours (the .001 factor).and proceed with calculations from there since
most electricity consumption is billed in kWh. Remaining
calculations should be scaled to reflect as well 3.414 should be 3414
etc.. This is what I get for starting in watts then deciding to work
in kWh instead. oops.
| Quote: | One other note: A "400 watt" PC power supply is CAPABLE of producing
400 watts of OUTPUT power.
But, on the one hand, it's probably not running at maximum capacity,
perhaps closer to half maximum.
On the other hand, the relevant number for conversion to BTU is not the
output of the power supply, but the INPUT, e.g. the amount of power
consumed from the wall socket. Power supplies are not 100% efficient,
70% to 85% is probably more like it. The only way to get an exact
answer would be to actually measure the power being drawn, which is not
particularly easy to do.
Ahh some good numbers on power supply effiency!
Sundog1966 wrote:
One I think you really need to be working in watt-hours for your
calculation or kilowatt-hours.
http://www.energy.iastate.edu/renewable/wind/wem/wem-18_apen_a.html
looking at the conversion factors here we can then proceed as follows:
given that:
Wattage of power supply = 400
Run Time = 1 Hour
Watt hours of power supply = 400 Watts * 1 Hour = 400 Watt Hours.
Convert to BTU using specific conversion factors from website
400 * .001 = .4 BTU = .4 BTU for a 400 watt power supply
Extending to 24 hours
400 Watts * 24 Hours = 9600 Watts = 9.6 kWH
Applying conversion factor from site
9.6 * 3.414 = 32.7744 BTU Per Day per PC
so the figure of 800 would probably be an annual figure
32.7744 * 365.25 = 11970.8496 BTU
You might want to enquire where and uder what conditions Dell is
liting thier BTU figures for.
For example if they are figuring on a use time of 4 hours per day for
260 days (52 weeks / year * 5 weekdays/week)
400 * 4 = 2400 Watts = 2.4 kWH
2.4 * 3.414 = 8.1936 BTU per day * 260 = 2130.336 BTU per Year
Comments from Engineers appreeciated.
On Thu, 7 Aug 2003 18:58:26 -0500, "AG" <atenor@email.com> wrote:
Anybody got any idea how many BTUs of heat are give of by a computer?
The air-conditioning guy wants to know what we need in the server room.
AG
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Nigel Kendrick
Guest
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| Posted: Sat Aug 09, 2003 1:09 pm Post subject: Re: BTUs of heat from computer |
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| Quote: | While I agree with you I can't help the fact that the bulbs in this pack
aren't the most luminous around.
Our landlord is so cheap that he squeaks when he walks. Lets say it this
way, he is a doctor and yesterday he was out in 90 degree + weather
painting
one of the buildings in the shopping center instead of hiring someone to
do
it.
AG
Ah - I see! |
NK |
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Nigel Kendrick
Guest
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Wblane
Guest
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| Posted: Fri Aug 15, 2003 10:11 pm Post subject: Re: BTUs of heat from computer |
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They have amneters that can measure current flow based without breaking the
line. They work off inductance and the changing B-field produced by an AC
signal. Once you've got the amps drawn and you know the line voltage it's
trivial to figure out the power consumed.
| Quote: | 70% to 85% is probably more like it. The only way to get an exact
answer would be to actually measure the power being drawn, which is not
particularly easy to do.
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-Bill (remove "botizer" to reply via email) |
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Barry Watzman
Guest
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| Posted: Sun Aug 17, 2003 4:36 am Post subject: Re: BTUs of heat from computer |
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Agreed, and I knew that, but most people don't have access to them,
although most electricians have them.
Wblane wrote:
| Quote: | They have amneters that can measure current flow based without breaking the
line. They work off inductance and the changing B-field produced by an AC
signal. Once you've got the amps drawn and you know the line voltage it's
trivial to figure out the power consumed.
70% to 85% is probably more like it. The only way to get an exact
answer would be to actually measure the power being drawn, which is not
particularly easy to do.
-Bill (remove "botizer" to reply via email) |
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