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01-04-2009, 02:01 PM   #1
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## Btu's and watts

What's the correlation between Btu's and watts? Ex. 10,000 Btu's = ? watts

01-04-2009, 02:10 PM   #2
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Quote:
 Originally Posted by Steelhead What's the correlation between Btu's and watts? Ex. 10,000 Btu's = ? watts
BTU is a measure of energy, whereas watts is a measure of power. Power being the time rate consumption of energy. 1 BTU is about 1055 joules, and 1 watt is 1 joule per second. So 1 BTU is equivalent to the energy consumed by a 60 watt light bulb in about 18 seconds.

10,000 BTU = 2930.5 watt-hours

 01-04-2009, 03:09 PM #3 Member   Join Date: Dec 2008 Location: Southern Wisconsin Posts: 171 Rewards Points: 150 Thanks InPhase!

 01-04-2009, 04:16 PM #4 Member   Join Date: Jun 2008 Posts: 2,467 Rewards Points: 2,906 You can use this calculator to convert energy expressed as Joules, BTUs or Kilowatt hours into one of the other measurements, and then divide by time to determine the power expressed as horsepower, watts or BTU/hr. http://www.mhi-inc.com/Converter/watt_calculator.htm __________________ Bashing my head against the walls in some of the internet's finest chat rooms.
 01-04-2009, 04:25 PM #5 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 100w for 100 milliseconds is how many watt·hours?
 01-04-2009, 04:40 PM #6 I have gas!     Join Date: Mar 2007 Location: Massachusetts Posts: 1,975 Rewards Points: 1,374 1 watt = 3.4 BTUs. Don't forget to figure in the inefficiencies of the equipment. __________________ I tear things down and build them up.
01-04-2009, 04:50 PM   #7
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Quote:
 Originally Posted by Clutchcargo 1 watt = 3.4 BTUs. Don't forget to figure in the inefficiencies of the equipment.
3.4 BTU/hr maybe, not BTU. There is a difference.

 01-04-2009, 04:56 PM #8 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 Even with this http://www.onlineconversion.com/ it can still be confusing
01-04-2009, 05:01 PM   #9
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Quote:
 Originally Posted by Yoyizit 100w for 100 milliseconds is how many watt·hours?

0.000000011 horsepower-fortnights

 01-04-2009, 05:05 PM #10 Member   Join Date: Jul 2008 Location: NW of D.C. Posts: 5,990 Rewards Points: 2,000 Yeah, I get 1.108x[10^(-8)] but it should be reported as 1x[10^(-8)] or 1.11x[10^(-8)] since there is only one significant figure or three significant figures in 100w and 100 mS, we don't know. . . What are we turning into??? Last edited by Yoyizit; 01-04-2009 at 05:10 PM.
01-04-2009, 06:03 PM   #11
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Quote:
 Originally Posted by Yoyizit 100w for 100 milliseconds is how many watt·hours?
100*.001=.1 watt second
Convert to minutes divide by 60(60 seconds in minute)
convert to hours divide by 60 again(60 minutes in hour)
.1/60/60 = .00000277 watt-hour

01-04-2009, 06:23 PM   #12
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One of the more common conversions is
1 kWh = 3412 BTU/hour

With that simple conversion, you can compare the difference and efficiencies of electric vs gas vs oil, etc.

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