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August 21st, 2018, 06:59 AM   #1
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Unit Conversion BTU/Hr to KW

Hi,

This looks like an energy question, but it is really a math question. Does anyone have any idea why BTU/Hr is converted to KW, instead of KW/Hr (kWh)?

To me, that is like converting Miles Per Hour to Feet. It can't be done. You could convert Miles Per Hour to Feet Per hour.

All the conversion calculators online either convert BTU/Hr to KW, or they convert kWh (KW/HR) to BTU.

Perplexing.

Thanks

Last edited by skipjack; August 21st, 2018 at 07:39 AM.
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August 21st, 2018, 07:43 AM   #2
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The Watt is a unit of power (Joules per second), whereas the BTU is a unit of energy (as is the Joule, for example). Google gives 1 BTU = 1055.05585 Joules.

Note that kWh means kilowatt hour, not kilowatt per hour.
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August 21st, 2018, 08:05 AM   #3
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Thank you for your answer. I am not sure why I am in Physics Forum and I apologize if I posted to wrong forum. None the less, your answer is perfect. I thought a killowatt hour was the same as killowatts / hour and I appreciate you pointing out that there is a difference. Now I just have to wrap my brain around what the difference is.

A KW is a unit of one Killowatt. Is a kWh a different unit or is it the same unit over time?

Thank you.

Last edited by skipjack; August 21st, 2018 at 05:24 PM.
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August 21st, 2018, 08:17 AM   #4
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I am reading this great article that I think might help me. It explains that kW is a power measurement and kWH is an energy measurment. It continues on to explain power versus energy as well. The article is here. https://www.energylens.com/articles/kw-and-kwh

In short, you have put me on the right track by pointing out that kwh is not kw/hr.

Thanks again.

Last edited by skipjack; August 21st, 2018 at 05:25 PM.
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August 21st, 2018, 05:33 PM   #5
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I moved the question to the Physics forum, as physics is about measuring things. Avoid arbitrary capitalization - your "HR" should be "hr", it should be "W" rather than "w", etc.
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August 21st, 2018, 06:17 PM   #6
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Just because my background is actually Physics:

Kilowatt, the "W" is capitalized. So "kW" would be correct. Similar to why a Newton uses a capital "N" for forces, it's to honor the name of the scientist. In this case "James Watt".

Also, hours, we normally write "h" and not "hr" for hour. However, technically either is acceptable. We do tend to write "hrs" for hours to avoid prefix confusion if we were to write "hs".

Besides that, it looks like everyone has addressed the confusion regarding energy and power. Power is energy over time.

Hope that helps!
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