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BTU/KWH

04/13/2018 4:10 PM

HI CR4

i want to know that what is the guarantee that 1MMBTU can produced 293kW in case of Natural gas

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#1

Re: BTU/KWH

04/13/2018 4:29 PM

Two concept problems with this post:

  1. A <...guarantee...> is a commercial assurance that a certain quality will be achieved by a purchased product. Therefore this question needs to be asked of the enterprise that is selling the <...Natural gas...>, and not of CR4 contributors, if a meaningful commercial answer is required. The forum in itself does not issue guarantees as there is no commercial consideration here and the site, its operators and contributors are indemnified by the terms of use, which contributors acknowledge by using it.
  2. The other problem with this post is that <...MMBTU...> and <...kW...> cannot be converted meaningfully without introducing time; the first is a quantity and the second is a rate of quantity.

If <...kW...> is actually a typing mistake for kWh, then the conversion factor between them can be looked up freely in any number of published sources, and the concept of a <...guarantee...> in the matter is inapplicable.

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#2
In reply to #1

Re: BTU/KWH

04/13/2018 4:35 PM

thanks pwslack,

Sir , then what will effect the kW production in terms of increasing or decrees from 1MMBTU,

i searched the internet google easily convert 1mmbtu in 293kW ?

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#3
In reply to #2

Re: BTU/KWH

04/13/2018 4:43 PM

Although #1⇑ has evidently been read it clearly hasn't been understood. The question in #2⇑ is merely a re-worded repeat of the enquiry in the original post, and remains both problematic and unanswerable because of the understanding problem.

  • Please contact the supplier of the <...Natural gas...> directly, preferably by telephone in the first instance, to pursue commercial matters.
  • Please use an Engineering textbook for conversion factors between units.

<unsubscribes>

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#4

Re: BTU/KWH

04/13/2018 4:52 PM

None; the given units are incompatible.

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#5
In reply to #4

Re: BTU/KWH

04/13/2018 4:53 PM

so, sir , is there any way for calculating possible Kwh from 1mmbtu , i need just guide line

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#6
In reply to #5

Re: BTU/KWH

04/13/2018 4:58 PM

Try this.

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#7
In reply to #6

Re: BTU/KWH

04/13/2018 5:05 PM

what i found

The kilowatt hours unit number 293.07 kWh converts to 1 mmBTU, one one-million British Thermal Unit. It is the EQUAL energy value of 1 one-million British Thermal

but no one accepting it that 1mmbtu = 293.07kwh in cr4

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#8
In reply to #7

Re: BTU/KWH

04/13/2018 5:15 PM

Yes 1 million Btu's = 293.07 kWh = 1.05505585e9 joules

1 kWh = 3412 Btu.

https://www.rapidtables.com/convert/energy/BTU_to_kWh.html

These are energy equivalent conversions....if the conversion efficiency was 100%, which of course it rarely is, there is usually some energy loss in conversion...

https://www.eia.gov/tools/faqs/faq.php?id=107&t=3

https://en.wikipedia.org/wiki/Heat_rate_(efficiency)

Natural gas electrical generation av heat rate is around 7870...so that would give you about a 50% efficiency...

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#10
In reply to #5

Re: BTU/KWH

04/13/2018 9:00 PM

Yes, but kWh is different from kW. Several others have given the conversion factor, but there may be efficiency losses. Input of 1MMBtu will give a total output, some of which may be mechanical energy and some may be heat. If the hest is not useful, then it will be an efficiency loss.

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#9

Re: BTU/KWH

04/13/2018 5:50 PM
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#11

Re: BTU/KWH

04/13/2018 10:47 PM

Ask your supplier for enlightenment.

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#12

Re: BTU/KWH

04/14/2018 12:27 AM

The Btu and the kWh (NOT just kW) are both units of energy, and there are lots of places where you can look up conversion factors, as others have shown here.

Any conversion factor is a number indicating that a certain quantity of Unit A is equivalent to (the same as) another quantity of unit B. So One million Btu is indeed the same amount of energy as 293 kWh (in rounded numbers).

BUT! This does NOT mean that a volume of gas which contains one million Btu of energy can be burned to produce steam, and that steam passed through a turbine to spin a generator which produces 239kWh of electric energy.

The fraction of the energy originally in that gas, that can actually be converted into electrical energy, is determined by a long series of efficiencies, depending on the losses that ALWAYS occur at each stage of the process, and how well those losses are minimized.

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#13

Re: BTU/KWH

04/15/2018 9:34 PM

The term "guarantee" usually refers to a contractually agreed to measure of performance between supplier and consumer. Unfortunately, that type of information usually closely guarded by the people who negotiate the the fuel supply contract. You may also see the term used by the providers of the T/G set as the maximum amount of fuel consumed to produce the rating of the plant.

Since I sense that this posting is actually an extension of your previous post, I'm including my response as background material.

"Your problem is not uncommon; when two types of metering (Therms and Kg) are used for the same apparent fuel amount, there will almost always be a discrepancy between the two readings. Further complicating the matter is the fact that you are dealing with a natural product whose GCV (Gross Caloric Value) varies over time.

The supplier's meter is calibrated in Therms at a particular temperature and pressure, but knows nothing about the amount of moisture or the actual heating value of the fuel. It is up to the supplier to provide a guaranteed minimum heating value during the billing period, and the customer has to rely on (trust) those numbers, or provide his own real-time analysis if there is a dispute.

Your check meter(s) integrate the mass (kG) of fuel that passes through them, but have no way to know the amount of moisture that may contribute to that mass, nor the actual time-varying heating value of the mixture passing through it; therefore, there will always be a discrepancy between their measurements and yours.

For the above reasons, all you can do is track the monthly readings, run statistics on them, and see how closely match up to what you expect (aka "the bogey") over many averaged billing cycles. There is no direct fixed mathematical equation that will always be correct since the fuel quality is not deterministic.

Similarly for calculating the overall Heat Rate (British thermal units (Btu) per net kWh generated) of the plant, because it relies on those same statistically varying values."

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#14

Re: BTU/KWH

04/16/2018 7:11 AM

Assuming you mean MMBTU/hr, it's a straight conversion, they're both measures of power. It has nothing to do with any particular equipment - boiler, engine etc with associated losses.

Mathcad calculation

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