Posted by Mark Fields on July 24, 2007, 8:55 pm
daestrom's post about his changes to his house to increase energy
efficiency, and his measure of using the Therms per DD is very interesting
and shows a good way to objectively see the effects of the changes made to
improve energy efficiency.
The factors I have been using are:
1 Therm = 100,000 Btu
Multiply 1 kwH X 3412 to obtain Therms of energy.
Multiply 1 ccf of natural gas x 1 to get Therms of natural gas (maybe this
whould be 1.03?)
Are these fairly accurate?
How much variation in therms can we have per ccf of natural gas we purchase?
Duke Energy only tells us how many ccf's we purchased from the meter
readings.
Mark
Posted by Eeyore on July 25, 2007, 4:34 am
Mark Fields wrote:
> daestrom's post about his changes to his house to increase energy
> efficiency, and his measure of using the Therms per DD is very interesting
> and shows a good way to objectively see the effects of the changes made to
> improve energy efficiency.
> The factors I have been using are:
> 1 Therm = 100,000 Btu
Why are you using such an outdated (and US specific) measure ? The rest of the
world moved on ages back.
Graham
Posted by Eeyore on July 25, 2007, 7:30 am
Steve Spence wrote:
> "Eeyore" wrote
> > Why are you using such an outdated (and US specific) measure ? The rest of
> > the world moved on ages back.
> You typically use what the gas company bills you in. Many gas companies bill
> in therms, so it's convenient to use those units. Why use something else if
> the one we have works for us, and is commonly understood?
It's not commonly understood outside the USA. Even the UK no longer uses therms
or btus. Certainly no other country does.
Graham
Posted by nicksanspam on July 25, 2007, 8:09 am
>Steve Spence wrote:
>> "Eeyore" wrote
>>
>> > Why are you using such an outdated (and US specific) measure ? The rest of
>> > the world moved on ages back.
>>
>> You typically use what the gas company bills you in. Many gas companies bill
>> in therms, so it's convenient to use those units. Why use something else if
>> the one we have works for us, and is commonly understood?
>It's not commonly understood outside the USA. Even the UK no longer uses
>therms or btus. Certainly no other country does.
Wiki on metrification mentions non-metric Liberia and Myanmar (Burma.)
Nick
Posted by Mark Fields on July 25, 2007, 6:41 pm
> Why are you using such an outdated (and US specific) measure ? The rest of
> the
> world moved on ages back.
Frankly for what I'm doing, I don't really care what the rest of the world
is using, I am using a unit which I can conceptualize well enough and it is
a way to measure the total energy purchases for my home.
However, if you would like to post a table of conversions for ccf of natural
gas and kwH of electricity, to convert to whatever unit the rest of the
world is using it would be simple enough to add a column in my spreadsheet.
What are the units and converstion factors?
When you write "ages" do you mean 75 years ago or longer?
Mark
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> efficiency, and his measure of using the Therms per DD is very interesting
> and shows a good way to objectively see the effects of the changes made to
> improve energy efficiency.
> The factors I have been using are:
> 1 Therm = 100,000 Btu