[Greenbuilding] Energy Numbers

[Jessica]

In my field, solar, the sales pitch is supposed to include the ROI
analysis. I think that defeats the purpose. @252 calories,g per BTU, the
human body may metabolize 100,000 BTU(2520 KG calories)/ day for as little
as $2 worth of food but if we ran on natural gas, we could sustain our
bodies for only $1.20/day! But how would that effect our return on
investment and what about the down payment!!! Calculation corrections are
extremely welcome.

Jessica

On Sun, Jul 15, 2012 at 4:51 PM, Joe Killian <kaa-ajk at sonic.net> wrote:

> **
>   If the nuts & sucrose & other hydrocarbons in the candybar are oxidized
> (burnt), they release this much energy.  It's how much energy is available
> from the candy bar using chemical reactions.  It's what our bodies use as
> an energy source.
>   Shows how efficient animal metabolism is.  We all know intuitively that
> burning a candybar in any man-made vehicle (even one of 120 pounds) would
> nowhere near move that machine the 7 miles or so the woman would travel in
> the hour.
>   I remember in high school (too many years ago to count) the class being
> led through calculating how many pullups the energy in a sugar cube would
> supply energy for.  I don't remember the number, but it was quite a few.
> There's a lot of room to make our machines a lot more efficient than they
> currently are.
>
>   Joe
>
>
> On 7/15/2012 8:10 AM, Reuben Deumling wrote:
>
> This comparison I didn't understand:
>
> Explosion of 1 kg of TNT 10e6 Joules
> Woman running for 1 hr  10e6 Joules
> Candy bar                       10e6 Joules
>
> I'd like to know a little more about how these numbers are calculated.
> Presumably in the case of TNT it is energy released; in the case of the
> woman it is expended, but in the case of the candy bar I'm not sure -
> contained in the nuts and sucrose? Seems kind of gimmicky.
>
> On Sun, Jul 15, 2012 at 7:51 AM, Gennaro Brooks-Church - Eco Brooklyn <
> info at ecobrooklyn.com> wrote:
>
>> Here is an interesting breakdown of different energy amounts:
>> http://www.ocean.washington.edu/courses/envir215/energynumbers.pdf
>> For example the energy content of a candy bar vs. a pound of coal.
>>
>
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-- 

Jessica Baldwin
917-207-2403
Solar Plumbing Design <http://www.solarplumbingdesign.com>
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