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Re: Diesel from new/used wast oil...? Eeyore 07-03-2008
Posted by daestrom on July 7, 2008, 7:20 pm
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 Piccolo Pete wrote:
>>
>>
>> daestrom wrote:
>>
>>> To find the *theoretical* energy, convert the gallons to pounds
>>> 55 gal * 8.33 = 458 lb of water
>>>
>>> Then figure out how far you could let the water 'fall'. Two story,
>>> let's say 20 ft for 'round numbers'. Multiply the weight times the
>>> height to get
>>> ft-lb of work
>>>
>>> 458lb * 20ft = 9163 ft-lb of work
>>>
>>> There are 778 ft-lb in a BTU, or 2655200 ft-lb in a kWhr. So we're
>>> not getting a lot here with only 9163. About 12 BTU.
>>
>> How you manage to do these sums in mixed American and metric units
>> never fails
>> to amaze me.
>>
>> Graham <amazed>
>>
>
> Something like:
>
> http://www.onlineconversion.com/
>
> Possibly? Or maybe "he, she, it" is simply not human and has to
> convert all this stuff from Zeta Reticuli math anyway.
>

Close. But if you assimilate enough cultures, you find yourself versital in
a variety of units of measure. :-)

daestrom


Posted by Ulysses on July 7, 2008, 12:47 pm
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>
>
> daestrom wrote:
>
> > To find the *theoretical* energy, convert the gallons to pounds
> > 55 gal * 8.33 = 458 lb of water
> >
> > Then figure out how far you could let the water 'fall'. Two story,
let's
> > say 20 ft for 'round numbers'. Multiply the weight times the height to
get
> > ft-lb of work
> >
> > 458lb * 20ft = 9163 ft-lb of work
> >
> > There are 778 ft-lb in a BTU, or 2655200 ft-lb in a kWhr. So we're not
> > getting a lot here with only 9163. About 12 BTU.
>
> How you manage to do these sums in mixed American and metric units never
fails
> to amaze me.

Yea, especially when the American standard of measurement keeps changing. A
pound is now about 12 or 13 ounces and a half gallon is somewhere between
three and three and a half pints. Soon they will be making miles shorter so
we can get better gas mileage.

>
> Graham <amazed>
>



Posted by daestrom on July 7, 2008, 7:19 pm
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Ulysses wrote:
>>
>>
>> daestrom wrote:
>>
>>> To find the *theoretical* energy, convert the gallons to pounds
>>> 55 gal * 8.33 = 458 lb of water
>>>
>>> Then figure out how far you could let the water 'fall'. Two story,
>>> let's say 20 ft for 'round numbers'. Multiply the weight times the
>>> height to get ft-lb of work
>>>
>>> 458lb * 20ft = 9163 ft-lb of work
>>>
>>> There are 778 ft-lb in a BTU, or 2655200 ft-lb in a kWhr. So we're
>>> not getting a lot here with only 9163. About 12 BTU.
>>
>> How you manage to do these sums in mixed American and metric units
>> never fails to amaze me.
>
> Yea, especially when the American standard of measurement keeps
> changing. A pound is now about 12 or 13 ounces and a half gallon is
> somewhere between three and three and a half pints. Soon they will
> be making miles shorter so we can get better gas mileage.
>

Rubbish. Pound is still the same and half-gallon is still four pints.

What *does* get wacky is when marketers start changing the size of
'standard' items. Same price but a few oz less so you don't notice a 'price
increase' :-)

daestrom


Posted by daestrom on July 7, 2008, 7:33 pm
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Eeyore wrote:
> daestrom wrote:
>
>> To find the *theoretical* energy, convert the gallons to pounds
>> 55 gal * 8.33 = 458 lb of water
>>
>> Then figure out how far you could let the water 'fall'. Two story,
>> let's say 20 ft for 'round numbers'. Multiply the weight times the
>> height to get ft-lb of work
>>
>> 458lb * 20ft = 9163 ft-lb of work
>>
>> There are 778 ft-lb in a BTU, or 2655200 ft-lb in a kWhr. So we're
>> not getting a lot here with only 9163. About 12 BTU.
>
> How you manage to do these sums in mixed American and metric units
> never fails to amaze me.
>

You grow up with one set, and then in college switch to the other set. Then
in work you use the first set most every day, but when dealing with
'fereners' you have to work with the other.

Switch-hitting becomes second nature.

daestrom
P.S. Not that I've never screwed up. But writing the units out with each
term and doing proper cancelation and unit analysis catches most mistakes.


Posted by Eeyore on July 7, 2008, 11:37 pm
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daestrom wrote:

> Eeyore wrote:
> > daestrom wrote:
> >
> >> To find the *theoretical* energy, convert the gallons to pounds
> >> 55 gal * 8.33 = 458 lb of water
> >>
> >> Then figure out how far you could let the water 'fall'. Two story,
> >> let's say 20 ft for 'round numbers'. Multiply the weight times the
> >> height to get ft-lb of work
> >>
> >> 458lb * 20ft = 9163 ft-lb of work
> >>
> >> There are 778 ft-lb in a BTU, or 2655200 ft-lb in a kWhr. So we're
> >> not getting a lot here with only 9163. About 12 BTU.
> >
> > How you manage to do these sums in mixed American and metric units
> > never fails to amaze me.
>
> You grow up with one set, and then in college switch to the other set. Then
> in work you use the first set most every day, but when dealing with
> 'fereners' you have to work with the other.
>
> Switch-hitting becomes second nature.
>
> daestrom
> P.S. Not that I've never screwed up. But writing the units out with each
> term and doing proper cancelation and unit analysis catches most mistakes.

Interesting you managed to do that.

Physics is my #1 subject but I did poorly in my first year because we started
with Imperial units, then swiched to cgs and then switched to MKS (virtually
SI).

It was only when I could understand a fully coherent set of units like MKS/SI
that I then shot to the top of the class.

Graham



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