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4hv.org :: Forums :: General Science and Electronics
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Energy Density and Conversion.

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Patrick
Sun Jan 22 2017, 01:57AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I need help these units of energy, power and time have my brain all upside down.

If I have 300ml of methanol which is 0.0364 M joules per Liter, (and assuming 100% efficiency) for how many seconds can I get 300 watts ?

starting here, 1 L / 0.3 L = 3.3 then,
0.0364 MJ / 3.3 = 0.011 MJ available in the 300ml.

next 0.011 MJ = 11,000 J.
And 11,000 J / 300 W = 36 seconds is totally wrong.

This dimensional analysis is driving me nuts. Its right in front of me too, i just know it. theres a time value missing i think.
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Plasma
Sun Jan 22 2017, 03:23AM
Plasma Registered Member #61406 Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Patrick
Are you sure 0.036MJ/kg is correct, most fuels seem to be around 1-20MJ/kg.
I tried looking on engineering toolbox website but they didn't have methanol.
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Bjørn
Sun Jan 22 2017, 03:24AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
I got the same result, your value for energy content of your methanol looks to be completely wrong, unless it is diluted to the extreme.
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Patrick
Sun Jan 22 2017, 03:31AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Link2 the great all knowing wiki doesnt lie. bow to its greatness. submit to its power.


1485056197 2431 FT1630 Methanol


mmmm apparently if i use the wrong numbers i get the wrong answer. Methane and Methanol perhaps are different chemicals. dead
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Bjørn
Sun Jan 22 2017, 03:39AM
Bjørn Registered Member #27 Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
You used the value for methane instead of for methanol.
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Patrick
Sun Jan 22 2017, 03:41AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
i just realized that !
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Patrick
Mon Jan 23 2017, 04:14AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ok lets try this with a clear mind.

15.6 MJ / 3.3 = 5.2 MJ available in 300mL
5.2 MJ / 300 W = 17333 / 3600 sec/Hr = 4.8 hours.

4.8 Hr x 0.25 (%) = 1.2 hours.

this seems right ? I think.
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