Re: Dish Stirling v Bio Diesel; Mechanical Work/Acre-Year
- From: "daryl" <darylz1@xxxxxxxxxxx>
- Date: Fri, 25 Apr 2008 15:06:15 -0400
No, algae needs sunlight, but its growth cycle is 2x per day or higher, so
the fact that it slows down to nothing during the night time is not really a
factor.
I think you could also argue that if you're able to produce biodiesel from
algae at ridiculous rates per day, you could afford to run diesel-powered
lighting at very low cost, increasing the yield even higher.
Another factor to keep in mind is that algae production removes huge amounts
of CO2 from the atmosphere at same time.
So, if the next president of the USA decides to sign the Kyoto Protocol,
there's more positive cash flow in the form of carbon credits.
"Al G" <agerhart2@xxxxxxxxxxxxxxxxxx> wrote in message
news:DkoQj.35$TM1.8@xxxxxxxxxxxxxxx
"Bret Cahill" <BretCahill@xxxxxxx> wrote in message
news:d4cdf11b-97bd-46d4-8021-530a81eb8758@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Assuming it can be made to work the yield from algae is claimed to be
30,000 gallons diesel/acre-year. This comes out to be 30 kW/acre
(24/7/52).
This is over 3X the gross income as growing berries so it is probably
economical especially considering the quality of the land doesn't
matter.
Taken along with the 40% efficiency of a diesel engine, the mechanical
work from algae oil is only 12 kW/acre (24/7/52).
Dish Stirling averages over 120 kW/acre mechanical work (24/7/52).
Now, to be sure, no one will deny that liquid fuel is often a
convenient way to store and transport energy, but even if the
electrical energy storage device, i. e., battery, pumped water, etc.,
is only 10% efficient, dish Stirling _still_ beats bio diesel in mech.
energy/land use.
Bret Cahill
You're going to grow algae at night?
Solar stirling at night and in bad weather?
I don't think so...
Al G
.
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