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Some thoughts & idea's :<br>
<br>
" 40-50 amps " doesn't say much; at which voltage, for how long?<br>
If you want to pull 50 amps @ 12 volts for a 1 hour tour,<br>
you'll need 600 Watt hour<br>
<br>
Are you sure a 1 ton boat with a (very) wimpsy 0,6 kW electric
motor,<br>
will still go forwards with some wind ahead or going a bit upstream
a river ?<br>
<br>
Your talking about a 55000 btu/hr stove as heat source to power a
0,6kwh electric engine...<br>
Thats 16 Kwh input for 0,6 kwh output... Lots of waste<br>
<br>
<br>
On that TEG site i don't see any TEGP15 model;<br>
their "Model: UTEGEC" talks only about volts not amps or watts (
O.K., max 0,5 amps); and <br>
their<font color="#0000ff" size="5"><span style="color: black;"><span
style="color: black;"><font color="#0080c0"><font size="3"><font
color="#000000"><font size="4"><font size="4"><font
size="4"><font size="4"><font size="4"><font
size="4"><font size="4"><font size="4"><strong>
50 Watt Power Strip </strong>(Thermoelectric
Generator) <strong>Model:</strong>
TEG50WPS</font></font></font></font></font></font></font></font></font></font></font></span></span></font><br>
makes 50 watt max, so you need at least 12 of them; +- 500 x 12 =
6000 $<br>
without your heatsource.<br>
<br>
Did you noticed thise devices are pretty in-efficient? 5-10% ( they
say/claim, more realistic imho 1-3%)<br>
<a class="moz-txt-link-freetext" href="http://en.wikipedia.org/wiki/Thermoelectric_generator">http://en.wikipedia.org/wiki/Thermoelectric_generator</a><br>
<br>
Why do you talk / need gasification, if you only seems to need heat?<br>
Why not make woodgas and run it into an old Lister or a
Lister-(chinese)-look-a-like ?<br>
Or other converted diesel engines.<br>
<br>
You end up with manytimes more energy at your screw, to really move
that boat,<br>
and, ... you still can capture some waste heat to charge a battery
for your electric needs.<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.lister-petter.co.uk/products.php">http://www.lister-petter.co.uk/products.php</a><br>
<br>
<a class="moz-txt-link-freetext" href="http://www.youtube.com/results?search_query=lister&aq=f">http://www.youtube.com/results?search_query=lister&aq=f</a><br>
<br>
<a class="moz-txt-link-freetext" href="http://www.youtube.com/results?search_query=lister+woodgas&aq=f">http://www.youtube.com/results?search_query=lister+woodgas&aq=f</a><br>
<br>
Grts<br>
Bruno M.<br>
<blockquote
cite="mid:20110518210336.Horde.pzohfmOelG9N1CYYEoHR4lA@slackmail.co.uk"
type="cite">
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
Hi all
<br>
<br>
I wish to move a 22ft 1 tonne boat using wood power.
<br>
<br>
I have already considered gasification + combustion, gasification
+ stirling engines, even steam power!
<br>
<br>
My latest thought experiment is gasification + thermo-electric
generators.
<br>
<br>
looking at the products of tegpower.com it seems like this may be
viable, if somewhat expensive (£4k)
<br>
<br>
To move the boat at around three knots will take an estimated 40
-50 amps <a class="moz-txt-link-freetext" href="http://www.floveroutboard.co.uk/outboards.html">http://www.floveroutboard.co.uk/outboards.html</a>
<br>
<br>
Which will require approximately 50 of the TEGP15 thermo electric
panels <a class="moz-txt-link-freetext" href="http://www.tegpower.com/products.html">http://www.tegpower.com/products.html</a>. I then need to keep
one side of the panel at 20C (or lower) and the other at 260C.
(but no higher than 325C)
<br>
<br>
Initially I considered doing this with an active water pump driven
cooling system, which would be fine, however if the pump/wiring
fails or gets blocked the considerable investment in TEG panels
melts before your eyes.
<br>
<br>
So I figured given all the water around the boat it might be
better to run a passive cooling system, and actively pump the air
for the gasifier. That way if something breaks it just cools down
and stops working.
<br>
<br>
Which leads me to the challenge of gasification underwater..
<br>
<br>
I have taken as a benchmark the mega fireplace gasifer
<a class="moz-txt-link-freetext" href="http://www.woodgas-stove.com/how_to_use_woodgas_stoves.php">http://www.woodgas-stove.com/how_to_use_woodgas_stoves.php</a> which
puts out 55,000 btu/hr which on paper is enough power.
<br>
<br>
So I am thinking about taking take a 14inch x 6ft diameter steel
pipe with a sealed end and sticking a woodgas fireplace in it.
Then feeding a air supply pipe down to the bottom, and using a fan
to force the air in.
<br>
<br>
The TEG units will be attached to the inside of the pipe with some
kind of heat conducting cement. The water temperature outside the
pipe (typically 5C - 15C) will provide the passive cooling, and
the heat rising up from the stove will heat the inner panel
(maybe!)
<br>
<br>
I did a bad diagram here: <a class="moz-txt-link-freetext" href="http://i.imgur.com/SYpu2.jpg">http://i.imgur.com/SYpu2.jpg</a>
<br>
<br>
I realise the engineering challenges of this are not trivial..
<br>
<br>
* Are forced updraft gasifiers harder to make/ less efficient on
this scale?
<br>
<br>
* What would be a good guesstimate for the temperature at the
bottom TEG? The top TEG? Above 325C?
<br>
<br>
The next step is to buy a the pipe and woodgas fireplace and do
some real world tests. Is it worth me taking that next step? Do
you see insurmountable problems?
<br>
<br>
Thanks
<br>
<br>
Sam
<br>
===================================================<br>
_______________________________________________
<br>
<br>
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