Re: Has this been invented yet?

In misc.survivalism, Terryc <newsthreespam-spam@xxxxxxxxxx> wrote:
EskWIRED@xxxxxxxxxxxxxxxxxxx wrote:

That's why I'm asking. ISTM that a campfire supplies million of Btus.

The problem is that it is no longer a campfire if you efficently capture
it.

I don't care about efficiency. There is an infiite amount of fire, for my
purposes. And If it were captured efficiently, I could charge a zillion
cellphones, but all I need to do is to charge one.

So some little inefficient device would be great.


But the central concept is that the campfire already exists, spewing out
huge amounts of energy.

By labouring under this concept, you are effectively cutting off one
arm. Alternatively, it like having a horny woman and having her drag the
cart and fscking the mule. If you want to make efficent use of the wood
for survival purposes, then fireboxes and/or boilers are designed to do
that.

Naw, that is not what I want to do. I want to waste the vast majority of
the wood heating up the great outdoors, and use a tiny fraction to charge
my cellphone.


Frankly, a campfire is more a psychological tool for moral. The novelty
of anything else wears off really quick when you have to use them to
cook 24x7x365.

Yeah, but for fun 24x7x14, they are a central means of entertainment (and
delicious food, like salmon, steaks, etc.). Generally, we get back to the
site in late afternoon, make a cooking fire, and start piling on mucho
logs when the sun starts to set.


The other major problem is that millions of BTUs is very hard to control
and requires robust equipment, or it becomes a chore to control it so
that expensive thermocouple pile doesn't suddenly convert to a pile of
molten metal at the bottom of the coals, Or you distort the tube of the
stirling engine from a glowing hot spot in the wall, etc, etc, etc.

Yep, I can see that the materials would have to withstand 1000 or 1200
degrees. Does it get hotter than that in a pile of hardwood embers? But
if the boiler were mostly full of water, wouldn't that limit its temp to
212?

I have some pressure vessels that are intended as stovetop espresso
makers. Basically, they are stainless boilers that you put on your
stovetop, with built-in valves ad safety pressure-release ball and spring
valves. They can withstand a fair amount of heat and pressure.

If you are serious, I'd recommend the boiler and steam driven generator
as the most feasible method. Your firebox can be a conveniet thin wall
drum (20L=3gal(?) of which you have a suppy and pick/pix holes in the
side and put a pressure water vessel on top. With a proper regulator,
you shold be able to turn over a single cylinder steam piston and drive
a generator. Of course, single cylinder works best with a flywheel, but
that is weight. double acting would be next step up.

If you build a boiler like those NZ kettles with the central chimney,

Huh? What are those?



they you might even be able to tap super heated steam and get better
expansion properties.

They will be plenty of live steam modellers (rail, engine and boat) that
will help you learn to build an engine.

I was thinking of something self-contained and portable. These days,
there are lots of small, cheap generators, like the wind-up ones built
into radios and flashlights.

--
The whole problem with the world is that fools and fanatics are always so
certain of themselves, but wiser people so full of doubts.
-- Bertrand Russel

.

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