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#Post#: 403--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: burnit0017 Date: September 16, 2013, 10:47 am
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Hi, I think it depends on the size of the engine and how steam
you can generate. I am thinking about switching to a smaller
engine. I have one modification to make to the boiler than I
should know.
The system above is small and is a complete closed system. It is
generating electricity but I do not if it is producing more
current then it is using. I think the trick is to use a MPPT
with the PMA and not waste power as heat at the stator.
#Post#: 404--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: crazyguy Date: September 16, 2013, 11:34 am
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HTML http://www.green-planet-solar-energy.com/water-pressure.html
I still don't know why you can't get the feed pressure from
gravity. 40 gallons = 320 psi. Can someone tell me??? Am I
stupid or missing something?
#Post#: 405--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: burnit0017 Date: September 16, 2013, 12:46 pm
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Hi, I do not know, but for me to fill a 40 gallon tank every
time after shutdown would be difficult in the winter time.
#Post#: 406--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: crazyguy Date: September 16, 2013, 1:26 pm
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I've been doing some reading. It seems that the pressure depends
on "head" or height. So even though you have 500 pounds of water
in the tank it's the height of the tank that makes the pressure.
something like 1 psi for every 2.3 feet of height.
I'll have to experiment. My mind is not wrapping around this
"head" thing, wouldn't the diameter of the pipe have something
to do with it?
#Post#: 408--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: crazyguy Date: September 16, 2013, 2:40 pm
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okay here is the long and short of it. If my math is correct
(good luck with that !).
A 3/4" diameter pipe 12 feet long filled with water and aligned
in the vertical will have 2.28 pounds of water pressure at the
bottom.
Blows my theory out of the water.
[attachment deleted by admin]
#Post#: 409--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: crazyguy Date: September 16, 2013, 2:49 pm
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Check this out, might be worth reading and joining, they talk
about your type project.
HTML http://www.survivalistboards.com/showthread.php?t=15761
#Post#: 410--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: burnit0017 Date: September 16, 2013, 6:01 pm
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Hi, results from todays test, the max pressure reached was 16
psi. That was running the fire at max for a hour. Adding the
steam drum was a bad idea. It just acted like a condenser. I
plan to remove it and concentrate on establishing a water feed
rate to increase the engine run time. I will have to add a dc
motor to the water feed pump and use a PWM circuit to adjust the
speed. I will post results when available.
#Post#: 411--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: mad murdock Date: September 16, 2013, 9:05 pm
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For gravity water pressure, you figure 1 psi for every 16-18" of
vertical height. Does not matter the quantity of water or the
size of the pipe. The weight of water is constant as is the
force of gravity. We have a spring box that feeds fresh water to
our house, the box is about 60' vertical above the level of the
house and the pipe run is almost 900 ft. We get about 30 psi at
the faucet.
#Post#: 412--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: burnit0017 Date: September 17, 2013, 7:31 am
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HTML http://modernsteampower.wordpress.com/essay-on-steam-theory/
Hi, here is a good article, worth the time to read.
#Post#: 413--------------------------------------------------
Re: Starting flash "mono-tube" boiler fabrication
By: crazyguy Date: September 17, 2013, 8:14 am
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YIKES !!
Sounds like the wood gasifier and Internal combustion is easier
on my limited brain cells. And budget.
I think The staff at Mother Earth News mag drove across the USA
on a pickup powered by wood gas.
Put up the schematic for the mppt again I lost it.
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