h a l f b a k e r yExpensive, difficult, slightly dangerous, not particularly effective... I'm on a roll.
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[edited. summary read: "creates energy" meant power
of course]
A putput engine is a pipe filled with water, with its
ends inserted in water.
The upper end is heated causing the water in the pipe
in that area to boil and turn to steam, pushing the
water
out of the pipe, but by the time
the steam reaches
the
end of the pipe it condenses from the cooling by the
water outside the lower part of the pipe.
New cold water rushes in further cooling down what's
left of the steam which now completely turns back to
warm water.
If (a) instead of two pipes the same width, the pipes
leaving the boiling area where different in diameter,
one being thick and one thin,
And (b) rather than an open end it would culminate in
a
loop,
Then the water would be moving in a constant circle
rather than resonating back and forth.
[link]
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How does this do useful work? |
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A closed loop under steady heat equals balanced pressure at both ends, regardless of diameter. Therefore, no movement, therefore no work ouput. |
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Unless I am misreading this [Marked-For-Deletion] Bad Science. |
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Edit: I am not misreading this, a putt putt engine cannot work in a closed cycle. The venting steam does not condense, it is replaced by new cold water being pulled in due to momentum causing an over exhaustion of the combustion chamber. |
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It could make the noisy refrigerator from hell - where, on a frosty day, it may work. |
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The venting steam definitely DOES condense. See
wikipedia pop pop boat. Water only is going both
ways out and back into the pipe. According to them,
the movement is surprisingly caused by the inward
momentum of the water being transferred to the
boat, while the outward momentum is being
dispersed. |
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This seems to be an erroneous explanation since
adding a "jet" by making both tips thinner adds to the
speed of the boat. |
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Anyways, the circular system would look something
like the
lowercase letter d. Water is filled only halfway of
the bottom "ring" of the d, and the rest is air. |
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On the bottom corner of the "ring" there is a simple
valve that lets water flow one way but not the other.
The right side of d is heated. Steam pushes up into
the top and
downward. water is pushed up and through the valve
compressing the air and steam. |
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circular water flow ensues. |
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No it does not. The pressure against the face of the
valve prevents water movement into the heated
area. |
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You are trying to extract power from a closed loop,
with no temperature/pressure variation. This is not
possible. Even if you have a condenser to remove
heat, the pressure is constant throughout the loop. |
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Your right. Correcting the configuration: |
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putt putt pipes go down into ring which is much wider
than the pipe and is set horizontally on the ground
(with a vertical axis). Water fills most of the ring
with some air above allowing for a pressure wave. |
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once inside the ring the pipes bend 45 degrees into
the plane of the ring. |
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Movement of water back and forth causes water to
flow in a circle. |
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Stage II - stand the ring up partially, so that one side
of the ring is completely filled with water, while the
other is only mostly filled with water and only a small
"air pocket" is available. - Should still work. |
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Finally: stand it on its side, so that now it has a
"horizontal axis" and add the "d" stick (snorkel) on the
right as the air pocket. Have the pipe inserted into
the wheel on the left like an inverted letter Q.
Heating the water in the pipe should cause the water
in the ring to turn. |
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Of course a lot of the incoming energy is going into
heating the water, but hopefully, a nice proportion
of it is going into kinetic energy. |
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show me a motor that runs a boat from a candle and
does a better job... |
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The problem isn't the put-put engine, the problem is
the closed loop. Thermodynamic engines need
differentials to work. In a closed loop with no
moving parts and a constant heat source, you can't
generate a pressure differential, which means no
power out. |
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//Then the water would be moving in a constant circle rather than resonating back and forth.// You may have misunderstood how these motors work. The first thing to realise is that they work perfectly well (and are easier to understand) with only one pipe coming out the back. The double pipe is for ease of filling or construction. |
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However, I'm pretty sure you can make a closed oscillating (not circulating) engine of this type. Take a working (single pipe for simplicity) put put engine. Normally, the end of the pipe is submerged in an open body of water. I can't see any reason why the end of the pipe could not be joined instead to a (cooled) closed vessel partly filled with water. |
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Free water surface:
~~~~~~~ |
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Put put engine:
o_~~~~~~~~
¡ |
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Closed put put engine:
o_0
¡ |
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The cooled vessel essentially models the free water body + atmosphere. It may have to be relatively large. |
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Possibly, if it is extremely large. The problem is
that the closed chamber acts as a shock absorber,
minimizing the overshoot from the putt-putt
action, reducing the water kick-back. The engine
also needs to be able to move independently
inside the chamber (as in traveling around a
central axis or similar). Of course the external
cooling is also required, as you mentioned. |
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At that point, while it could be considered a
"closed cycle with a putt-putt engine", I would
be extremely hesitant to call it a "closed cycle
putt-putt engine". Maybe I'm splitting hairs here,
but you can define any system as closed cycle if
you include the entire universe. |
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