h a l f b a k e r y
add, search, annotate, link, view, overview, recent, by name, random
news, help, about, links, report a problem
or get an account
Person powered vapor compression refrigeration system in a bottle
I'm not sure the pressure or temperature
differentials required here but here goes.
The idea is for a triple walled bottle
containing a pump, some refrigerant and
straw. What I'm envisioning is similar to a
small thermos where the bottom
telescopes out as the pump. The pump
the refrigerant inside the
outer hollow part of the bottle while the
inner hollow part will be a (near) vacuum.
The pressurized vapor (now potentially
liquid) will be stored until the cap is
removed from the straw, at which point
the cooled vapor will circulate in a spiral
fashion inside a tube built into the straw,
thus cooling the beverage in question as
it is drunk.
The outer hollow part of the thermos
should be divided into two sections. This
way the hot[er] vapor can be held on one
side, then compressed by the pump to
other side, run through the straw, and
returned to the hot[er] side. The inner
hollow part is a vacuum to prevent
of the beverage you are trying to cool.
Im sure Ive explained this poorly so
please elaborate on any bones.
Edit: 01/26/07: I've decided to change
the telescoping pump described above in
exchange for a fold-away crank style
pump hidden in the bottom of said
bottle. Also I've decided to add a shaft
that allows the pump to be driven by a
power drill for use at a construction site
or the like.
Edit: 02/07/07: I think having the
condenser coil with a very small diameter
spiral in the outer vacuum chamber and
feed through a controlled expansion
valve into the evaporator coil which
spirals around inside the straw. I have an
illistration if someone can tell me where
to post it.
Images finally added.
techs out there have any input on this?
Vapor compression refrigeraton
[bleh, Jan 25 2007]
here's a crude drawing
[bleh, Sep 25 2007]
here's another crude drawing, this one is powered by an external charging station
[bleh, Sep 25 2007]
||The general idea sounds good, but I wonder if it possible to make much change to, say, a half litre? I'll work in metric - sorry about that- but if you managed to generate at 20W, and 3 times that is heat effectively pumped, then I think that it would take about 12 mins to cool it by 20C. I think after that, you'll need a well earned cold drink.
||thats why I ran the coolant through the straw. I figure (based on nearly nothing) that cooling the small ammounts of liquid as they run through the straw would be more effective that trying to cool the whole thing.
||Perfectly possible. At the Science Museum in london they have a hand-cranked heat exchanger system to demonstrate this effect. If you wind the handle for a while the cold coil can get down to freezing or below. However, you still need to disipate the heat without burning yourself.
||anyone out there have any idea what
kind of pressures this would need? I
have no idea.
||think there would be a problem having
a pressurized section next to one that is
||see edit in body of idea..
||the research i've done on this says
home refrigerators typically have
maximum pressure of about 7.6 ATM in
the condenser coil.
||does that seem safe to be carrying
around in a bottle? what kind of work
would be required to generate that kind
of pressure? if someone can provide the
formulas i'll gladly crunch the numbers.