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Posted by geothermaljones on June 5, 2007, 10:27 pm
That reminds me...
I've got to run out & put the summer air in my tires.
I recommend you all do the same.
gl
goj
stpmn
>
> > I'm thinking about using an air compressor to take warm air and
> > compress it to raise the temperature in order to heat up a water tank.
> > Once some of the heat has been removed I would intend expanding the
> > air before reheating in the same way as you would in a heat pump.
> >
> > I have a couple of questions which I would appreciate some views on:-
> >
> > 1). Do systems exist as described above. If yes where can I get more
> > information, if not why not?
> >
> > 2). I calculate the energy required to compress the air is the same as
> > what would be required using conventional heating. If I expand the air
> > in a piston / cylinder I should be able to recover some energy.
> > However if I expand using a nozzle I cannot see where I can recover
> > some of the energy used to compress the air. Can anybody explain
> > what's going on here?
> >
> > 3). I'm unclear regarding the merits of either compressing the warm
> > air removing the heat and then releasing to atmosphere compared with
> > completing the cycle.
> >
> > I studied thermodynamics some years ago but need to get some
> > understanding of the basics involved here.
> >
> > Any thoughts / help welcome.
> >
> > Thanks
> > Numtyhead
> >
>
> Yes, air will work for a heat pump, but in my own experiences I have found
> out that certain types of air works better than other types of air.
>
> The air that I have found to be particularly good for heating or cooling
is
> the air that they put in those little cans of air that they sell at the
> electronics store. They call the can of compressed air "air dusters".
>
> I don't know where they get the air but it generates a lot more heat when
> you compress it than the air that I find around here. They may be getting
> the air from mars or some other planet. It just may be a result of the air
> contaminants in the air around the air duster factory where they get the
air
> from. I don't know, but it isn't really important.
>
> All you have to do is use the air in the air dusters for you air
compression
> system. You want to remember that you want to keep the air duster air
> separated from the air that you are breathing. Otherwise, I have found
that
> the air loses it's good properties. It starts acting like the rest of the
> air that you and me are breathing.
>
> To keep it separated, you have to make the system a closed loop. It goes
> from the compressor to the heat exchanger, then you have to uncompress the
> air by letting it pass through a restriction. When it uncompressed it will
> get really cold because it want to regain the heat that it just lost. Run
it
> through another heat exchanger close to a heat source to allow it to
regain
> it's heat, then feed that though the compressor again.
>
> It seems to work a lot better than the same system with normal air in it.
So
> the canned air definitely has some unique property that I haven't
determined
> yet.
>
> Hopefully the manufactures of the canned air don't find out about it's
> unique properties, because they may stop selling it so cheap. Heck, it's
> good enough that it could even replace that nasty refrigerant they keep
> complaining about. That would definitely make it worth more than they are
> selling it for in the stores.
>
> Good luck with your experiments.
>
>
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