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Electronic Stirling | 20 comments (20 topical, 0 editorial)
Re: Electronic Stirling (3.00 / 0) (#4)
by inode buddha on Sun Oct 17th, 2004 at 05:49:21 AM MST
(User Info)

Fred, that's fascinating! For the electronic equivalent of your expansion valve, have you considered "Avalanch" diodes? IIRC from my old TV repair training, they exhibit a so-called "negative" resistance when they break over, with large current flows. (This being what they are intended for). I have seen similat techniques used with neon bulbs to make simple "oscillators": a cap charges at a given rate through a resistor, until the neon flashes over (about 90 volts IIRC). Hehehe, you really got my creative juices going, thanks for a great post!



Re: Electronic Stirling (3.00 / 0) (#5)
by JW on Sun Oct 17th, 2004 at 12:08:46 PM MST
(User Info)

iFred,

Ah-ha, I see what your doing. The problem of the "regenerator" in stirling engines is a serious issue. Quite interesting approache to hybredizing an electronic circuit, with pelter juctions, and a working fluid. In reference to "expansion valves" take a look in "Mark's" its a reference book for mechanical enineering. In Marks check,-the definition of what is called "wire-drawing"... Also have you ever heard of what is called "thermo-acustic cooling"? Seems to me it was on the cover of physics today(magazine) in the early 90's. Would be iteresting to incorperate some moving parts in reference to the regenerator, and your electronic hybridization ideas. Keep at it, Nice work...

JW

[ Parent ]



Re: Electronic Stirling (3.00 / 0) (#7)
by iFred (ifred2006@yahoo.com) on Sun Oct 17th, 2004 at 05:10:29 PM MST
(User Info)


Yes, I remember reading about the acoustic heating and cooling experiments that where going on, something that started in a test tube and went to Nasa and some other Labs, they are doing some heavy reseach on it.

>> The problem of the "regenerator" in stirling engines is a serious issue

Yes, you got it! keep going.... Your almost there...

>> all energy used to produce this comment or post came from solar and wind energy! It works!
[ Parent ]



Re: Electronic Stirling (3.00 / 0) (#6)
by iFred (ifred2006@yahoo.com) on Sun Oct 17th, 2004 at 05:06:07 PM MST
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AHHHH! YES! That may do it... Check out this info I found..

http://www.st-andrews.ac.uk/~www_pa/Scots_Guide/RadCom/part5/page1.html

http://en.wikipedia.org/wiki/Negative_resistance

http://home.earthlink.net/~lenyr/ntype-nr.htm

The last link is very cool!

Spark, Bang, Buzz and Other Good Stuff

http://home.earthlink.net/~lenyr/index.html
>> all energy used to produce this comment or post came from solar and wind energy! It works!
[ Parent ]



Re: Electronic Stirling (3.00 / 0) (#8)
by JW on Sun Oct 17th, 2004 at 05:32:52 PM MST
(User Info)

Ya, thats some pretty cool stuff iFred.

 Soooooo, basically your saying that a standard oil-filled automotive style spark-ignition coil's, ALWAY's get warm over-time(in operation) regardless of the DC pulse-train being fed-and-collapsed into it, (again)regardless of secondary high-voltage induction, resistance heat-losses in the electrical-circuit... Let alone the best layered anti-hysteris techniques, that may be applied in the reluctor-core (attempt to reduce induction-heating in flux medium). And... It "is" interesting that simular DC pulse-trains may in-fact produce a "cooling effect" with relation to 'thermo-acustics devices'.

 Brought to you by your local thermodynamics police :)

JW

[ Parent ]



Re: Electronic Stirling (3.00 / 0) (#10)
by iFred (ifred2006@yahoo.com) on Sun Oct 17th, 2004 at 06:23:14 PM MST
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There will always be a 1% loss no matter what or how you define it or how it is produced, however it will be a lot less then any mechanical device could hope to be. Minimalization of losses due to conversion of mechanical to electronic control is far better then suffering losses induced by the analog equivalent of mechanical devices. If you have a transformer just sitting there and powered but without an connection to the secondary you will still have heat due to the magnetic field that touch's any surface that is magnetic and the production of eddy currents, can't get around that, no matter what you do or how you slice it- pun intended. a wall wort is a perfect example.

However, what I am suggesting is that there are devices and methods available today that where not available before, to reduce losses and produce a new device for power control that may not have been suggested before. It's how you look at it, this post is just a simple examination and experiment in thought, it has produced interesting results already, as you are aware, we are now putting to use in circuits things that have not been thought of being put together to produce a new device. With new technology perhaps it's time to look at some of those old devices that where efficient like the heat pump, refrigeration system and yes even the Stirling... BUt what I am doing is attempting to show how this could be done.

So has it accomplished a goal? I believe so, and should be looked at seriously for what that concept holds.

Your oppinion?

>> all energy used to produce this comment or post came from solar and wind energy! It works!
[ Parent ]



Re: Electronic Stirling (3.00 / 0) (#14)
by iFred (ifred2006@yahoo.com) on Mon Oct 18th, 2004 at 01:11:12 AM MST
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To anwser your question simply, yes on all counts.
Read the following link!
http://www.physics.utah.edu/~woolf/acoustics/acoustics.html
>> all energy used to produce this comment or post came from solar and wind energy! It works!
[ Parent ]


Electronic Stirling | 20 comments (20 topical, 0 editorial)

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