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The need for a 200bar pump puts me off that approach and the high prices of the cryocoolers and the descriptions of them bashing themselves when the temperature sensors break off put me off those. With some machining access I'd certainly be trying to make a stirling cooler. There are designs that separate the compressor from the displacer. Not the most efficient, but much easier to make I think. One unit drives the pressure, and it's a compressor with no valves. The other unit has a smaller volume and contains the displacer, they are connected by a thin tube and driven 90 degrees out of phase. The driving piston never gets cold as is the case with all practical stirling designs. Even without regenerator action you'd only need, what 4:1 or 5:1 compression ratio to get liquid air?
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
I would love to see someone make his own Stirling cooler, but I think the cost of the tools would be way more than my approach. I've been asked by many if a regular refridgerator compressor would work with my regenerative tower. I'm sure if one gets a high enough flow it should work just the same: it would just be slower since you won't get as great a temperature drop at the expansion valve.
As long as you can bend the tubing and get some good thermal insulation you can do it with a less expensive compressor. I get about 350cc/hr.
Registered Member #230
Joined: Tue Feb 21 2006, 08:01PM
Location: Gracefield lower Hutt
Posts: 284
For the amateur the more simple expansion engine is far easier. The engine has to work against a load ie generator and a resistor bank. heat leakage minimisation is the key to all solutions. Green forward biased leds are a good solution for temp measurement they work down to below LN2 temps
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Theory, Maths and Machining of a Stirling Cryocooler.
