[AR] Re: Peltier specifications
- From: Peter Fairbrother <zenadsl6186@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 04 Aug 2015 03:06:08 +0100
On 03/08/15 22:51, Anthony Cesaroni wrote:
I actually have a couple of portable coolers that use them. You can
leave them on freeze mode overnight in your car or truck using the
battery and have plenty of power to start the engine in the morning.
That won't happen with a TED and you won't be able to freeze things
either although I do have a patent on one design that does.
Details please?
I have seen an ice cream maker which runs on Peltiers. Uses about 500W,
took about 30 mins to make 1 litre on a cool day in London, say 16C
ambient.
Not at all efficient, but that's only a few pence/cents of lekky. so who
cares?
Initial cooling does not use cascaded Peltiers, but I think the later
stages might. Was sold in Scandinavia though, so maybe not?
I once worked out that to cool to LOX temps I would need about 511
cascaded Peltiers, only one of which would be actually working at proper
efficiency ... ouch.
The same
Stirling engine core is used for cryo coolers and they are quite
reasonable in terms of cost. No surprise but as soon as you mod or
spec. the unit for cryo performance, it falls under export
regulations.
The moving parts have no metal to metal contact. Everything floats on
a helium gas bearing. They run almost forever.
Yeah, Stirlings are pretty cool. I like pulse tube coolers as well.
Though I think I'd go with a fairly standard mixed-refrigerant JT for my
home-build LOX cryocooler (if I ever get around to building one).
-- Peter F
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