That was "more down-to-earth" relative to Anthony's statement that a
few of them are in orbit. (If Stirling cryocoolers were purely
aerospace items made in small quantities, they'd likely go for
something like $100K; having them mass produced to go in cell phone
towers makes the price more reasonable, although you still have to pay
a lot more than $300 for a new one.)
In any case, the drawbacks of the $10 device have a lot to do with why
one might choose to spend more.
On Mon, Aug 03, 2015 at 03:23:55PM -0500, Edward Wright wrote:
Which has nothing to do with the statement I was responding to --
that cryocoolers are "available at more down-to-earth prices." $300
is not less than $10.
On Aug 3, 2015, at 2:49 PM, Norman Yarvin <yarvin@xxxxxxxxxxxx> wrote:
In this case the original question was about "alternative methods to
chill (or heat) oxidizer", which would involve serious amounts of
heat, making efficiency important.
On Mon, Aug 03, 2015 at 01:17:06PM -0600, qbert@xxxxxxxxxxxxxxx wrote:
Actually they are used on several satellites, CanX-2, and others,
for there simplicity and small size. Yes they are inefficient and
can be a power hog but in the right circumstances they have a place.
Robert
At 12:32 PM 8/3/2015, you wrote:
Right, but as Anthony said, they're "a waste of perfectly good
energy". (The efficiency is atrocious.)
On Mon, Aug 03, 2015 at 01:04:36PM -0500, Edward Wright wrote:CPUs in some microcomputers.
Peltier coolers can be found for under $10. They're used to cool
http://benkrasnow.blogspot.com/2008/08/diy-liquid-nitrogen-generator.html
Sent from my iPad
On Aug 3, 2015, at 9:01 AM, Norman Yarvin <yarvin@xxxxxxxxxxxx> wrote:
On Mon, Aug 03, 2015 at 08:10:31AM -0400, Anthony Cesaroni wrote:
A waste of perfectly good energy. Google "stirling coolers" or
"stirling cryogenic coolers". About as efficient as you can get in a
small package with insane MTBF. There's a few of them in orbit.
They're also used in cell phone towers, so can be had at more
down-to-earth prices.
"Such RF filters with their integrated cryocoolers can be
found on eBay for under $300."
-- Ben Krasnow, at