On Mon, Oct 13, 2014 at 6:17 PM, ed breya e...@telight.com wrote:
I have experimented with R-12 type mini-friges for this purpose - they can
typically reach minus 40 deg running continuously, but will be oil-starved
at the high vacuum, low flow conditions there, so may not last long
compared
Hi
On Oct 13, 2014, at 10:09 PM, Jim Lux jim...@earthlink.net wrote:
On 10/13/14, 4:17 PM, ed breya wrote:
I have this nice little thermoelectric 12-bottle wine cooler (about
one cubic foot inside) that I've fixed twice already, and it just
crapped out again. It's always the same thing - bad
Uhmm? How does that differ from any heat pump, such as say, a freon
cycle refrigerator?
The biggest problem with Peltier coolers is they have a very low
thermal resistance shunt (all of the thermocouple junctions) between
the hot side and the cool side. If you turn them off, the hot and
cool
A TEC is not a very good device for cooling a large enclosure. It works
for the case of a wine coolers because (1) you don't need wine to be very
cool, 55F is fine and you don't open the door very often either. But TECs
do have a good use where they ar perfect. That is cooling some small
On 10/14/14, 6:13 AM, Chuck Harris wrote:
Uhmm? How does that differ from any heat pump, such as say, a freon
cycle refrigerator?
The COP for thermoelectric coolers (heat moved vs power consumed),
particularly at large delta T, is fairly poor, compared to heat pumps.
A heat pump might
Attached a picture hope it goes through Bert Kehren
You can, however, make large stacks of Peltier coolers, hot to cool,
and cool them down to liquid air temperatures. This is done on
very low noise LNA's.
-Chuck Harris
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When you stack them you trade the amount of heat that you can pump for the
larger delta temperature. So yes you can cool a tiny chip to cryogenic
temperature. But only a tiny chip
On Tue, Oct 14, 2014 at 6:41 AM, Bert Kehren via time-nuts
time-nuts@febo.com wrote:
Attached a picture hope it
I have this nice little thermoelectric 12-bottle wine cooler (about
one cubic foot inside) that I've fixed twice already, and it just
crapped out again. It's always the same thing - bad caps in the
switching power supply - they're just too small to take the necessary
ripple current. So, I
Hi
If you go crazy with one of these things, you can get it down to 40 F or so. In
a cold room, you might get to 30F.
As a test chamber they have a really slow response speed and lousy thermal
control. The TEC is running at max most of the time and that does not leave
much room for control.
The worst thing about those small refrigerators is that were NEVER designed
to cool objects that PRODUCE heat. A wine bottle does not burn any
electrical power. If you place even the smallest heat producing
electrical device inside the cooler it is going to have to pump out
whatever heat is
On 10/13/14, 4:17 PM, ed breya wrote:
I have this nice little thermoelectric 12-bottle wine cooler (about
one cubic foot inside) that I've fixed twice already, and it just
crapped out again. It's always the same thing - bad caps in the
switching power supply - they're just too small to take the
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