I was under the impression that all freezers have a "defrost" cycle for the
evaporator coils.....A "Frost Free" defrost cycle is a freezer that you would
want to avoid as this warms the side walls on the interior. The refrigeration
"reversal" which draws a small amount of ambient air into the evaporator
defrosts the coils in order for the compressor to operate and is just necessary
for the machines to function and not have the machinery freeze up into a solid
block of ice. The evaporator coil defrost cycle may be responsible for the
negligible difference in temperature. - 14 for a few mins is still very cold
and should have no ill effects on anyone's outcome of treatments. The extreme
drop of temperature in cold treatment is what really produces results. JTV
Joel Voron Colonial Williamsburg Foundation
Conservation Dept.
Integrated Pest Management
Office 757-220-7080
Cell 757-634-1175
E-Mail [email protected]
[1474552137245_IMG_0499.JPG]
________________________________
From: [email protected] <[email protected]> on behalf of Alan P
Van Dyke <[email protected]>
Sent: Wednesday, December 12, 2018 5:32:13 PM
To: [email protected]
Subject: Re: [pestlist] Freezer Temp Question
Our freezer does the same thing, and we haven't noticed any affect on
treatment. Items in the freezer will hold their temperature pretty well during
those short spikes - it's mostly the air temp that is affected.
My predecessor hollowed out a paperback dictionary just enough to accommodate a
thermometer so we could monitor how stable the temperature of the inside of a
book is. We were pretty impressed how little it moved once down to temperature.
Alan
Alan Van Dyke
Senior Preservation Technician
Harry Ransom Center
The University of Texas at Austin
P.O. Drawer 7219
Austin, TX 78713-7219
P: 512-232-4614
www.hrc.utexas.edu<http://www.hrc.utexas.edu/>
On Wed, Dec 12, 2018 at 4:22 PM Todd Holmberg
<[email protected]<mailto:[email protected]>> wrote:
Hello Pestlist,
I have a question related to freezing treatment temperatures.
At the museum I work at, we recently put a data logger in our freezer. We took
the readout this morning, and now have our first chart showing the temperature
conditions inside over the course of a full 7-day week. Something came up on
the readout that I wanted to run past this group and see if anyone had any
opinions on it.
The "base/normal" temp in the freezer is -28 F, and it holds that pretty
steady. There were 8 temp spikes though. The doors remained shut the entire
week, and my guess is the spikes are related to a defrost cycle. The spikes
were all virtually identical and lasted 55 minutes. The temp went from -28 to
-14, then back to -28, with about 20-25 minutes of temps warmer than -22 (I
have heard -22 F is a significant temp relating to freezing effectiveness- is
that true?).
Does anyone have an opinion on whether or not spikes where the temp rises
between -22 F and -14 F for 20-25 minutes would have a significant affect on a
freezing treatment? My guess is there will be approx. 10 of these spikes per
week, but we will see about that as more weekly charts come in.
If anyone has an opinion or thoughts they would be appreciated.
Thanks,
Todd
--
You received this message because you are subscribed to the Google Groups
"Museumpests" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to
[email protected]<mailto:[email protected]>.
To post to this group, send email to
[email protected]<mailto:[email protected]>.
Visit this group at https://groups.google.com/group/pestlist.
To view this discussion on the web visit
https://groups.google.com/d/msgid/pestlist/CAMxAh%2Bi_c%3DmzW1kaQd1Om3iPPsQTbh-X%2B-4i2Cc018dYrPFQ%3Dw%40mail.gmail.com<https://groups.google.com/d/msgid/pestlist/CAMxAh%2Bi_c%3DmzW1kaQd1Om3iPPsQTbh-X%2B-4i2Cc018dYrPFQ%3Dw%40mail.gmail.com?utm_medium=email&utm_source=footer>.
For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google Groups
"Museumpests" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to
[email protected]<mailto:[email protected]>.
To post to this group, send email to
[email protected]<mailto:[email protected]>.
Visit this group at https://groups.google.com/group/pestlist.
To view this discussion on the web visit
https://groups.google.com/d/msgid/pestlist/CAHhLO3YKJ0wuDF4APj%2BVu71F3GXj8OuGrvoZsZg-o4tcXJJ1AQ%40mail.gmail.com<https://groups.google.com/d/msgid/pestlist/CAHhLO3YKJ0wuDF4APj%2BVu71F3GXj8OuGrvoZsZg-o4tcXJJ1AQ%40mail.gmail.com?utm_medium=email&utm_source=footer>.
For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google Groups
"Museumpests" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/pestlist.
To view this discussion on the web visit
https://groups.google.com/d/msgid/pestlist/BN6PR05MB3122508A7461A7D3CE0EB366DCA00%40BN6PR05MB3122.namprd05.prod.outlook.com.
For more options, visit https://groups.google.com/d/optout.
