Thank you everyone for your thoughts. I will share this info with the rest of the staff that works with the freezer.
Alan- I will check to see if there is room in the budget for another data logger. It would be interesting to place one inside an object like the dictionary, and see how that compares to the spikes seen in the open air monitor. Thanks again everyone- Interesting and helpful info! -Todd On Thu, Dec 13, 2018 at 7:10 AM Voron, Joel <[email protected]> wrote: > 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] > > > [image: 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 > > > On Wed, Dec 12, 2018 at 4:22 PM Todd Holmberg <[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]. > 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/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]. > 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/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 > <https://groups.google.com/d/msgid/pestlist/BN6PR05MB3122508A7461A7D3CE0EB366DCA00%40BN6PR05MB3122.namprd05.prod.outlook.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. 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