That is good to know about the results of a book trial, but there are many much less dense, thin or lightweight, things that get frozen which could easily warm up during a defrost cycle. I would love to see data from a logger inside a package with a feather diadem for instance. Linda
On Wed, Dec 12, 2018, 3:01 PM 'bugman22' via Museumpests < [email protected] wrote: > I agree totally with Alan. If anything, the defrost cycles stress the > critters even more. Go for it. > > Tom Parker > > > -----Original Message----- > From: Alan P Van Dyke <[email protected]> > To: pestlist <[email protected]> > Sent: Wed, Dec 12, 2018 5:32 pm > 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/415028324.3380274.1544655683001%40mail.yahoo.com > <https://groups.google.com/d/msgid/pestlist/415028324.3380274.1544655683001%40mail.yahoo.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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