This is a message from the Museumpests List. To post to this list send it as an email to [email protected] To unsubscribe please look at the footer of this email. ----------------------------------------------------------- Hello Tom,
Thank you- we did achieve 5F within 48 hours. I appreciate your assessment of the data. Take care, Dana On Mon, Mar 12, 2012 at 11:08 AM, <[email protected]> wrote: > This is a message from the Museumpests List. > To post to this list send it as an email to [email protected] > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > > > Dear Dana, > > You should not be disappointed with your low temperature treatment. > I assume a record box is roughly 16 inches long, 12 inches wide and 10 > inches high. Your email indicates they were stacked as walls. I assume they > were stacked sides-abutting to make them more stable leaving a wall 16 > inches thick. With close packed organic, akin to bales of agricultural > product, your stack will have a time to thermal half change in about one > day+. 72F degrees is 21C. -15 F is -26C, more than adequate to kill pest > insects so not achieving -20F (-28C) is not a concern as -20C is quite > sufficient for a week. The fact you achieved -26C from 21C means you > dropped 47C in 4 days, about a time to half change of a day (remember the > frog jumping half down a log, then half again.. when does the frog jump off > the log puzzle). Were you at 5F at two days? if so you were pretty much > spot on what can be estimated from the chart I published in 1994, and is > available in the CCI TB29 and on our website (find "ten agents pests"). > Hold them at your -15F setpoint and you will have had an efficacious > treatment unless there was thermal bridging from the bottom of the van into > the base of the stack. If they were on pallets, and air circulated under, > all should be well. > > http://www.cci-icc.gc.ca/caringfor-prendresoindes/articles/10agents/chap06-eng.aspx > > Cheers, > Sincerely, > Tom Strang > > Canadian Conservation Institute | Institut canadien de conservation > Senior Conservation Scientist | Scientifique principal en conservation > Institut Canadien de Conservation | Canadian Conservation Institute > Ottawa, Ontario, Canada, K1A 0M5 > > [email protected] > Téléphone | Telephone 613-998-3721 (extension 239) > Télécopieur | Facsimile 613-998-4721 > Téléimprimeur (sans frais) 1-888-997-3123 | Teletypewriter (toll-free) > 1-888-997-3123 > > > > > > > From: dana senge <[email protected]> > To: [email protected] > Date: 03/10/2012 08:50 PM > Subject: [pestlist] Freezer Trucks > Sent by: [email protected] > > > > This is a message from the Museumpests List. > To post to this list send it as an email to [email protected] > To unsubscribe please look at the footer of this email. > ----------------------------------------------------------- > We recently tried using a freezer truck to process a large number of > boxes of archives. Record boxes were stacked in rows with 12" gaps > between the rows to allow for air circulation. We placed a datalogger > in the center of one of the boxes of archive materials (in the center > of the truck) and another outside the boxes to measure the temperature > of the air in the truck box. The results were surprising. > > We had been informed that the truck would go down to -20 degrees F in > 4 hours. Our data loggers showed that it took 10 hours for the air in > the truck to go from 44 degrees F to -15 degrees F, and the > temperature inside one of the record boxes took ~96 hours to drop from > 70 degrees to -15 degrees. (The boxes had been in a 72 degree > environment before being placed in the truck box). It appears that > the starting temperature of the boxes of paper was more difficult to > reduce than I expected. And the truck never achieved the desired > temperature. > > We are very disappointed in these initial results and are trying to > figure out if there is a different strategy for using a freezer > truck, or if this is just not feasible for freezing densely packed > materials, such as paper packed in a record box. We are discussing > packing boxes half full and packing the truck to allow for even more > air circulation. But it seems that getting to the goal of -20 degrees > F in 4 hours may not be feasible. > > Does anyone have any positive experiences working with a freezer truck > for processing a large quantity of materials? Especially dense > materials such as wood or boxes of paper? > > > Thanks, > > Dana Senge > Assistant Conservator > National Park Service > Intermountain Region Museum Services Program > Tucson, AZ 85745 > 520-791-6432 > [email protected] > > > ---------------------------------------------------------------------- > To send an email to the list, send your msg to [email protected] > > To unsubscribe from this list send an email to [email protected] and > in the subject put: > "unsubscribe" - no quotes please. > > You are receiving the Pestlist emails in standard mode. > To change to the DIGEST mode send an > email to [email protected] with this command in the body: > > set mode digest pestlist > > Any problems email [email protected] or [email protected] > > > > > > ---------------------------------------------------------------------- > To send an email to the list, send your msg to [email protected] > > To unsubscribe from this list send an email to [email protected] and > in the subject put: > "unsubscribe" - no quotes please. > > You are receiving the Pestlist emails in standard mode. > To change to the DIGEST mode send an > email to [email protected] with this command in the body: > > set mode digest pestlist > > Any problems email [email protected] or [email protected] > ---------------------------------------------------------------------- To send an email to the list, send your msg to [email protected] To unsubscribe from this list send an email to [email protected] and in the subject put: "unsubscribe" - no quotes please. You are receiving the Pestlist emails in standard mode. To change to the DIGEST mode send an email to [email protected] with this command in the body: set mode digest pestlist Any problems email [email protected] or [email protected]
