-80C Walk-in Cold Room
-80C Walk-in Cold Room
(OP)
We are in the process of setting up a -800C cold room for product storage. The product (95% water) is stored in 20 liter plastic bags. Bag durability is under test now. The product can't tolerate exposure to -200C for longer periods. The product is to be cooled from +4 to -400C in not more than 4 hours time. We also have plans to have a blast freezer for this reason.
The incremental load is 100 kgs per day and the total load for which cold room is designed is 9000 kgs. The room size is 8.5mx5mx2.7m ht or it will be split into two. I have been using CalcRite and Dossat for cold room design so far, but there is nothing about -800C in either of the references. This is first time for me to work on this cold room. I appreciate if I can get any inputs, suggestions and leads.
Thanks,
The incremental load is 100 kgs per day and the total load for which cold room is designed is 9000 kgs. The room size is 8.5mx5mx2.7m ht or it will be split into two. I have been using CalcRite and Dossat for cold room design so far, but there is nothing about -800C in either of the references. This is first time for me to work on this cold room. I appreciate if I can get any inputs, suggestions and leads.
Thanks,





RE: -80C Walk-in Cold Room
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: -80C Walk-in Cold Room
We are planning for a cascade system with R23 in second stage. The boiling point is -840C at atmospheric pressure, so evaporating pressure is slighty negative.
RE: -80C Walk-in Cold Room
http://en.wikipedia.org/wiki/Trifluoromethane
and so does Liquid Air:
http://enc
That would seem a bit tight to have only a couple of degrees margin. You may need to use extremely good insulation, or at least, run the R-23 at a pretty high volume through the system.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: -80C Walk-in Cold Room
RE: -80C Walk-in Cold Room
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: -80C Walk-in Cold Room
RE: -80C Walk-in Cold Room
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: -80C Walk-in Cold Room
Everything else freezes, lungs remain OK at -50C (that's as cold as I've experienced personally).
RE: -80C Walk-in Cold Room
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: -80C Walk-in Cold Room
Don't kid yourself that there is going to be a cheap and energy-efficient way to accomplish this kind of cooling.
RE: -80C Walk-in Cold Room
No, I don't. This requirement is part of a bigger scheme, which requires another complicated process and its validation, if I have to go with LN2 system.
I did work out on revenue expenditure with -80C cold room with efficiencies running at single digit. Nevertheless, this seems to be the option. Anyhow, thanks for the warning.
To all,
Thanks for the inputs. I came to know about couple of installations of this kind in US (for which I am going to get help from one of my counterparts) and also ready made containers from MAERSK on lease basis (this seems to be a part of side business for them). Will update once the things are finalised.