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InvisibleJaComet
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Registered: 11/12/02
Posts: 347
Loc: Out Yonder
How To Freezer Dry
    #1264202 - 01/31/03 04:50 AM (14 years, 4 months ago)

Greetings all,

Freezer drying is possible. Basically its: frost-free unit + high temp = drying environment. Here's why and how.

1) Water expands when it freezes rupturing cell walls of plant materials as ice crystals form.

2) A calorie is a unit of measure of  heat exchange/transfer. It takes 1 calorie of transfer to raise or lower 1 gram (ml / cc) of water 1 degree Celsius. It takes 10 (Ed:correction from 80) calories of transfer to form ice. Because of this property still water can be at or below freezing point with out icing unless disturbed or seeded with a little ice.

3) A frost-free freezer operates by maintaining the chamber as dry as possible. To keep frost down the unit will heat its walls on occasion to melt any light frost and a fan agitates the warmish air to defrost other surfaces.

To freezer dry, use a good thermometer and set the lowest temp within a degree ( C )or two ( F ) of the freezing point. Be certain specimens to be dried are absent surface moisture. Place mushrooms or herbs on racks or screens to allow air flow. Dehydration is usually very complete in 12 or more hours depending on size of load.

What I think happens is specimens begin to dry as usual, maintaining intracellular equilibrium with internal water wicking its way to the dryer outer surface. The relatively high temperature precludes a rapid enough 10 calorie exchange to form ice internally and if ice should form on the surface it does little or no damage.

Freezer dried specimens retain color and flavors much nicer. Mushrooms maintain a little more size for weight than heat dried, however your ice-cream will get really soft.

Peace

"Science?! * * * What my Wizard does not know does not exist."
Giant King - GULLIVER'S TRAVELS


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Edited by JaComet (08/29/09 09:41 AM)


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Offlinefredthetree
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Re: How To Freezer Dry [Re: JaComet]
    #1264208 - 01/31/03 04:54 AM (14 years, 4 months ago)

thanks for the info! :smile: 


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Offlinekykeon
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Re: How To Freezer Dry [Re: JaComet]
    #1264233 - 01/31/03 05:14 AM (14 years, 4 months ago)

i think i will give it a try with two-three shroomiez tonite. :smile:

thanx for the info


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Offlinedebianlinux
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Re: How To Freezer Dry [Re: JaComet]
    #1264414 - 01/31/03 06:47 AM (14 years, 4 months ago)

interesting read. i knew all the stuff about calories but you lost me on this one:
Quote:

It takes 80 calories of transfer to form ice. Because of this property still water can be at or below freezing point with out icing unless disturbed or seeded with a little ice.



can you explain that a bit more thouroughly? (calories work up the same as they do down, so i have to assume we are talking about some sort of vacuum with no other source of "heat" or something) i mean really, that makes no sense to me.


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Anonymous

Re: How To Freezer Dry [Re: JaComet]
    #1264456 - 01/31/03 07:04 AM (14 years, 4 months ago)

Excellent, sounds useful.


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InvisibleJaComet
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Re: How To Freezer Dry [Re: debianlinux]
    #1264661 - 01/31/03 08:11 AM (14 years, 4 months ago)

Debianlinux,

I don't know that I can adequately explain this phenomenon except it has to do with water's unique molecular energy and latent heat of crystallization. ( DEF: The amount of heat that must be removed from one gram of a liquid at its freezing point to freeze it with no change in temperature )

< http://whyfiles.org/071questions/4.html > has a graph of the process.


A page at < http://www.physics.ncsu.edu/pira/therm.html > mentions this class demonstration.

"Water in a small test tube is cooled to -4 C by placing in a dry ice/alcohol bath. Shake to freeze and the temperature will rise to 0 C."

Water's weird. Go Figgure.

Kykeon, Be sure to stabilize your freezers temp with a thermometer at just at or below freezing, otherwise you will be disappointed.

Peace


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OfflineBikeCourier
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Re: How To Freezer Dry [Re: JaComet]
    #1264682 - 01/31/03 08:19 AM (14 years, 4 months ago)

What is the rH in the freezer, ie can it be done outside with temp about -2c and humidity about 60%


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tanstaafl (or maybe there is)


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InvisibleJaComet
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Registered: 11/12/02
Posts: 347
Loc: Out Yonder
Re: How To Freezer Dry [Re: BikeCourier]
    #1265557 - 01/31/03 12:31 PM (14 years, 4 months ago)

BikeCourier,

Humidity is reported to be around 55 to 65% at zero degrees F. Slightly higher during defrost cycle.

Your idea might just work with a little breeze.

Peace

PS : No idea what rH would be at 30 degrees F.


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Edited by JaComet (01/31/03 12:33 PM)


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Offlinedebianlinux
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Re: How To Freezer Dry [Re: JaComet]
    #1265743 - 01/31/03 01:42 PM (14 years, 4 months ago)

ok, i got it. makes perfect sense. it's the same phase transition concept as water turning into steam just in reverse. not weird at all. it was your original wording that was throwing me.

edit: the 80 calories is abit incorrect as you said it yourself, a calorie is the energy "expended" in raising/lowering 1ml water 1deg celsius. now, if said water were above 80 degrees celsius it would take more than 80 calories to "freeze" it.


Edited by debianlinux (01/31/03 01:44 PM)


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