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Ice cream mobile freezer
David Jupp:
Another low tech approach is to use ice sprinkled with salt - salt reduces the melting point, the latent heat of fusion has to be supplied from somewhere (by pulling heat from the surroundings) - this results in a temperature drop.
Might be OK if you can get hold of plenty of ice. I think I might want to include a small drain in the bottom of the box if using this approach.
[Edited for silly error]
awemawson:
http://www.dryiceuk.com/ (Next day delivery)
http://www.green-gases.com/ (On line purchasing)
vtsteam:
I quess we didn't know what was meant by eutectic plates! :doh: :lol:
We use similar packs for keeping food cool (but not frozen), and the ice cream maker uses a freezable metal liner/container that is similar to freeze ice cream. Older ice cream makers used the salt and ice method, but that does depend on melting the ice to create the cold temps, so must have a drain and ice additions over time.
I do wonder if any of these will be enough to maintain frozen ice cream over the time reguired. But ye never know til ye try!
I aways like to do a small scale experiment first in this type of thing, to get an estimate for how to build the real thing. It's usually cheaper by far, quick to do, and quantifies things. Plus it's fun.....
Noitoen:
35 years ago, in South Africa, dry ice was also the method. We used to buy ice cream in the afternoon and beg the vendor for some bits of ice for experiments. Exploding plastic Coke bottles was our favourite pastime :clap:
nrml:
How about going low-tech and using a polystyrene foam box and frozen hot water bottles (is that an oxymoron? :scratch:) as ice packs? They are water tight (no drainage problems like with ice blocks), elastic enough to allow expansion while freezing, come in a variety of sizes and above all are cheap. You can even flog them off on ebay when you are done with them.
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