Gallery, Projects and General > The Design Shop

Ice cream mobile freezer

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RodW:
Freezers are usually set to -15 degrees will easilly last 3 to 4 hours without opening. Years ago, faced with a house relocation of 700 km, i bought some dry ice and whacked in the top of my chest freezer. I never did it again despite doing similar moves. Just exclude the air with crumpled newspaper.

Agreed however dry ice is the way to go and it won't matter what the container is as it is -196 ○C. But I do remember the old canvas icecream bags packed with dry ice when we had Christmas tree events with no power 90 miles from town as a kid in the 70s. Alternatively, look for a 12 volt Danfoss comlressor and add a car battery to power it.

RussellT:
I agree the key to this is good insulation but I've had a couple of thoughts that no one's mentioned so I thought I'd throw them into the melting pot to confuse the issue.

At school dry ice was made by discharging a CO2 fire extinguisher into a canvas bag - probably an expensive way to get it but would give the possibility of recharging.

Caravan fridges have freezer boxes and are gas powered and are quite cheap secondhand.  Could you build your box around the works?

Russell

tom osselton:
Co2 fire extinguisher works well on beer too!  :beer:

raynerd:
Hi guys, I work in a science department and we do discharge a co2 cylinder with a special cap in it to make dry ice. Takes about half the co2 cylinder to make a pellet and is not economical. Cheapest dry ice supplier is £25 (for way too much). You can't store it and having to preorder each day before you went out wouldn't work either. Although it may be the best freezing solution, I don't think its a practical or economical one. Interesting replies...keen to hear more.

Bluechip:
Hmmmmm

Got a Street Traders License ??

Got a Food Hygiene Certificate ???

Had your Food Preparation Facilities inspected and approved ??

You MAY need them ...  :scratch:

I don't think it applies for fresh fruit / veg. so radishes on a cocktail stick may well be OK.

DAMHIK.

Dave

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