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OT Frozen contents in 12 Volt cooler Box
Agriv8 - 11/8/10 at 07:46 AM

Right I cant sus this - so thrown to the locust builders.

I have a 12v / 240v cooler box to tranport frozen food for a trip to france it will take 2 days to get to our destination.

So the cooler cools to 20 bellow ambient temp so lets say the ambient tempreature is 20 and the food inside is -5 is activating the cooling going to assist in keeping the food frozen longer or activly work against it .

the box is one of these :-

http://www.outwell.dk/Furniture.aspx?b=Outwell&bid=2&lid=1&l=en-GB&ProductId=1840&pid=9&CatId=523

PS even if the food defrost over the 2 day journey thats fine as it is all uncooked meats so no chance of cross contamination.

I just cant work out how these things work so an explanation of that may give me the answer I desire.

Thanks & regards

Agriv8


cliftyhanger - 11/8/10 at 07:49 AM

It means the temp inside the box will (should!) be zero. So it will defrost slower than left in a coolbox (I am assuming they dont circulate air inside the coolbox, as that may speed up defrosting....)


cliftyhanger - 11/8/10 at 07:50 AM

should add, fill up any exrta space with cartons of frozen fruit juice and bubblewrap. It all helps.


David Jenkins - 11/8/10 at 07:54 AM

They do have supermarkets in France, you know...


Dave Ashurst - 11/8/10 at 07:55 AM

Halfway down the linked page is probably the answer you're looking for...

How do absorption refrigerators work?: a concentrated ammonia solution is heated in a hermetic system and driven off as vapour. The pressurised ammonia gas is then liquefied in a condenser and supplied with hydrogen. As a result, it evaporates and, in the process, extracts heat from the food storage space. The ammonia gas then enters the absorber where it is reabsorbed in a weak solution of ammonia. Finally, the saturated solution flows back to the boiler where the whole cycle starts again. The boiler can be powered by either gas, 12 or 230 volts.


Dave Ashurst - 11/8/10 at 07:56 AM

.... or was that the question?


Dave Ashurst - 11/8/10 at 07:57 AM

quote:
Originally posted by David Jenkins
They do have supermarkets in France, you know...



snigger snigger


mangogrooveworkshop - 11/8/10 at 07:59 AM

The customs will take meat off of you if they search. Mad cow maggie saw to this making johny foriegner rather nervous about the movement of such stuff.....

But why take crappy meat from tescos to a country that has fantastic fresh food.

Just like I cant understand why scotland imports water from the south of france

I always try whats local when traveling.
It adds to the experiance. Besides theres a lidls in almost every village in europe if you get really hungry


cliftyhanger - 11/8/10 at 08:03 AM

But the French don't do (proper) bacon
Apart from that, teabags and maybe baked beans.......and some decent beer, although their jenlain ambree is very good.


Nick Skidmore - 11/8/10 at 08:13 AM

I think its a peltier system. This is a blend of semiconductor type materials that when polarised one way will cool and when polarised the opposite will warm. They use about 4A if I remember correctly so can flatten batteries quite quickly.


Dave Ashurst - 11/8/10 at 08:39 AM

quote:
Originally posted by Nick Skidmore
I think its a peltier system. This is a blend of semiconductor type materials that when polarised one way will cool and when polarised the opposite will warm. They use about 4A if I remember correctly so can flatten batteries quite quickly.



Yes, I think you're right, its more likely to be a solid state system.


02GF74 - 11/8/10 at 09:14 AM

has to be peltier ..... not very efficient or effective but expensive from what I recall on land rover forum.


Mark Allanson - 11/8/10 at 09:17 AM

quote:
Originally posted by mangogrooveworkshop
The customs will take meat off of you if they search. Mad cow maggie saw to this making johny foriegner rather nervous about the movement of such stuff.....

But why take crappy meat from tescos to a country that has fantastic fresh food.

Just like I cant understand why scotland imports water from the south of france

I always try whats local when traveling.
It adds to the experiance. Besides theres a lidls in almost every village in europe if you get really hungry



When was the last time you saw a scotsman drinking water!


Agriv8 - 11/8/10 at 09:29 AM

Thanks Chaps I will research Pelter system seemed to work with some items left in over night which it chilled niceley. The box cost aprox £40 from go camping.

the meat was from a 'farmer freind' who slaugters some of prize calf bulls and sells the meat to freinds and familly. This is meat that is bread for taste and texture not what 'Looks Good' on the tesco slab we will buy fresh while over there but beef I will be taking is bread for specialist slauter houses rather than suppermarkets .

thanks for the heads up re customs The Box will be Covered in the boot and unplugged while the engine not running.


David Jenkins - 11/8/10 at 09:09 PM

You could also get some of those plastic coolbox 'bricks' - shove them in the home freezer until they're well frozen, then pack them around the meat in the car's fridge. They 'keep their cold' for a surprisingly long time (i.e. it takes a lot of heat energy to thaw them).