Hi Anybody interested in using silver as a food safe container material with excellent thermal conduction properties. Also has interesting anti microbial properties. Big drawback is cost of material. Sheffield plate was the ideal material, a silver layer forge bonded onto a copper base layer and rolled out into usable thicknesses for fabricating into utensils. Don't know if anyone makes it anymore. On Thu, Feb 21, 2013 at 9:36 PM, John Ferrell wrot= e: > In more primitive times there was a pitcher available that had a > "pocket" that extended from the outside to the inside that one could put > ice water in (or ice if you could get it) that would chill your drink > without diluting it. > When steel cans with solder joints were the norm they were coated inside > with varnish. Grocers discounted bent cans to move them quick since > internal coating damage was certain. A can of tomatoes that had a little > age tasted metallic anyway. Watch out for cans with bulging ends. > If you also remember any of these things you qualify as an Old Timer! > > > On 2/21/2013 5:18 PM, veegee wrote: > > Hi all, > > > > I will be using a thermoelectric element to keep the drink in my 1L > > water jug cool. The fluid can be anything including water, iced tea, > > carbonated drinks, etc. The water jug itself looks similar to this: > > > > > http://i01.i.aliimg.com/photo/v0/358876273/High_quality_glass_jug_with_li= d_water.jpg > > > > The cooling mechanism is as follows: a thermoelectric cooler will sit o= n > > the top of the jug, in place of the cap, with the hot side facing up. A > > heat sink (probaby aluminum, doesn't really matter) and fan will be > > attached to the hot side. > > > > On the cool side, some kind of heat sink will extend into the jug and > > will be in direct contact with the fluid which it will cool. My questio= n > > is: what type of heat sink is safe for this purpose? > > > > Copper is used in plumbing, so I initially thought of a solid copper CP= U > > heat sink of some sort. I could also potentially solder or weld a bunch > > of long, thin copper pipes to a copper plate. The pipes would extend > > into the jug to cool the fluid. Doesn't need to be very efficient, just > > enough to *keep* a drink cool, as opposed to cooling something quickly. > > I'm not sure how suitable copper is when in contact with acidic drinks > > though. > > > > I have a bunch of aluminum heat sinks, but I'm not sure how safe they > > are for this purpose. I'm concerned with too much metal leeching into > > the fluid. Apparently, drink cans are made of aluminum, and can contain > > many different types of fluids including acidic beverages. But I'm stil= l > > not sure... > > > > Ceramic sounds pretty safe, but I'm not sure what to look for here. > > > > Any tips? > > -- > John Ferrell W8CCW > That which can be destroyed by the truth should be. > P.C. HODGELL > > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .