On Aug 31, 11:15 pm, Richard J Kinch wrote:
ignator writes:
My point was that R. J. Kinch said "Brines or other fluid mediums
cannot work as well, because their temperatures rise as they absorb
heat"
And my response was that, the melting point of the brine or glycol
will result in a constant temperature until all of it is melted.

Listen: fluid mediums. They're not changing phase.

Ice directly against a cold plate works better than an ice/water bath. The
liquid water is merely adding thermal resistance to the heat transfer, not
sinking heat itself.

My understanding of the construction of the cold plate with phase
change storage media is refrigerant tube ways, conducting the heat
from the to metal (aluminum) with phase change storage media in the
same plate, as all the same structure, there is no air gap. This
plate is install in an insulated "ice chest" that has the door on top
to limit the cold air flowing out like a standard refrigerator.
Yup the plate is surrounded by air, and any thing in contact with it,
like a bag of ice. The idea is this plate has a long off cycle
between recharging (re-freezing the phase change energy storage media)
via the mechanical refrigerant system.
Like a refrigerator, you don't want some foods to be in direct contact
with the evaporator, unless you like frozen salads.
You don't want everything in the ice chest to be in good thermal
contact with this cold plate evaporator.
ignator