Refrigerating gel

Refrigerating gel

Refrigerating liquid

The refrigerating liquid is a eutectic solution made of water and mineral salts. The quality and concentration of these mineral salts can vary in order to modify the water freezing point.
Water gets solid by freezing at or below 0°C. A eutectic solution with a freezing point at -21°C gets solid at or below -21°C.
Freezing point and released temperature are closely related : a eutectic device at -21°C releases a negative cold at -18°C when frozen pure water releases cold at +2°C.
The refrigerating liquid is contained in eutectic plates, more commonly called refrigerating ‘packs’.


Refrigerating gel

Slimy agents are often added to the eutectic liquid, which gives the liquid a more doughy consistency. This is called refrigerating gel (also called, sometimes, ice pack).
The gel allows to blend the eutectic solution : the salts are well distributed into the liquid and the concentration is homogeneous.
Using gel forms allows to improve the stage defreezing time -the time during which the gel will aborb heat-, and the temperature released is more stable.

Single use refrigerating gel

The viscosity of refrigerating gels (also called ice pack) can vary a lot. A thicker gel is generally used for single use flexible cooling packs. Viscosity brings sturdiness and dimensional steadyness to the flexible pack. A « pulpy » and colored refrigerating pack is more pleasant.

Reusable refrigerating gel

The reusable cold accumulators have a rigid envelope. The refrigerating gel’s viscosity does not need to be as high in that case: robustness is insured by that rigid external wrapper.
The envelope dimensions are calculated for an optimization of the heat exchange surface of the cooling gel.
Bridging points are reserved into the eutectic plate wrapper in order to improve thermal exchange and the convection power of the ice packs.