Issue 4/2022 - New green refrigeration technology gets new ideas

New green refrigeration technology has gained new ideas

Recently, the team of the Institute of Solid State of Hefei Research Institute of the Chinese Academy of Sciences proposed the innovative idea of "realizing the refrigeration effect through hydrostatic pressure driving fluid-solid phase transition" (liquid-solid), obtaining the room temperature Pompang pressure card effect in the normal paraffin system, opening up new ideas
for the development of green environmental protection new refrigeration technology.

Solid-state phase change refrigeration materials rapidly respond to heat under the drive of external fields such as magnetic fields and electric fields, that is, the thermal effect
of solid-state phase change.
This effect absorbs and releases heat from the surrounding environment, using the endothermic process to produce a cooling effect
.
These materials have minimal environmental impact, but their refrigeration performance is difficult to match with conventional gas refrigerants, which hinders their practical application
.

Inspired by the characteristics of liquid-solid phase transition, the research team proposed for the first time the idea of using pressure to drive liquid-solid phase transition to achieve the Pompeoka effect, and found the low-pressure-driven Pompanka effect
in normal paraffins.

It has been found that whether it is solid or liquid, hydrostatic pressure can be formed inside the normal paraffin when pressure is applied, avoiding the addition of pressure transfer medium when used, so it can improve the cooling density and facilitate the miniaturization of
refrigeration equipment.
In addition, n-paraffins are low cost, stable physicochemical properties, reversible phase transition processes and no harmful emissions
.
In short, n-paraffin materials have broad application prospects
in the field of phase change refrigeration.