What is vacuum powder insulation?
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What is vacuum powder insulation?
Vacuum powder insulation is an insulating material that combines vacuum technology with powder materials. The principle involves creating a vacuum between two thin-walled containers and filling them with a special powder material, which greatly reduces heat transfer through gas conduction, convection, and radiation, thereby achieving excellent insulation effects. Commonly found in water heaters, cold storage, and other fields. .
Vacuum powder is pearlescent sand, a material commonly used for insulation in cryogenic containers
A powder material of certain density and particle size (usually perlite) is filled into the adiabatic layer, thereby achieving better insulation at lower vacuum levels. Due to the shielding and radiation effects of vacuum powder, heat conduction through gases is also reduced, resulting in better thermal insulation properties than those of ordinary insulators or high-vacuum insulators. To maintain a vacuum over the long term, a certain amount of adsorbent is placed inside the interlayer. Vacuum powder insulation is widely used in medium-sized storage tanks for liquid oxygen, liquid nitrogen, and liquid argon