The commonly used cold insulation materials include magnesium carbonate, glass wool, pearlescent sand, and slag cotton, and their characteristics are shown in the table below:
|
Name, brand |
volume, mass /kg·m-3 |
thermal conductivity /W(m·K)-1 |
specific heat capacity/ kJ(kg·K)-1 |
Other characteristics |
|
|
Magnesium carbonate |
400 130 |
0.05～0.07 0.03～0.04 |
1.00 1.00 |
requires a moisture content not greater than2.5%
|
|
|
Glass wool |
130 |
0.047 |
0.84 |
diameter3～30μm |
|
|
Expanded perlite (Pearlescent sand) |
≤80(Grade1) 150(Grade2) |
0.04～0.058 0.04～0.05 |
0.67 0.84 |
grain size below1mm以下90%；1～2mmgrain size below10%； Moisture content not greater than0.5% |
|
|
mine residue Cotton |
100 150 200 |
≤100 ≤150 ≤200 |
0.044 0.038～0.047 0.033～0.052 |
0.75 0.84 0.84 |
Moisture content not exceeding2%
|
Due to its light weight, good cold insulation performance, lower price, good fluidity, and ease of filling, pearlite sand is currently mainly used as a cold insulation material in equipment. A layer of slag wool can be installed at the bottom of the box, and slag wool or glass wool should also be installed in local compartments that often require maintenance.
