Need to do a low-temperature equipment, the temperature inside the box to minus 70 degrees, the insulation layer of 100 mm, what is the insulation layer of material for good insulation? Check with polyurethane PU foam is better, but more expensive. With glass fiber cotton insulation afraid of a long time the insulation layer will have condensate and damage the insulation effect, but look at other foreign similar equipment are used glass fiber cotton insulation, may I ask, in the end can use this material to low temperature insulation? There are detailed technical information that I add another 100 points, thank you!
No, extruded board long-term safe temperature at 70 degrees, extreme temperature at 90 degrees.
Extruded board can not, PU can not, more than 180 degrees will be broken down.
You only said the original low temperature, did not say high temperature.
180 degrees or more of course can only use glass wool, and no other material optional.
You are not afraid to spend money, you can consider the airgel try.
Minus 70 degrees and the outside world temperature will reach eight degrees. Heat exchange will be very powerful, even with 100 mm insulation layer, has been very reluctant to the bar.
Is definitely the choice of the lowest thermal conductivity of the material.
Preferred is the PU, the thermal conductivity can be as low as 0.026.
Does not recommend fiberglass, his heat conduction at 0.036. And after the increase in thermal conductivity coefficient will be more powerful.
If you consider the cost, you can use XPS. Good XPS heat conduction at 0.028.
If you do not consider the cost, you can consider the PU plus vacuum insulation board. The thermal resistance will be very high, its thermal conductivity is 0.004
Your equipment temperature is zero, you should find cold material! Polyurethane is insulation material! Do not mix the concept!
Like you said glass wool easy to absorb water and low temperature equipment easy to sweat glass wool will affect the heat insulation effect it is generally used for high temperature equipment insulation you can consider the polyethylene insulation material closed foam low water absorption is more suitable for low temperature equipment With the cost of low and then a little better can be used rubber and plastic insulation materials, the high cost but the insulation effect is better and the fire in fact low-temperature equipment or polyurethane spray insulation effect is the best general cold storage is that I do the distribution of insulation materials according to me Years of experience to give you suggestions for your reference only
