Thermal conductivity of foam glass at low temperatures
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Question: What is the thermal conductivity of foam glass at -192 degrees? For a DN40 pipe, what would be the appropriate insulation thickness when using foam glass for insulation? Thank you
The process manual specifies only -101 degrees; for lower temperatures, it is necessary to consult the manufacturer.
It is best to consult the manufacturer.
The insulation thickness of foam glass for pipes is much greater than that of PIR or PU, and the material cost is also much higher. For insulation of pipes, low-strength foam glass is sufficient; its thermal conductivity at 10 degrees Celsius is 0.043 W/m·K. As for the thermal conductivity at -196 degrees Celsius, one can refer to the standards ASTM C-552 and CINI 2.9.01. In China, equation for thermal conductivity is provided in Appendix G of JC-T647 for reference. This standard recommends the following equation for the thermal conductivity of foam glass insulation products of grades 150 and 180: λ = λ35 + 0.000192(i – 35), where λ represents the thermal conductivity of the foam glass insulation product at a certain temperature, in W/(m·K) ； λ35 —— Thermal conductivity of foam glass insulation products at 35°C, W/(m•K) ； i —— the average temperature of the foam glass insulation product, in °C.