Value of thermal conductivity for insulation materials
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When determining the thermal conductivity of insulation material, it is necessary to know the average temperature of the insulating layer; however, the surface temperature outside the insulating layer is unknown. How should this value be determined? Just use the ambient temperature?
Assume 20 degrees first, then make corrections by calculating the outer surface temperature, and perform multiple fittings to arrive at the result. If you find it troublesome, it’s safer to simply use tm as the pipe temperature; the resulting value will not differ much anyway
Should TM be used as the pipe temperature? Does it refer to the temperature of the inner surface of the insulation layer? Won’t the TM value be much higher when the pipeline is at high temperature?
There will be a bit more; if you’re aiming for accuracy, use my first method for the calculation.