Why is there a large difference between the designed and actual insulation values for the main steam valve of a turbine?
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Recently, I visited a power plant where the insulation material used for its main steam valve was aluminum silicate with a thermal resistance of 260. The designed temperature difference should have been around 15 degrees Celsius, but the actual surface temperature was 80 degrees Celsius, resulting in a temperature difference of 40 degrees Celsius. Could the sea friends explain it? Many studies indicate that a temperature difference of 40 degrees Celsius is normal.
Is a surface temperature of 80 degrees Celsius still normal? If the greenhouse is correct, what about heat protection? The design takes both heat insulation and scald protection into account; as a result of the actual insulation, the outer surface temperature does not exceed 50 degrees.