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- W56124928 abstract "An automated guarded-hot-plate apparatus was designed and built to meet the requirements of ASTM Standard Test Method C-177 for measuring the thermal conductance of thermal insulation. Apparent thermal conductivity was measured with this apparatus in the range from 40 to 100 mW/(m.K) at mean temperatures from 300 to 750 K, in environments of air and helium, at pressures ranging from atmospheric pressure to roughing-pump vacuum. The apparatus is controlled by a desk-top computer. A thermocouple device of novel design more accurately senses the average temperature over the surface of each heater plate. An improved algorithm for the control sequence leads to more-stable heater powers and specimen temperatures. Overall uncertainties of apparent thermal conductivities at atmospheric pressure are 2% at 300 K and 5% at 750 K when measuring conductivities in the range from 40 to 100 mW/(m.K). The apparatus will be valuable in development of new Standard Reference Materials of low conductivity and for higher-temperature ranges, and is being used in comparative interlaboratory measurement programs." @default.
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- W56124928 date "1988-01-01" @default.
- W56124928 modified "2023-10-01" @default.
- W56124928 title "An automated high-temperature guarded-hot-plate apparatus for measuring apparent thermal conductivity" @default.
- W56124928 doi "https://doi.org/10.6028/nbs.ir.88-3089" @default.
- W56124928 hasPublicationYear "1988" @default.
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