ASTM E434-10(2020)

Annotation of standard text ASTM E434-10(2020) :

This test method covers measurement techniques for calorimetrically determining the ratio of solar absorptance to hemispherical emittance using a steady-state method, and for calorimetrically determining the total hemispherical emittance using a transient technique. The main elements of the apparatus include a vacuum system, a cold shroud within the vacuum chamber, instrumentation for temperature measurement, and a solar simulator. Any type of coating may be tested by this test method provided its structure remains stable in vacuum over the temperature range of interest. The substrate shall be machined from flat stock and to a size proportioned to the working area of the chamber.


Keywords:
calorimetry, emittance, infrared emittance, material radiative property, radiative heat transfer, solar absorptance, spacecraft thermal control, spectral normal emittance, thermal radiation ,, ICS Number Code 27.160 (Solar energy engineering)