Apparent thermal conductivity of evacuated SiO2-aerogel tiles under variation of radiative boundary conditions
作者： P. Scheuerpflug , R. Caps , D. Büttner , J. Fricke
DOI: 10.1016/0017-9310(85)90048-1
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摘要: Abstract The apparent thermal conductivity λ of evacuated SiO 2 -aerogel tiles was measured with our small guarded hot plate vacuum system LOLA II. In order to study the influence boundary emissivity on plates (20 × 20 cm ) were either used their plasma-sprayed surfaces ( e ≈ 0.5) or low-emissivity aluminum 0.05) foils as covers. difference in already showed at room temperature and rose about 50% for radiative temperatures T r = 570 K . An important consequence is that superinsulating systems should always be provided boundaries around aerogel. calorimetric results are compared values derived from spectral i.r. transmission measurements.
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