2002 volume 34(2)
doi:10.1068/htwu286

Cite as:
Weinläder H, Pottler K, Beck A, Fricke J, 2002, "Angular-dependent measurements of the thermal radiation of the sky" High Temperatures - High Pressures 34(2) 185 – 192

Angular-dependent measurements of the thermal radiation of the sky

Helmut Weinläder, Klaus Pottler, Andreas Beck, Jochen Fricke

Received 04 August 2000

Abstract. Measurements were carried out to determine the incoming longwave radiation of the sky as a function of the zenith angle at the ZAE Bayern in Würzburg. The obtained data allowed the adjustment of an existing model to regional climatic conditions. This model was used to compute the thermal heat losses for various buildings with respect to variations of the emissivities of outer wall surfaces as well as their orientation. Condensation of water vapour was also taken into account. It was found that the application of wall paints with emissivities of e = 0.5 instead of normal paints (e ~= 0.9) would reduce the thermal heat losses by about 5% - 25%. Poorly insulated buildings and south-facing walls show the greatest energy savings.

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