Radiative heat exchanger with diffuse reflection

Abstract

The present invention relates a radiative heat exchanger comprising a glass substrate having a first surface and a second opposite surface. The first surface is a radiative surface facing the sky, and the second surface is a coated surface, being provided with at least one metallic reflective layer, preferably aluminium and / or silver. The majority of the radiative surface has been roughened to provide a roughened zone having a Mean Width of the Profile Elements, Rsm, equal to or greater than 5µm (Rsm ≥ 5µm) and a Mean Height of the Profile Elements, Rc, equal to or greater than 0.05µm (Rc ≥ 0.05µm). Rsm and Rc measured on an evaluation length of 4.0 mm and with a Gaussian filter of which the cut-off wavelength is 0.8 mm.

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