Honeycomb structures are a well known device to reduce convective and radiative heat losses in solar thermal flat-plate collectors, thus improving their efficiency at high temperature and/or low irradiance (Hollands, 1965). Despite several investigations of the last decades no suitable material has been found so far which can provide for the requested high performance and durability at reasonable costs. A commercially available modified cellulose triacetate film, already in use assembled in honeycomb compounds as transparent insulation, exhibits promising properties.
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