| Summary: | The important characteristics of Ballastic Black when mixing with Thinner was
identify from this research. Volume percentage method is one criterion to mix the
Ballastic Black and Thinner. The relevant properties are useful to estimate the efficiency
of the solar evacuated tube. The thin film thickness is relevant to the percentage of the
Ballastic Black. Besides, the surface roughness of each sample was measure by machine
Surftest Mitutoya SV400 and the surface distribution is test by Scanning Electron
Microscope (SEM). The absorptance and transmittance of different percentages of
Ballastic Black and Thinner was test by hit with different wavelength. Efficiencies of solar
useful heat gain can calculate by TRNSYS, SPF Report and Theoretical method.
Transmittance-absorptance product was calculated by multiply the transmittance
ratio of the uncoated sample into the absorptance ratio of the coated sample. This
transmittance-absorptance product is important to calculate the collector thermal
efficiency and the useful heat gain.
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