Optimization of parameters of spray coating processes for the thermal solar absorbing film

Ming Yu Liu, Zong Han Wu, Keh Chin Chang, Muh Rong Wang

Research output: Contribution to conferencePaperpeer-review

Abstract

This paper investigates the optimization conditions of the parameters of a reciprocating spray coating processes to improve the uniformity of absorptivity and emissivity distributions on a selective absorbing film. The characteristics of the absorbing film play a key role in determining the collection efficiency of solar thermal energy. The absorptivity (α) and emissivity (ε) of the thickness sensitive spectrally selective (TSSS) are very sensitive to the thickness of the film; both increase as its thickness is increased. According to the results of the literature, the solar heater with a TSSS film of thickness of approximately 3 ± 1 μm could achieve the highest temperature under the same sun radiation conditions. This research used the Taguchi method with four control factors include (1) pressure of gas/liquid (Pa/Pl), (2) injection height, (3) ratio of concentration of paint and solvent, and (4) moving speed of the nozzle. The quality of the spray coating processes is measured by absorptivity and emissivity of the TSSS in this research. The optimal combination of L9(36) orthogonal array is gas/liquid pressure of 2.5/0.8 kgf / cm2 , 28cm for height, 0.5 for the ratio of concentration of paint and solvent, and 29.57 cm/ s for moving speed of nozzle. It turns out that the quality characteristics for the ratio of absorptivity and emissivity is increased from 1.165 to 1.368, and the S/N ratio of absorptivity is decreased from 60.01 dB to 39.31 dB, as comparing the confirmation and original tests. It show that reduce the thickness of the film and upgrade the uniformity successfully.

Original languageEnglish
Publication statusPublished - 2015
Event13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015 - Tainan, Taiwan
Duration: 2015 Aug 232015 Aug 27

Conference

Conference13th International Conference on Liquid Atomization and Spray Systems, ICLASS 2015
CountryTaiwan
CityTainan
Period15-08-2315-08-27

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

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