Application of Pulse Current Electrolysis to the Large Scale of Copper and Aluminium Substrates for Solar Selective Coatings on Solar Collectors

실 규모 태양열 집열판 제작을 위한 구리 및 알루미늄 기판에의 태양광 선택흡수박막 전착;Pulse Current Electrolysis 적용

  • 이태규 (한국에너지기술연구소 태양에너지응용연구팀) ;
  • 김동형 (한국에너지기술연구소 태양에너지응용연구팀) ;
  • 김형택 (아주대학교 에너지학과) ;
  • 여운택 (삼진 정공 주식회사)
  • Published : 1996.09.01

Abstract

It is one of the most important factors to enhance the efficiency of the solar collectors by in-creasing collecting efficiency and decreasing heat loss. The pulse electrodeposition method has been involved in this study to improve characteristics of the solar selective coating on 230cm${\times}$60cm substrates and electrical efficiency of the process. The composition of the electrolyte was 280 g/$\ell$ chromic acid, 15 g/$\ell$ propionic acid, and 10 g/$\ell$ appropriate additive. 230cm${\times}$60cm copper and aluminium sheets were utilized as the substrates. It has been observed that the black chrome coatings exhibited reasonable optical properties for commercialization when the plating parameters were properly controlled; the absorptance was 0.98 and 0.97 and omittance was 0.17 and 0.23 for copper and aluminium substrate, respectively. This study implies that the pulse current electrolysis method could be applied to the large scale substrates, and the various products can be avilable after the consideration of the thermal conductivity, heat transfer efficiency and cost problems of the substrates.

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