태양열 집열기에 사용될 선택흡수막의 성능 평가
Performance Evaluation of Selective Coatings for Solar Thermal Collectors
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초록
Metal-metal oxide (M-M oxide) cermet solar selective coatings with a double cermet layer film structure were deposited on the Al-deposited glass substrate by using a directed current (DC) magnetron sputtering technology. M oxide (CrO and ZrO) was used as the ceramic component in the cermets, and Cr and Zr used as the metallic components. In addition, black Cr (Cr-Cr2O3 cermet) solar selective coatings were deposited on the Ni-plated Cu substrate by using a electroplating method for comparision. The thermal stability tests were carried out for performance evaluation of solar coatings. Reflectance measurements were used to evaluate both solar absorptance (α) and thermal emittance (∈ ) of the solar coatings before and after thermal testing by using a spectrometer. Optical properties of optmized cermet solar coatings were α ≃0.94-0.96 and ∈ ≃0.1 (100 0C). The results of thermal stability test of M-M oxide solar coatings showed that the Cr-CrO cermet solar selective coatings were more stable than the Zr-ZrO cermet selective coatings at temperature of both 400 0C in air and 450 0C in vacuum. The black Cr solar selective coatings were degraded in air at temperature of 400 0C. The main optical degradation modes of these coatings were diffusion of metal atoms, and oxidation.
Abstract
Metal-metal oxide (M-M oxide) cermet solar selective coatings with a double cermet layer film structure were deposited on the Al-deposited glass substrate by using a directed current (DC) magnetron sputtering technology. M oxide (CrO and ZrO) was used as the ceramic component in the cermets, and Cr and Zr used as the metallic components. In addition, black Cr (Cr-Cr2O3 cermet) solar selective coatings were deposited on the Ni-plated Cu substrate by using a electroplating method for comparision. The thermal stability tests were carried out for performance evaluation of solar coatings. Reflectance measurements were used to evaluate both solar absorptance (α) and thermal emittance (∈ ) of the solar coatings before and after thermal testing by using a spectrometer. Optical properties of optmized cermet solar coatings were α ≃0.94-0.96 and ∈ ≃0.1 (100 0C). The results of thermal stability test of M-M oxide solar coatings showed that the Cr-CrO cermet solar selective coatings were more stable than the Zr-ZrO cermet selective coatings at temperature of both 400 0C in air and 450 0C in vacuum. The black Cr solar selective coatings were degraded in air at temperature of 400 0C. The main optical degradation modes of these coatings were diffusion of metal atoms, and oxidation.
참고문헌 (14)
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