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KMID : 1024520190280050521
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Journal of the Environmental Sciences
2019 Volume.28 No. 5 p.521 ~ p.526
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Evaluating Solar Light Collectors for Use in Closed Plant Production Systems
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Lee Sang-Gyu
Lee Jae-Su
Lee Hyun-Dong
Baek Jeong-Hyun
Rho Si-Young
Hong Young-Sin
Park Jong-Won
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Abstract
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In this study, a solar light collector that collects and transmits solar light required for crop production in a closed plant production system was developed. The solar light collector consisted of a Fresnel lens for collecting solar light, and a tracking actuator for tracking solar light from sunrise to sunset to increase the light collection efficiency. The optical fiber that transmitted solar light was made of Glass Optical Fiber (GOF), and it had an excellent optical transmission rate. After collecting the solar light, the amount of light was measured at 5, 10, 15, 20, 25, and 30 cm distances from the GOF through the darkroom by using a light sensor logger connected to a quantum and pyranometer sensor. Compared with solar light, the light intensity of pyranometer sensor measured at 5 cm was 114% higher than solar light, and 61% at 10 cm. In addition, it was observed that it is possible to transmit the necessary amount of light for growing crops up to about 15 cm (as over 22%) through GOF. Therefore, adding diffusers to the solar light collector should be expected to replace artificial light in plant factories or plug seedlings nurseries for leafy vegetables. More studies on the solar light collection devices and the light transmission devices that have high light collection efficiency should be conducted.
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KEYWORD
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Fiber, Fresnel lens, Quantum, Spectrum, Wavelength
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