Browse > Article
http://dx.doi.org/10.5322/JESI.2019.28.11.1019

Analysis of Light Traits in a Solar Light-collector Device and its Effects on Lettuce Growth at an Early Growth Stage  

Lee, Sanggyu (Division of Smart Farm Development, National Institute of Agricultural Science, RDA)
Lee, Jaesu (Division of Smart Farm Development, National Institute of Agricultural Science, RDA)
Won, Jinho (Division of Smart Farm Development, National Institute of Agricultural Science, RDA)
Publication Information
Journal of Environmental Science International / v.28, no.11, 2019 , pp. 1019-1025 More about this Journal
Abstract
The aim of this study was to analyze the light traits in a solar light-collector device and its effects on lettuce growth at an early growth stage. The three hyper parameters used were the reflector diameter (2 cm and 4 cm), coating inside the reflector (chrome-coated, non-coated) and distance from the light fiber (15 cm and 20 cm). The results showed that light efficiency, which is the ratio of light intensity inside the fiber to the solar intensity, improved by 41.1 % when using a 2 cm diameter chrome-coated reflector at a distance of 15 cm from the light fiber; whereas it only improved by 20.6% when a non-coated reflector was used. As the reflector size was increased to 4 cm, the light efficiency for the coated and non-coated reflectors increased by 28.5 % and 26.4 %, respectively, hence, no significant difference was observed. When the light fiber was placed at a distance of 20 cm, the increase in light efficiency with coating treatment was 8 % higher than without coating treatment. We also compared the efficiency of light-fiber treatment with that of LED treatment in our lettuce nursery, and observed that the plants exhibited better growth with light-fiber treatment. We observed an average increase of 1.7 cm in leaf height, $7cm^2/plant$ increase in leaf area, and 32 mm increase in root length upon light-fiber treatment as opposed to those observed with LED treatment. These findings indicate that the collector light-fiber is economically feasible and it improves lettuce growth compared with the LED treatment.
Keywords
Collector light; Growth; Lettuce(Lactuca sativa L.); Light fiber; Leaf height;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
연도 인용수 순위
1 Jang, Y. S., 2005, The automatic system of plant factory, Res. Ext., 46, 44-47.
2 Jeong, H. G., Han, S. B., Jung, B. M., Lee, E. J., Lim, S. H., 2002, A Study on solar light collector using fresnel lens film, J. of Kor. Solar Energy Soc., 22, 81-86.
3 Jeong, H. J., Kim, W. S., Kim, Y. M., Han, H. J., Choi, W. G., 2017, Electric lighting energy saving through the use of a fresnel lens based fiber-optic solar lighting system: Simulation and measurements, J. of Kor. Solar Energy Soc., 37, 1-12.
4 Kang, H. M., Kim, I. S., 2007, Effect of nutrient solution composition modification on the internal quality of some of leaf vegetable in hydroponics, J. Bio-Env. Con., 16, 348-351.
5 Kim, J. H., 2009, The present state and future of plant factory, Res. of KREI, 61, 1-19.
6 Kim, Y. H., Lee, J. S., 2016, Growth and contents of anthocyanins and ascorbic acid in lettuce as affected by supplemental UV-A LED irradiation with different light quality and photoperiod, Kor. J. Hort. Sci. Techno., 34, 596-606.
7 Kim, Y. M., 2011, Study on the preformance enhancement of low-temperature solar application: Daylighting and adsorption desalination system, Master Thesis.
8 Kim, Y. S., Kwon, K. W., 2009, Skin load reduction technology of building, Korea Green Building Council, 38-41.
9 Kozai, T., 2007, Propagation, grafting and transplant production in closed systems with artificial lighting for commercialization in Japan, Propag Ornam Plants, 7, 145-149.
10 Lee, C. S., Kim, J. M., Park, Y. M., Sung, T. K., Joung, C. B., Kang, S. H., Kim, B. C., 2012, The development of solar tracking concave mirror type daylighting system, The Society of Air-Conditioning and Refrigerating Engineeris of Korea, summer Conference, 12-S-209.
11 Lee, C. S., Kim, J. M., Park, Y. M., Sung, T. K., Joung, C. B., Kang, S. H., Kim, B. C., 2013, Development of tracking daylighting system using Multi-Parabolic reflector, J. of Kor. Solar Energy Soc., 33, 56-63.   DOI
12 Lee, J. G., Oh, S. S., Cha, S. H., Jang, Y. A., Kim, S. Y., Um, Y. C., Cheong, S. R., 2010, Effects of red/blue light ratio and short-term light quality conversion on growth and anthocyanin contents of baby leaf lettuce, J. Bio-Env. Con., 19, 351-359.
13 Lee, S. R., Kang, T. H., Han, C. S., Oh, M. M., 2015, Air anions improve growth and mineral content of kale in plant factories, Hortic Environ Biotechnol., 56, 462-471.   DOI
14 Lee, Y. B., Jin, Y. H., Jo, S. S., Lee, C. E., 2000, Lettuce production in factory-style plant production system, Kor. J. Hort. Sci. Technol., 18, 178. (Abstr.)
15 Song, M. J., 2014, Air anion enhances growth of several edible sprouts and lettuce in a closed-type plant production system, Master's Thesis, Chungbuk National University, Cheongju, Korea, 34-43.
16 Mahdavian, K., Ghorbanli, M., Kalantari, K. M., 2008, The Effects of ultraviolet radiation on the contents of chlorophyll, flavonoid, anthocyanin and proline in Capsicum annuum L., Turk. J. Bot., 32, 25-33.
17 Oh, S. J., Lee, Y. J., Kim, N. J., Hyun, J. H., 2011, Development of an AVR MCU-based solar tracker, Journal of Energy Engineering, 20, 353-357.   DOI
18 Park, J. E., Park, Y. G., Jeong, B. R., Hwang, S. J., 2012, Growth and anthocyanin content of lettuce as affected by artificial light source and photoperiod in a closed-type plant production system, Kor. J. Hort. Sci. Technol., 30, 673-679.
19 Park, K. S., Bekhzod, K., Kwon, J. K., Son, J. E., 2016, Development of a coupled photosynthetic model of sweet basil hydroponically grown in plant factories, Hortic Environ Biotechnol., 57, 20-26.   DOI
20 Park, Y. C., 2000, Sun tracking system for active daylighting system, The Society of Air-Conditioning and Refrigerating Engineers of Korea, 11, 47-58.
21 Um, Y. C., Oh, S. S., Lee, J. G., Kim, S. Y., Jang, Y. A., 2010, The development of container-type plant factory and growth of leafy vegetables as affected by different light source, J. Bio-Env. Con., 19, 333-342.
22 Vu, N. H., Shin, S. Y., 2016, Cose-effective optical fiber daylighting system using modified compound parabolic concentrators, Solar Energy, 136, 145-152.   DOI
23 Yoon, Y. J., 2009, Architecture and Daylighting System, Journal of the Korea Solar Energy Society, 8, 3-10.
24 Yun, H. K., Zhang, C. H., Seo, T. C., Lee, J. W., 2006, Effect of selenium application concentration and periods on growth in garlic, J. Bio-Env. Con., 15, 346-351.