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여세동(Se Dong Yeo),임병주(Byung Ju Lim),유상석(Sang Seok Yu),정경열(Kyung Yul Chung),박창대(Chang Dae Park) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.8
태양열 및 발전기의 배기가스 폐열을 복합열원으로 이용하여 작동되는 하이브리드 태양열 해수담수기의 성능을 증가시키기 위한 실험을 수행하였다. 실험 장비는 집열 면적이 1 m×2 m인 단순 태양열 증류기와 수직 다중효용부로 구성되어 있다. 실험은 두 대의 동일한 하이브리드 태양열 해수담수기에 대하여 태양열을 열원으로 실외에서 다양한 운전 조건으로 수행하였다. 실험 결과 하이브리드 태양열 해수담수기의 담수 생산량은 다양한 운전 조건에 의존하였다. 태양열 증류기의 측면 유리에 단열을 하는 것과 낮은 초기 베이진 해수 수위는 태양열 해수담수기의 성능을 증가시켰다. 반사율이 평균 47%보다 낮은 반사휜의 적용은 예상과 다르게 총 생산량을 감소시켰다. 그러나 다중효용부로 공급하는 해수공급 유량은 실험 범위 내에서 생산량에 명확한 영향을 보이지 않았다. In this study, we have performed tests to improve the productivity of hybrid solar stills, which can be operated by solar thermal energy and/or waste heat of exhaust gas from electrical generators. The experimental apparatus is a hybrid solar still with a 1 m×2 m collecting area, which consists of a conventional simple solar still and a vertical multi-effect diffusion(MED) section. The experiments were conducted under various operating conditions, with two identical hybrid solar stills, using solar radiation as the energy source. The results of the tests showed that the yield of the hybrid solar still depends on the various operating conditions. Insulation at the side glasses and a lower basin seawater level increased the productivity of the hybrid solar still. Reflecting fins with less than 47% reflectivity unexpectedly decreased the total productivity. However, the various feeding flow rate of the seawater into MED part did not show clear effects on productivity in the tested range.
박창대(Chang-Dae Park),임병주(Byung Ju Lim),이성수(Sung-soo Lee),정경열(Kyung-Yul Chung) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Solar still is a kind of seawater distillation device using solar thermal energy and an artificial device imitating the global water cycle. Solar stills are cost-competitive compared to other renewable desalination technologies especially for very small-scale desalination devices. The low construction cost and high maintainability due mainly to its structural simplicity make it viable even nowadays. Nonetheless, solar stills have the disadvantage of low productivity. Therefore, many researches have been performed to increase its performance by developing the advanced solar stills that mostly modify their structures. However, the performance enhancement by these advanced still causes the structural complexity of the still. In this paper, we proposed two types of advanced solar stills, liquid film solar still and basin-free solar still, which aim to increase the performance and to keep structural simplicity. Design, manufacturing and performance test of the advanced solar stills were presented.
여세동(Sedong Yeo),정경열(Kyung-Yul Chung),안병훈(Byunghoon Ahn),박창대(Chang-Dae Park) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
We conducted parametric performance tests for hybrid solar still, which can be operated by solar thermal energy and/or waste heat. In this study, the solar radiation was used as thermal energy of the hybrid solar still with the 2 ㎡ collecting area. Experimental parameters include insulation condition at side glasses of the solar collecting part, reflecting fins in the basin of the solar still, seawater level in the basin of the solar still, and solar insolation. In the result of the performance tests for two identical hybrid solar stills, insulation of the side glasses improved performance. Reflecting fins in the basin had a negative effect on the production of distillates of basin part and multi-effect diffusion part of the solar still. Lower seawater level in the basin and higher solar insolation showed the better performance of the hybrid solar still.
여세동(Sedong Yeo),임병주(Byung-Ju Lim),정경열(Kyung-Yul Chung),박창대(Chang-Dae Park) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
We have tested to improve the productivity for hybrid solar still, which can be operated by solar thermal energy and/or waste heat of exhaust gas from the electrical generator. The apparatus has simple solar still with 1 m × 2 m collecting area and vertical multi-effect diffusion(MED) part. In this study, the experiments were conducted with two identical hybrid solar stills by solar radiation as energy source. The experiments about various operating conditions were performed at the outdoor. In the result of the tests, the yield of the hybrid solar still depended on the various operating conditions. Insulation with side glasses and lower basin seawater level at the simple solar still increase the productivity of the solar still. Reflecting fins less than 60% reflectivity decrease the total productivity. However, the feeding flow rate of the seawater into MED part scarcely affected the productivity in tested range.
압출 가공 wick-free plate가 적용된 다중효용확산 태양열 증류기의 성능 실험
이가람(Lee Ga-Ram),임병주(Lim Byung-Ju),최석민(Choi Seok-Min),박창대(Park Chang-Dae) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.1
We have developed a wick-free plate (WFP) in which a groove pattern is applied to the surface of a plate to replace the wick-plate, which is a key component of a multi-effect diffusion distiller (MEDD). Wicks and plates act as an evaporation surface and a condensation surface, respectively, in MEDD. However, the wick-plate structure has several problems, such as laborious manufacturing processes and lower durability. Therefore, in this study, WFPs were manufactured using the extrusion method, and MEDD with WFPs was experimentally evaluated. The extrusion method had a lower processing cost and better corrosion-resistance surface than the etching process that was employed in our previous study. The extruded WFP could lower the manufacturing cost by 77% compared to the etched WFP, and had the advantage of absorbing more solar radiation energy by lowering the installation inclination angle by 10°. After fabricating the triple-effect MEDD with the extruded WFPs, an indoor performance experiment was conducted. The results of the solar thermal performance test indicated that WFP-MEDD at 11.7 MJ/(㎡·d) of thermal energy produced 3% higher freshwater than the existing MEDD with a wick-plate.