영농형 태양광 발전 솔라쉐어링에 따른 하부 일사량 변화의 해석 및 분석

이상익 ( Lee Sang-ik ),최진용 ( Choi Jin-yong ),성승준 ( Sung Seung-joon ),이승재 ( Lee Seung-jae ),이지민 ( Lee Jimin ),최원 ( Choi Won ) 한국농공학회 2020 한국농공학회논문집 Vol.62 No.5

Solar-sharing, which is an agricultural photovoltaic system installing solar panels on the upper part of crop growing field, has especially drawn attention. Because paddy fields for cultivating crops are large flat areas, there have been various attempts to utilize solar energy for solar photovoltaic as well as growth of crops in agriculture. Solar-sharing was first proposed in Japan, and has been actively studied for optimization and practical uses. The domestic climate differs from the climate conditions in which the solar-sharing has been widely studied, therefore, it is required to develop the solar-sharing technology suitable for the domestic climate. In this study, a simulation model was developed to analyze the change of solar radiation resulted from the solar-sharing installation. Monthly solar illumination intensity and the change of illumination intensity according to the various conditions of solar panel installation were simulated. The results of monthly illumination analysis differed by altitude of the sun, which was related to season. In addition, it was analyzed that the monthly illumination decreased by up to 42% due to solar-sharing. Accordingly, it is recommended that solar-sharing should be installed as a way to maximize the efficiency of solar photovoltaic system while minimizing the decrease in solar radiation reaching the crops.

발광 다이오드(LED)를 이용한 대형 태양전지 판넬 평가용 인공 태양광 구성

정광교,김주현,류재준,이석환,고영수,허산,문성득,이승현,김동현,장미나,김정미,구지은,장지호,Jung, Kwang-Kyo,Kim, Joo-Hyun,Ryu, Jae-Jun,Lee, Seok-Hwan,Ko, Young-Soo,Huh, San,Moon, Sung-Deuk,Lee, Seung-Hyun,Kim, Dong-Hyun,Jang, Mi-Na,Kim, Jeon 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.9

We developed a new solar simulator to evaluate a large-scale solar cell using seven kinds of LEDs (Infrared, Red, Yellow, Green, Blue, White and Ultra Violet LED). LED solar simulator can be displaced the existing solar simulator which has several demerits such as high power consumption and short lifetime. We have tried to fabricate LED solar simulator which fulfills the spectrum for AM 1.5G condition, and to verify the feasibility of LED solar simulator.

대면적 태양전지의 분할 수에 따른 모듈 특성 모델링

김주휘 ( Juhwi Kim ),이재형 ( Jaehyeong Lee ) 한국전기전자재료학회 2023 전기전자재료학회논문지 Vol.36 No.2

In the past, the efficiency of solar cells had been increased in order to increase the efficiency of solar modules. However, in recent years, in order to increase output in the solar industry and market, the competitiveness of solar cells based on large-area solar cells and multi-bus bar has been increasing. Multi-busbar solar module is a technology to reduce power loss by increasing the number and width of the front busbar of the solar cell and reducing the current value delivered by the busbar by half through half-cutting. In the case of the existing M2 (156.75×156.75 ㎟) solar cell, even with a half-cut, power loss could be sufficiently reduced, but as the area of the solar cell is enlarged to more than M6 (166×166 ㎟), the need for more divisions emerged. This affected not only solar cells but also inverters required for module array configuration. Therefore, in this study, the electrical characteristics of a large-area solar cell and after division were extracted using Griddler simulation. The output characteristics of the module were predicted by applying the solar cell parameters after division to PSPice, and a guideline for the large-area solar module design was presented according to the number of divisions of the large-area solar cell.

우주환경시험용 태양광 모사기 기술 동향

박성욱(Park, Sung-wook),전수환(Jun, Soohwan),서희준(Seo, Hee-jun),조혁진(Cho, Hyokjin),이혜진(Yi, Hye-jin) 한국항공우주연구원 2019 항공우주산업기술동향 Vol.17 No.2

위성체의 성공적인 임무 수행을 위해서는 발사 전 지상에서 우주 환경 모사 시험을 수행하는 것이 필수적이다. 위성체 우주 환경 모사 시험에는 주로 열진공 챔버를 사용하지만, 일반적인 열진공 챔버 기능만으로는 우주 궤도상의 다양한 열환경 모사에 한계가 있다. 이러한 한계를 극복하기 위해 세계의 유수 우주개발기관에서는 열진공 챔버에 태양광 모사기를 설치하여 태양 복사환경을 구현하고 있다. 본 논문은 우주환경시험용 태양광모사기의 시스템 구성, 세계 유수기관의 운용 현황 및 기술 동향에 대해 기술하였다. For the successful mission of a satellite, it is essential to conduct a space environmental simulation test on the ground before the launch. Although thermal vacuum chamber is mainly used for space simulation for satellite, thermal vacuum chamber has limitations in simulating various thermal environment in space orbit. Solar simulator is used to overcome these limitation, and the world’s leading space developer is operating solar simulator. In this paper, system overview of solar simulator, the current operation state and the technical trend of solar simulator are described.

CFD-Based Evaluation of the Efficiency for Solar Collectors with Fresnel Lenses

( Kyeong Sik Kang ),( Gwi Hyun Lee ) 한국농업기계학회 2023 한국농업기계학회 학술발표논문집 Vol.28 No.2

The main objectives of this study are to evaluate the performance of a solar thermal collection system utilizing Fresnel lenses through CFD simulation. Solar energy is an infinite energy source, and it can be used for heating and thermal systems. The efficiency of solar thermal energy systems is primarily dependent on the efficiency of the collector unit, leading to the development of various solar thermal systems. In this research, CFD numerical analyses were conducted on two types of solar collection systems using Fresnel lenses to maximize the efficiency of solar energy collection. The first system consists of 16 small Fresnel lenses, a square pipe through which the heat transfers medium flows, and the collector component, forming a flat plate type collector. The second system comprises a single large Fresnel lens and a double-cylinder shell-type absorber that absorbs heat from the lens. To perform CFD analysis, the geometry of the solar thermal collection system was created using 3D modeling software, and a mesh was generated on the 3D model. Subsequently, ANSYS Fluent 2022 R2 software was used to establish the physical models describing the fluid dynamics and heat transfer within the solar thermal collection system, along with setting boundary conditions involving external heat sources. Numerical analysis was then conducted using the software, and the results of both systems were analyzed. While the flat plate collector averaged 60-70% efficiency, a single large Fresnel lens with the double cylindrical shell absorber outperformed it by approximately 5% with an average efficiency of 65-75%. A satisfactory agreement was found when comparing the experimental data from previous studies with the results of this research. In the future, it is anticipated that this system can be further analyzed under various conditions, including different heat transfer media and solar radiation levels. A solar collector of the single large Fresnel lens had demonstrated higher efficiency, and it is believed that improvements in performance and cost-related challenges could make it suitable for applications requiring high energy efficiency, such as hot water supply and heating and cooling systems.

A Simulation Study on the Electrical Structure of Interdigitated Back-contact Silicon Solar Cells

강민구,송희은,김수민,김동환 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.10

In this paper, a simulation for interdigitated back-contact (IBC) silicon solar cells was performed by using Silvaco TCAD ATLAS to investigate the cell’s electrical properties. The impacts of various parameters, including the depth of the front surface field(FSF), the FSF peak doping concentration, the depths of the emitter and the back surface field(BSF), the peak doping concentrations of the emitter and BSF, the base doping, and the bulk lifetime on the output characteristics like the light current-voltage curves and the internal quantum efficiency of the IBC solar cell, were investigated. The light absorption was determined by adjusting the antireflection coating and the Al thickness. The FSF must be thin and have a low doping concentration for high-efficiency IBC cells. If the conversion efficiency is to be improved, a thick emitter and a high doping concentration are needed. Because of the low resistivity of the Si substrate, the series resistance was reduced, but recombination was increased. With a high-resistivity Si substrate, the opposite trends were observed. By counter-balancing the series resistance and the recombination, we determined by simulation that the optimized resistivity for the IBC cells was 1 ·cm. Because all metal electrodes in the IBC cells are located on the back side, a higher minority carrier lifetime showed a higher efficiency. After the various parameters had been optimized, texturing and surface recombination were added into the simulation. The simulated IBC cells showed a short-circuit current density of 42.89 mA/cm2, an open-circuit voltage of 714.8 mV, a fill factor of 84.04%, and a conversion efficiency of 25.77%.

고온 태양열을 이용한 합성가스 및 수소 생산 : ZrO2나노 구조화에 따른 산화/환원 특성

장종탁(Jang Jong-Tak),이종민(Lee Jong-Min),조은수(Cho Eun-Su),양승찬(Yang Seung-Chan),윤기준(Yoon Ki-June),한귀영(Han Gui-Young) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3

Solar thermochemical syngas and hydrogen production process by redox system of metal oxide was performed under direct irradiation of the metal oxide on the SiC ceramic foam device using solar simulator. CeO2/ZrO2 nanotube has been synthesized by anodic oxidation method. Syngas and hydrogen production process is one of the promising chemical pathway for storage and transportation of solar heat by converting solar energy to chemical energy. The produced syngas had the H2/CO ratio of 2, which was suitable for methanol synthesis or Fischer-Tropsch synthesis process. After ten cycles of redox reaction, CeO2 was analyzed using XRD pattern and SEM image in order to characterize the physical and chemical change of metal oxide at the high temperature.

Hazards Caused by UV Rays of Xenon Light Based High Performance Solar Simulators

Dibowski, Gerd,Esser, Kai Occupational Safety and Health Research Institute 2017 Safety and health at work Vol.8 No.3

Background: Solar furnaces are used worldwide to conduct experiments to demonstrate the feasibility of solar-chemical processes with the aid of concentrated sunlight, or to qualify high temperature-resistant components. In recent years, high-flux solar simulators (HFSSs) based on short-arc xenon lamps are more frequently used. The emitted spectrum is very similar to natural sunlight but with dangerous portions of ultraviolet light as well. Due to special benefits of solar simulators the increase of construction activity for HFSS can be observed worldwide. Hence, it is quite important to protect employees against serious injuries caused by ultraviolet radiation (UVR) in a range of 100 nm to 400 nm. Methods: The UV measurements were made at the German Aerospace Center (DLR), Cologne and Paul-Scherrer-Institute (PSI), Switzerland, during normal operations of the HFSS, with a high-precision UV-A/B radiometer using different experiment setups at different power levels. Thus, the measurement results represent UV emissions which are typical when operating a HFSS. Therefore, the biological effects on people exposed to UVR was investigated systematically to identify the existing hazard potential. Results: It should be noted that the permissible workplace exposure limits for UV emissions significantly exceeded after a few seconds. One critical value was strongly exceeded by a factor of 770. Conclusion: The prevention of emissions must first and foremost be carried out by structural measures. Furthermore, unambiguous protocols have to be defined and compliance must be monitored. For short-term activities in the hazard area, measures for the protection of eyes and skin must be taken.

다공성 실리콘 카바이드를 사용하는 태양열 공기식 흡수기의 열전달 특성에 관한 수치적 연구

정의국(Jung Eui-Guk),김종규(Kim Jong-Kyu),강용혁(Kang Yong-Heack),이상남 한국태양에너지학회 2010 한국태양에너지학회 학술대회논문집 Vol.2010 No.4

In this study, numerical simulation was conducted on the solar air receiver module. The heat transfer characteristics of the receiver module multi-channeled silicon carbide (SiC) honeycombs solar air receiver under concentrated solar radiation were investigated by numerical simulation. A series of modeling and simulation was conducted to achieve practical design requirements. The porosity of the SiC sample was around 15%. Bench scale system was composed of the sixteen SiC modules. Dimension of a module is 35 ㎜(W) × 35 ㎜(H) × 172 ㎜(L), and 100 square straight channels was shaped to induce air flow. Thermal absorption performance of the receiver section was of a major concern. Solar irradiation heat flux and air mass flow rate are considered as main variables to investigate receiver absorption performance. The objective of this work was to find heat flux and mass flow rate conditions to reach minimum outlet air temperature of 700℃. Simulation results were presented with varying six inlet and boundary conditions.

Verification of Energy Model of Solar-Powered UAV Using Virtual Flight Evaluation

Seong-Hwan Kim,Giancarlo Eder Guerra Padilla,Kee-Ho Yu 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10

In this paper, using the virtual flight evaluation system, the verification of energy model of a solar-powered UAV considering the flight motion is conducted. The energy sources of a solar-powered UAV are the solar energy and rechargeable batteries. The acquired energy of solar-powered UAV is determined by the sun position and the attitude of a UAV. Therefore, the energy acquisition and consumption model of a solar-powered UAV is presented. For the virtual flight experiment, the state of charge of the battery is measured using the electronic load instrument. Also, the virtual flight experiment was carried out using the ground testbed for about 27 hours. The virtual flight system is composed of the measurement system, propulsion system, power system and wings covered with solar cells. To verify the energy model of a solar-powered UAV, the experimental result was compared and analyzed with the simulation.