• Title/Summary/Keyword: solar thermal energy

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Photovoltaic Properties in $CuPc/C_{60}$ heterojunction Structure ($CuPc/C_{60}$ 이종접합을 이용한 광기전 특성)

  • Kim, S.K.;Lee, H.D.;Huh, S.W.;Chung, D.H.;Oh, H.S.;Lee, W.J.;Lee, J.U.;Kim, T.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.05d
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    • pp.65-68
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    • 2003
  • Recently, there is a growing concern on the photovoltaic effects using organic materials. This is a phenomena which converts the solar energy into the electrical one. We have fabricated a device structure of ITO/PEDOT:PSS/CuPc/$C_{60}$/BCP/Al. The PEDOT:PSS layer is made by spin coating. and the other organic layers are made by thermal vapor deposition. By measuring the current-voltage characteristics with an illumination of light. we have obtained a value of $V_{oc}$=0.358V and $J_{sc}$=0.338mA/$cm^2$. A fill factor and efficiency are about 0.271 and 0.033%, respectively. A 500W xenon lamp(ORIEL) was used for a light source, and the light intensity illuminated into the device was about 10mW.

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Small-Capacity Solar Cooling System by Desiccant Cooling Technology (태양열 이용 소용량 제습냉방시스템)

  • Lee, Dae-Young;Kwon, Chi-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.154-156
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    • 2008
  • A prototype of the desiccant cooling system with a regenerative evaporative cooler was built and tested for the performance evaluation. The regenerative evaporative cooler is to cool a stream of air using evaporative cooling effect without an inc6rease in the humidity ratio. It is comprised of multiple pairs of dry and wet channels and the evaporation water is supplied only to the wet channels. By redirecting a portion of the air flown out of the dry channel into the wet channel, the air can be cooled down to a temperature lower than its inlet wet-bulb temperature at the outlet end of the dry channels. Incorporating a regenerative evaporative cooler eliminates the need for deep dehumidification in the desiccant rotor that is necessary to achieve low air temperature in the system with a direct evaporative cooler. Subsequently, the regenerative evaporative cooler enables the use of low temperature heat source to regenerate the dehumidifier permitting the desiccant cooling system more beneficial compared with other thermal driven air conditioners. At the ARI condition with the regeneration temperature of $60^{\circ}C$, the prototype showed the cooling capacity of 4.4 kW and COP of 0.75.

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Effect of the building envelope on heating and cooling load in super tall building considering the meteorological changes with height (높이별 기상변화를 고려한 초고층 건축물의 외피종류별 냉난방 부하특성 분석)

  • Choi, Jong-Kyu;Kim, Yang-Soo;Song, Doo-Sam
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.337-344
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    • 2012
  • Today, the number of super tall buildings are under construction or being planed in Middle East and Asian Countries. For example the burj Khalifa, the tallest building in the world, is completed in 2008 and the height of that is about 800m. Also, Lotte World Tower is under construction in Korea. External environmental conditions such as wind speed, air temperature, humidity and solar radiation around the super tall building differs according to the building height due to the vertical micro climate change. However, the meteorological information used for AC design of building is obtained typically from standard surface meterological station data(~2m above the ground). In this paper the effect of the building envelope on heating and cooling load in super tall building considering the meteorological changes with height was analyzed with simulation method. As results of this research, the guideline to select the building envelop alternatives for super tall building will be suggested in this paper.

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Photovoltaic Properties of Organic Photovoltaic cell (유기물을 이용한 Photovoltaic cell의 광기전력 특성)

  • Kim, S.K.;Lee, H.D.;Chung, D.H.;Oh, H.S.;Hong, J.I.;Park, J.W.;Kim, T.W.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.04a
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    • pp.123-126
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    • 2003
  • Recently, there is a growing concern on the photovoltaic effects using organic materials. This is a phenomena which converts the solar energy into the electrical one. We have fabricated a device structure of $ITO/PEDOT:PSS/CuPc/C_{60}/BCP/AI$. The PEDOT:PSS layer is made by spin coating, and the other organic layers are made by thermal vapor deposition. By measuring the current-voltage characteristics with an illumination of light, we have obtained value of Voc=0.38V, Jsc=$0.5mA/cm^{2}$. And a fill factor and efficiency are about 0.314 and 0.083%, respectively. A 500W xenon lamp(ORIEL) is used for a light source, and the light intensity illuminated into the device was about 10mW.

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Synthsis of $CuInSe_2$ nanoparticles and its application to the absorber layer for thin films solar cells ($CuInSe_2$ 나노 입자 합성 및 이를 이용한 광흡수층 박막 제조)

  • Kim, Kyun-Hwan;Ahn, Se-Jin;Yun, Jae-Ho;Gwak, Ji-Hye;Jo, A-Ra;Kim, Do-Jin;Yoon, Kyung-Hoon
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.11a
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    • pp.396-396
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    • 2009
  • Chalcopyrite semiconductor $CuInSe_2$ nanoparticles were prepared using a low temperature colloidal route by reacting the starting materials (CuI, $InI_3$ and $Na_2Se$) in solvents. After synthesised $CuInSe_2$ nanoparticles precursors were mixed with organic binder for the viscosity of the precursor slurry to be suitable for the doctor blade method. The mixture of $CuInSe_2$ and binder was deposited onto molybdenum-coated sodalime glass substrates to form thin film. The precursor thin films were preheated on the hot plate to remove remaining solvents and binder material. After subsequent thermal processing of the thin film under a selenium ambient, $CuInSe_2$ absorber layer with grain size significantly lager than that of the nanoparticles was formed.

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Characterization of CIGS Solar Cell for Flexible Steel Substrate by Surface Roughness (유연 철강기판 표면조도에 따른 CIGS 태양전지의 특성 분석)

  • Kim, Daesung;Hwang, Moonsick;Kim, Daekyong;Lee, Duckhoon;Kim, Taesung
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.11a
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    • pp.58.1-58.1
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    • 2011
  • CIS(CuInSe2)계 화합물 태양전지는 높은 광흡수계수와 열적 안정성으로 고효율 태양전지 제조가 가능하여 태양전지용 광흡수층으로 매우 이상적이다. 미국 NREL에서는 이러한 CIGS 태양전지를 Co-evaporation 방법으로 제조 20%이상의 에너지 변환 효율을 달성하였다고 보고하였다. CIGS 태양전지의 경우 기존의 유리 기판 대신 유연한 철강 기판을 사용해 태양 전지를 flexible하게 제조 할 수 있다는 장점이 있다. 이러한 flexible 태양전지의 경우 기존의 rigid 태양전지의 적용분야 뿐만 아니라 BIPV, 선박, 장난감, 군용, 자동차등 더욱 더 많은 분야에 활용이 가능하다. 본 연구에서는 기존의 rigid한 기판인 soda lime glass와 flexible 기판인 stainless steel 기판으로 소자를 제조하여 효율을 비교 분석 및 stainless steel 기판의 표면 처리 방법에 따라서 표면 조도의 특성을 분석하여 stainless steel 기판별 효율 특성도 비교 분석 하였다. 후면전극으로는 약 $1{\mu}m$의 Mo를 DC Sputtering 방법을 이용하여 증착하였고, CIGS 광흡수층은 약 $2.5{\mu}m$의 두께로 미국의 NREL과 같은 3 stage 방식을 이용하여 광흡수층을 Co-Evaporation 방법으로 제조하였고, 버퍼층인CdS는 약 50nm의 두께로 CBD 방법으로 제조 하였으며, 창층인 ZnO는 약 500nm 두께로 RF Sputtering 방법으로 제조 하였고, 마지막으로 약 $1{\mu}m$ 두께의 Al 전면전극은 Thermal Evaporation 방법으로 제조 하였다. 소자의 물리적, 전기적 특성을 분석하기위해 FE-SEM, AFM, Solar Cell Simulator 분석을 실시하였다.

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Theoretical fabrication of Williamson nanoliquid over a stretchable surface

  • Sharif, Humaira;Hussain, Muzamal;Khadimallah, Mohamed Amine;Ayed, Hamdi;Taj, Muhammad;Bhutto, Javed Khan;Mahmoud, S.R.;Iqbal, Zafer;Ahmad, Shabbir;Tounsi, Abdelouahed
    • Advances in concrete construction
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    • v.14 no.2
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    • pp.103-113
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    • 2022
  • On the basis of fabrication, the utilization of nano material in numerous industrial and technological system, obtained the utmost significance in current decade. Therefore, the current investigation presents a theoretical disposition regarding the flow of electric conducting Williamson nanoliquid over a stretchable surface in the presence of the motile microorganism. The impact of thermal radiation and magnetic parameter are incorporated in the energy equation. The concentration field is modified by adding the influence of chemical reaction. Moreover, the splendid features of nanofluid are displayed by utilizing the thermophoresis and Brownian motion aspects. Compatible similarity transformation is imposed on the equations governing the problem to derive the dimensionless ordinary differential equations. The Homotopy analysis method has been implemented to find the analytic solution of the obtained differential equations. The implications of specific parameters on profiles of velocity, temperature, concentration and motile microorganism density are investigated graphically. Moreover, coefficient of skin friction, Nusselt number, Sherwood number and density of motile number are clarified in tabular forms. It is revealed that thermal radiation, thermophoresis and Brownian motion parameters are very effective for improvement of heat transfer. The reported investigation can be used in improving the heat transfer appliances and systems of solar energy.

Effects of rapid thermal annealing on Physical properties of polycrystalline CdTe thin films (급속열처리가 다결정 CdTe 박막의 물성에 미치는 효과에 관한 연구)

  • 조영아;이용혁;윤종구;오경희;염근영;신성호;박광자
    • Journal of the Korean Vacuum Society
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    • v.5 no.4
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    • pp.348-353
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    • 1996
  • Rapid thermal annealing (RTA) was applied to polycrystalline CdTe thin films evaporated on CdS/ITO/glass substrate and the effect of the annealing temperatures and the atmosphere on physical properties of polycrystalline CdTe thin films and CdTe/CdS solar cell characteristics were studied. Results obtained by EDX showed that the bulk composition of CdTe remained stoichiometric after annealing at $550^{\circ}C$ in the air but the surface composition became Cd-rich. Cross-sectional TEM and micro EDX showed that columnar grains and micro-twins remained even after RTA, however, and the sulfur content in the annealed CdTe (added by sulfur diffusion from CdS during the annealing) was much smaller than that by furnace annealing. Among the investigated RTA temperatures and gas environments, the cell made with CdTe annealed at $550^{\circ}C$ in air showed the best solar energy conversion efficiency.

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A Study on Power Trading Methods for in a Hydrogen Residential Model (수소주거모델의 전력 거래 참여 방안 고찰)

  • KISEOK JEONG;TAEYOUNG JYUNG
    • Journal of Hydrogen and New Energy
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    • v.34 no.2
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    • pp.91-99
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    • 2023
  • Participation in power trading using surplus power is considered a business model active in the domestic energy trade market, but it is limited only if the legal requirements according to the type, capacity, and use of the facilities to be applied for are satisfied. The hydrogen residential demonstration model presented in this paper includes solar power, energy storage system (ESS), fuel cell, and water electrolysis facilities in electrical facilities for private use with low-voltage power receiving system. The concept of operations strategy for this model focuses on securing the energy self-sufficiency ratio of the entire system, securing economic feasibility through the optimal operation module installed in the energy management system (EMS), and securing the stability of the internal power balancing issue during the stand-alone mode. An electric facility configuration method of a hydrogen residential complex demonstrated to achieve this operational goal has a structure in which individual energy sources are electrically connected to the main bus, and ESS is also directly connected to the main bus instead of a renewable connection type to perform charging/discharging operation for energy balancing management in the complex. If surplus power exists after scheduling, participation in power trading through reverse transmission parallel operation can be considered to solve the energy balancing problem and ensure profitability. Consequentially, this paper reviews the legal regulations on participation in electric power trading using surplus power from hydrogen residential models that can produce and consume power, gas, and thermal energy including hybrid distributed power sources, and suggests action plans.

heat distribution of photovoltaic module with current (전류에 따른 태양전지 모듈의 열 분포)

  • Kim, Tae-Bum;Jung, Tae-Hee;Shin, Jun-Oh;Won, Chang-Sub;Ji, Yang-Geun;Kong, Ji-Hyun;Kang, Gi-Hwan;Han, Hyung-Keun;Han, Deuk-Young
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.469-470
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    • 2009
  • 본 논문은 전류의 변화에 따른 태양전지 모듈의 열 분포에 대하여 실험하였다. 태양전지 모듈의 경우 내구성의 문제가 대두되고 있는데 그 중에 열에 의한 노화현상이 가장 큰 문제이다. 실제적으로 태양전지 모듈에서 저 전류와 고 전류의 경우에서 서로 상이한 열 분포가 이루어지고 있다. 이번 연구를 통해 열 해석에 있어서 전류에 따른 태양전지 모듈에서의 열에 의한 노화현상을 좀 더 정확히 예측 할 수 있을 것이다.

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