Academic literature on the topic 'Concentrating systems'

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Journal articles on the topic "Concentrating systems"

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Pitz-Paal, R. "Concentrating Solar Power Systems." EPJ Web of Conferences 148 (2017): 00008. http://dx.doi.org/10.1051/epjconf/201714800008.

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Zhou, Zheng, Qiang Cheng, Pingping Li, and Huaichun Zhou. "Non-imaging concentrating reflectors designed for solar concentration systems." Solar Energy 103 (May 2014): 494–501. http://dx.doi.org/10.1016/j.solener.2014.03.001.

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ARVIZU, DAN E., and ELDON C. BOES. "Photovoltaic Concentrating Systems and Components†." International Journal of Solar Energy 6, no. 6 (January 1988): 311–30. http://dx.doi.org/10.1080/01425918808914237.

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Bainier, C., C. Hernandez, and D. Courjon. "Solar concentrating systems using holographic lenses." Solar & Wind Technology 5, no. 4 (January 1988): 395–404. http://dx.doi.org/10.1016/0741-983x(88)90006-9.

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Sharan, S. N., S. S. Mathur, and T. C. Kandpal. "Economic feasibility of photovoltaic concentrating systems." Solar Cells 15, no. 3 (November 1985): 199–209. http://dx.doi.org/10.1016/0379-6787(85)90077-8.

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Kawauchi, Hiroshi, and Bridget I. Baker. "Melanin-concentrating hormone signaling systems in fish." Peptides 25, no. 10 (October 2004): 1577–84. http://dx.doi.org/10.1016/j.peptides.2004.03.025.

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Atkinson, Carol, Chris L. Sansom, Heather J. Almond, and Chris P. Shaw. "Coatings for concentrating solar systems – A review." Renewable and Sustainable Energy Reviews 45 (May 2015): 113–22. http://dx.doi.org/10.1016/j.rser.2015.01.015.

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Li, Guiqiang, Qingdong Xuan, M. W. Akram, Yousef Golizadeh Akhlaghi, Haowen Liu, and Samson Shittu. "Building integrated solar concentrating systems: A review." Applied Energy 260 (February 2020): 114288. http://dx.doi.org/10.1016/j.apenergy.2019.114288.

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Helmers, Henning, Andreas W. Bett, Jürgen Parisi, and Carsten Agert. "Modeling of concentrating photovoltaic and thermal systems." Progress in Photovoltaics: Research and Applications 22, no. 4 (September 14, 2012): 427–39. http://dx.doi.org/10.1002/pip.2287.

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Karatairi, Eva, and Andrea Ambrosini. "Improving the efficiency of concentrating solar power systems." MRS Bulletin 43, no. 12 (December 2018): 920–21. http://dx.doi.org/10.1557/mrs.2018.301.

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Dissertations / Theses on the topic "Concentrating systems"

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Buie, Damien Charles William. "Optical considerations in solar concentrating systems." University of Sydney. Physics, 2004. http://hdl.handle.net/2123/587.

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To optimise the performance of concentrating solar power systems, a detailed knowledge of the resultant flux distribution in the imaging plane is required. To achieve this, an accurate model of the direct solar beam impinging on the concentrator is essential. This thesis presents an empirical model of the terrestrial solar distribution that has both a high-correlation to observed data and an invariance to a change in location. The model is based on the amount of circumsolar radiation in the direct beam and takes into account the small variations that are due to atmospheric scattering. A modelling framework is developed to simulate the flux distribution in the imaging plane of a generic solar concentrating system. Algorithms are developed to include the following: the spatial solar energy distribution; the systemic effect of reflecting that distribution off a non-ideal mirrored surface; the spectral energy distribution; the transmission, absorption and reflection characteristics of optical thin films; and the coordinates of the solar vector. The framework is then used to investigate the performance of anti-reflection coatings on silicon substrates and the performance of linear Fresnel systems. Combined, these algorithms and simulation tools can be applied to create comprehensive optical models of solar concentrating systems.
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Buie, Damien Charles William. "Optical considerations in solar concentrating systems." Thesis, The University of Sydney, 2003. http://hdl.handle.net/2123/587.

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To optimise the performance of concentrating solar power systems, a detailed knowledge of the resultant flux distribution in the imaging plane is required. To achieve this, an accurate model of the direct solar beam impinging on the concentrator is essential. This thesis presents an empirical model of the terrestrial solar distribution that has both a high-correlation to observed data and an invariance to a change in location. The model is based on the amount of circumsolar radiation in the direct beam and takes into account the small variations that are due to atmospheric scattering. A modelling framework is developed to simulate the flux distribution in the imaging plane of a generic solar concentrating system. Algorithms are developed to include the following: the spatial solar energy distribution; the systemic effect of reflecting that distribution off a non-ideal mirrored surface; the spectral energy distribution; the transmission, absorption and reflection characteristics of optical thin films; and the coordinates of the solar vector. The framework is then used to investigate the performance of anti-reflection coatings on silicon substrates and the performance of linear Fresnel systems. Combined, these algorithms and simulation tools can be applied to create comprehensive optical models of solar concentrating systems.
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Baig, Hasan. "Enhancing performance of building integrated concentrating photovoltaic systems." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/17301.

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Buildings both commercial and residential are the largest consumers of electricity. Integrating Photovoltaic technology in building architecture or Building Integrated Photovoltaics (BIPV) provides an effective means for meeting this huge energy demands and provides an energy hub at the place of its immediate requirement. However, this technology is challenged with problems like low efficiency and high cost. An effective way of improving the solar cell efficiency and reducing the cost of photovoltaic systems is either by reducing solar cell manufacturing cost or illuminating the solar cells with a higher light intensity than is naturally available by the use of optical concentrators which is also known as Concentrating Photovoltaic (CPV) technology. Integrating this technology in the architecture is referred as Building integrated Concentrating Photovoltaics (BICPV). This thesis presents a detailed performance analysis of different designs used as BICPV systems and proposes further advancements necessary for improving the system design and minimizing losses. The systems under study include a Dielectric Asymmetric Compound Parabolic Concentrator (DiACPC) designed for 2.8×, a three-dimensional Cross compound parabolic concentrator (3DCCPC) designed for 3.6× and a Square Elliptical Hyperbolic (SEH) concentrator designed for 6×. A detailed analysis procedure is presented showcasing the optical, electrical, thermal and overall analysis of these systems. A particular issue for CPV technology is the non-uniformity of the incident flux which tends to cause hot spots, current mismatch and reduce the overall efficiency of the system. Emphasis is placed on modelling the effects of non-uniformity while evaluating the performance of these systems. The optical analysis of the concentrators is carried out using ray tracing and finite element methods are employed to determine electrical and thermal performance of the system. Based on the optical analysis, the outgoing flux from the concentrators is predicted for different incident angles for each of the concentrators. A finite element model for the solar cell was developed to evaluate its electrical performance using the outputs obtained from the optical analysis. The model can also be applied for the optimization of the front grid pattern of Si Solar cells. The model is further coupled within the thermal analysis of the system, where the temperature of the solar cell is predicted under operating conditions and used to evaluate the overall performance under steady state conditions. During the analysis of the DiACPC it was found that the maximum cell temperature reached was 349.5 K under an incident solar radiation of 1000 W/m2. Results from the study carried on the 3DCCPC showed that a maximum cell temperature of 332 K is reached under normal incidence, this tends to bring down the overall power production by 14.6%. In the case of the SEH based system a maximum temperature of 319 K was observed on the solar cell surface under normal incidence. An average drop of 11.7% was found making the effective power ratio of the system 3.4. The non-uniformity introduced due to the concentrator profile causes hotspots in the BICPV system. The non-uniformity was found to reduce the efficiency of the solar cell in the range of 0.5-1 % in all the three studies. The overall performance can be improved by addressing losses occurring within different components of the system. It was found that optical losses occurred at the interface region formed due to the encapsulant spillage along the edges of the concentrator. Using a reflective film along the edge of the concentrating element was found to improve the optical efficiency of the system. Case studies highlighting the improvement are presented. A reflective film was attached along the interface region of the concentrator and the encapsulant. In the case of a DiACPC, an increase of 6% could be seen in the overall power production. Similar case study was performed for a 3DCCPC and a maximum of 6.7% was seen in the power output. To further improve the system performance a new design incorporating conjugate reflective-refractive device was evaluated. The device benefits from high optical efficiency due to the reflection and greater acceptance angle due to refraction. Finally, recommendations are made for development of a new generation of designs to be used in BiCPV applications. Efforts are made towards improving the overall performance and reducing the non-uniformity of the concentrated illumination.
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Coventry, Joseph Sydney. "A solar concentrating photovoltaic/thermal collector /." View thesis entry in Australian Digital Theses Program, 2004. http://thesis.anu.edu.au/public/adt-ANU20041019.152046/index.html.

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Morfeldt, Johannes. "Optically Selective Surfaces in low concentrating PV/T systems." Thesis, Örebro University, School of Science and Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-7396.

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One of the traditional approaches to reduce costs of solar energy is to use inexpensive reflectors to focus the light onto highly efficient solar cells. Several research projects have resulted in designs, where the excess heat is used as solar thermal energy.

Unlike a solar thermal system, which has a selective surface to reduce the radiant heat loss, a CPV/T (Concentrating PhotoVoltaic/Thermal) system uses a receiver covered with solar cells with high thermal emittance.

This project analyzes whether the heat loss from the receiver can be reduced by covering parts of the receiver surface, not already covered with solar cells, with an optically selective coating. Comparing different methods of applying such a coating and the long-term stability of low cost alternatives are also part of the objectives of this project.

To calculate the heat loss reductions of the optically selective surface coating a mathematical model was developed, which takes the thermal emittances and the solar absorptances of the different surfaces into account. Furthermore, a full-size experiment was constructed to verify the theoretical predictions.

The coating results in a heat loss reduction of approximately 20 % in such a CPV/T system and one of the companies involved in the study is already changing their design to make use of the results.

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Gasti, Maria. "Techno-economic Appraisal of Concentrating Solar Power Systems (CSP)." Thesis, Högskolan Dalarna, Energi och miljöteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:du-12806.

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The diffusion of Concentrating Solar Power Systems (CSP) systems is currently taking place at a much slower pace than photovoltaic (PV) power systems. This is mainly because of the higher present cost of the solar thermal power plants, but also for the time that is needed in order to build them. Though economic attractiveness of different Concentrating technologies varies, still PV power dominates the market. The price of CSP is expected to drop significantly in the near future and wide spread installation of them will follow. The main aim of this project is the creation of different relevant case studies on solar thermal power generation and a comparison betwwen them. The purpose of this detailed comparison is the techno-economic appraisal of a number of CSP systems and the understanding of their behaviour under various boundary conditions. The CSP technologies which will be examined are the Parabolic Trough, the Molten Salt Power Tower, the Linear Fresnel Mirrors and the Dish Stirling. These systems will be appropriatly sized and simulated. All of the simulations aim in the optimization of the particular system. This includes two main issues. The first is the achievement of the lowest possible levelized cost of electricity and the second is the maximization of the annual energy output (kWh). The project also aims in the specification of these factors which affect more the results and more specifically, in what they contribute to the cost reduction or the power generation. Also, photovoltaic systems will be simulated under same boundary conditions to facolitate a comparison between the PV and the CSP systems. Last but not leats, there will be a determination of the system which performs better in each case study.
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Nguyen, Tam Thanh. "Concentrating Solar Thermal Energy Storage Using Amide-Hydride Systems." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/59669.

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Amide-hydride systems can be used in thermal storage systems by taking advantage of their endothermic/exothermic reactions with hydrogen. This allows the harnessing of concentrated solar energy by utilising thermal storage to alleviate its intermittent nature. Amide-hydride reactions have been widely studied for their low temperature applications. However, the high temperature imide-hydride reactions are more suitable for thermal energy storage. Lithium, magnesium and calcium-based amide-imide-hydride systems were investigated with potential candidates from systems containing calcium metal.
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Filatov, Artem. "Concentrating Collector for Torsång District Heating System." Thesis, Högskolan Dalarna, Energiteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:du-28539.

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In this thesis report for Dalarna University in Borlange and Absolicon company the study of a possibility to add an array of concentrating solar collectors to a Torsång district heating system was done. The whole idea of this work was to make a simulation of this kind of system, trying to get 15-20% of solar fraction, and make an economical evaluation. At the same time, another goal was to make two comparisons: between concentrating and flat-plate collector in the same system, and between two tools for collector analysis – Polysun and Absolicon tool, based on TRNSYS, which was designed to estimate the output of the collector for a certain temperature, without any load. During the study, the analysis of the simulating tools was made and the combination of those two tools was used. Using long iteration cycles, involving changing the field layout, number of collectors and distance between collector rows in flat-plate collector case, both types of collectors were analyzed. The method of the analysis was to get an equal output of the field and see the differences, which appear while using different collector types.
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Brogren, Maria. "Optical Efficiency of Low-Concentrating Solar Energy Systems with Parabolic Reflectors." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3988.

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Paul, Damasen Ikwaba. "Characterisation of solar concentrating systems for photovoltaics and their impact on performance." Thesis, University of Ulster, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.549700.

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The use of concentrating systems has a great potential to become the lowest-cost PV option if the high energy flux in the concentrated PV module can be utilised efficiently. In this study, a PV module with isolated cells was designed and fabricated with the purpose of examining the performance of each cell under concentrated (using CPC and V-trough) and non-concentrated light. Before the experimental characterisation, a detailed optical analysis for the CPC and V-trough collectors was undertaken. It was found that in spite of both concentrators having the same concentration ratio and aperture area, the angular acceptance and optical efficiency for the CPC were always higher than those of the V-trough for incidence angles above ± 20° and ± 10° , respectively. A comparison of flux distribution on the absorber of the two concentrators indicated that the energy flux was more uniform in the V -trough collector than in the CPC collector. The experimental energy flux concentration for the CPC collector (at normal incidence angle) varied from 0.9 to 3.6, with higher irradiance concentrated near the edges of the PV module. As a result, the CPC performed better with cells located near the edges of the PV module than those at the centre. On the other hand, the energy concentration for the V -trough collector varied from 1.3 to 2.5, with higher irradiance concentrated at the centre of the PV module. The use of the CPC and V-trough concentrators increased the power output of a PV module by 25% and 46%, respectively, compared to a similar non-concentrated PV module. The fabricated isolated cells PV module was used to evaluate, theoretically and experimentally, the energy flux distribution on the surface of a concentrated PV module under CPC and V -trough concentrators. From the analysis, it was found that in both collectors, the experimental optical efficiency (indoor and outdoor) results follow the theoretical ones with reasonable accuracy, especially the outdoor experimental results. The comparison between outdoor and indoor experimental optical efficiencies in each collector showed that there was good agreement between the two results, both for low and high incidence angles. The effects of non-uniform illumination on the performance of a single standard PV cell, at low and medium energy flux concentration ratios as well as the effect of orientation, size and geometrical shapes of non-uniform illumination were studied. It was found that the effect of non-uniform illumination on various cell performance parameters becomes noticeable at medium energy flux concentration ratio. The results also indicated that the performance of a single conventional PV cell depends neither on the location and size of the non-uniform illumination nor the geometrical shape of the non-uniform illumination. A novel hybrid PV cell consisting of low and high efficiency PV cells was designed and fabricated. The electrical energy produced by the hybrid cell was compared, theoretically and experimentally, with a similar low efficiency single PV (LESPV) cell in a low- concentrating symmetric CPC suitable for facade, sloping roof, flat roof and rear side building integration. Both results, simulation and experimental, showed that the daily electrical energy produced by a hybrid cell for different Belfast (UK) sky conditions was higher than that of the LESPV cell, but not to the expected value.
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Books on the topic "Concentrating systems"

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International Conference on Concentrating Photovoltaic Systems (6th 2010 Freiburg im Breisgau, Germany). 6th International Conference on Concentrating Photovoltaic Systems: CPV-6 ; Freiburg, Germany, 7-9 April 2010. Edited by Bett Andreas W. Melville, N.Y: American Institute of Physics, 2010.

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Spain) International Conference on Concentrating Photovoltaic Systems (8th 2012 Toledo. 8th International Conference on Concentrating Photovoltaic Systems: CPV-8, Toledo, Spain, 16-18 April 2012. Edited by Dimroth Frank, Rubio Francisca, and Antón Ignacio. Melville, N.Y: American Institute of Physics, 2012.

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International, Conference on Concentrating Photovoltaic Systems (7th 2011 Las Vegas Nev ). 7th International Conference on Concentrating Photovoltaic Systems: CPV-7, Las Vegas, Nevada, USA, 4-6 April 2011. Melville, N.Y: American Institute of Physics, 2011.

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Karathanasis, Stavros. Linear Fresnel Reflector Systems for Solar Radiation Concentration. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05279-9.

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Lütkebohmert, Eva. Concentration risk in credit portfolios. Berlin: Springer, 2009.

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Concentration risk in credit portfolios. Berlin: Springer, 2009.

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Ostermann, Dorinda R. Automated system to measure the carbonate concentration of sediments. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1990.

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Wendy, Pyper, and Statistics Canada. Analytical Studies Branch., eds. Permanent layoffs and displaced workers: Cyclical sensitivity, concentration and experience following the layoff. Ottawa, Ont: Analytical Studies Branch, Statistics Canada, 1993.

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Cecala, Andrew B. Reducing respirable dust concentrations at mineral processing facilities using total mill ventilation systems. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1993.

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Canada Centre for Mineral and Energy Technology. Optical diagnostic system for the measurement of gas temperature and species concentration. S.l: s.n, 1988.

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Book chapters on the topic "Concentrating systems"

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Rachid, Ahmed, Aytac Goren, Victor Becerra, Jovana Radulovic, and Sourav Khanna. "Concentrating Photovoltaics." In Power Systems, 69–81. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-20830-0_4.

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Alexopoulos, Spiros, and Bernhard Hoffschmidt. "Concentrating Receiver Systems concentrating receiver system (CRS) (Solar Power Tower) solar power tower." In Encyclopedia of Sustainability Science and Technology, 2349–91. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0851-3_677.

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Knepper, Mark A., and John L. Stephenson. "Urinary Concentrating and Diluting Processes." In Membrane Transport Processes in Organized Systems, 329–42. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-5404-8_16.

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Alexopoulos, Spiros, and Bernhard Hoffschmidt. "Concentrating Receiver Systems (Solar Power Tower)." In Encyclopedia of Sustainability Science and Technology, 1–49. New York, NY: Springer New York, 2021. http://dx.doi.org/10.1007/978-1-4939-2493-6_677-3.

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Alexopoulos, Spiros, and Bernhard Hoffschmidt. "Concentrating Receiver Systems (Solar Power Tower)." In Encyclopedia of Sustainability Science and Technology Series, 63–110. New York, NY: Springer US, 2022. http://dx.doi.org/10.1007/978-1-0716-1422-8_677.

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Alexopoulos, Spiros, and Bernhard Hoffschmidt. "Concentrating Receiver Systems (Solar Power Tower)." In Solar Energy, 29–71. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5806-7_677.

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Monti, Jaime M., Seithikurippu R. Pandi-Perumal, and Pablo Torterolo. "The Effects of Melanin-Concentrating Hormone on Neurotransmitter Systems Involved in the Generation and Maintenance of Wakefulness." In Melanin-Concentrating Hormone and Sleep, 109–20. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75765-0_5.

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Utamura, Motoaki, Yutaka Tamaura, Minoru Yuasa, Rina Kajita, and Takashi Yamamoto. "Optimal Heliostat Layout for Concentrating Solar Tower Systems." In Challenges of Power Engineering and Environment, 1196–201. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-76694-0_223.

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Bowes, George, and Julia B. Reiskind. "Inorganic Carbon Concentrating Systems from an Environmental Perspective." In Progress in Photosynthesis Research, 345–52. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-0519-6_72.

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Mir-Artigues, Pere, Pablo del Río, and Natàlia Caldés. "Concentrating Solar Power Technologies: Solar Field Types and Additional Systems." In The Economics and Policy of Concentrating Solar Power Generation, 7–22. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-11938-6_2.

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Conference papers on the topic "Concentrating systems"

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Duerr, Fabian, Buvaneshwari Muthirayan, Youri Meuret, and Hugo Thienpont. "Benchmarking concentrating photovoltaic systems." In SPIE Solar Energy + Technology, edited by Neelkanth G. Dhere, John H. Wohlgemuth, and Kevin Lynn. SPIE, 2010. http://dx.doi.org/10.1117/12.860554.

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Mittleman, Gur, Abraham Kribus, and Abraham Dayan. "Cogeneration With Concentrating Photovoltaic Systems." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76129.

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Simultaneous production of electrical and high-grade thermal energy is proposed with a Concentrating Photovoltaic/Thermal (CPVT) system operating at elevated temperature. The CPVT may operate at temperatures above 100°C and the thermal energy can drive processes such as refrigeration, desalination, and steam production. An example of CPVT with single-effect absorption cooling is investigated in detail. The results show that under a wide range of economic conditions, the combined solar cooling and power generation plant can be comparable and sometimes even significantly better than the conventional alternative.
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Beaudry, Edward G., and John R. Herron. "Direct Osmosis for Concentrating Wastewater." In International Conference On Environmental Systems. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1997. http://dx.doi.org/10.4271/972270.

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Zhou, Zhiguang, Yubo Sun, Xingshu Sun, Muhammad Ashraful Alam, Peter Bermel, and Xin Jin. "Radiative cooling for concentrating photovoltaic systems." In Thermal Radiation Management for Energy Applications, edited by Mowafak M. Al-Jassim and Peter Bermel. SPIE, 2017. http://dx.doi.org/10.1117/12.2273916.

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Cazzaniga, R., Marco Rosa-Clot, Paolo Rosa-Clot, and Giuseppe M. Tina. "Floating tracking cooling concentrating (FTCC) systems." In 2012 IEEE 38th Photovoltaic Specialists Conference (PVSC). IEEE, 2012. http://dx.doi.org/10.1109/pvsc.2012.6317668.

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Sweatt, William, Greg Nielson, and Murat Okandan. "Concentrating Photovoltaic Systems Using Micro-Optics." In Optics for Solar Energy. Washington, D.C.: OSA, 2011. http://dx.doi.org/10.1364/ose.2011.srwc6.

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Krüger, Dirk, Stephan Fischer, Tobias Hirsch, and Javier Iñigo Labairu. "Concentrating solar systems in moderate climates." In SOLARPACES 2020: 26th International Conference on Concentrating Solar Power and Chemical Energy Systems. AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0085792.

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Goettsche, Joachim, Bernhard Hoffschmidt, Stefan Schmitz, Markus Sauerborn, Reiner Buck, Edgar Teufel, Kathrin Badstu¨bner, David Ifland, and Christian Rebholz. "Solar Concentrating Systems Using Small Mirror Arrays." In ASME 2008 2nd International Conference on Energy Sustainability collocated with the Heat Transfer, Fluids Engineering, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/es2008-54347.

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The cost of solar tower power plants is dominated by the heliostat field making up roughly 50% of investment costs. Classical heliostat design is dominated by mirrors brought into position by steel structures and drives that guarantee high accuracies under wind loads and thermal stress situations. A large fraction of costs is caused by the stiffness requirements of the steel structure, typically resulting in ∼20 kg/m2 steel per mirror area. The typical cost figure of heliostats is currently in the area of 150 €/m2 caused by the increasing price of the necessary raw materials. An interesting option to reduce costs lies in a heliostat design where all moving parts are protected from wind loads. In this way, drives and mechanical layout may be kept less robust thereby reducing material input and costs. In order to keep the heliostat at an appropriate size, small mirrors (around 10 cm × 10 cm) have to be used which are placed in a box with transparent cover. Innovative drive systems are developed in order to obtain a cost-effective design. A 0.5 m × 0.5 m demonstration unit will be constructed. Tests of the unit are carried out with a high-precision artificial sun unit that imitates the sun’s path with an accuracy of less than 0.5 mrad and creates a beam of parallel light with divergence less than 4 mrad.
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Han, Xue, Chao Xu, Xing Ju, Xiaoze Du, and Gaosheng Wei. "Parameter optimization of a hybrid solar concentrating photovoltaic/concentrating solar power (CPV/CSP) system." In SOLARPACES 2016: International Conference on Concentrating Solar Power and Chemical Energy Systems. Author(s), 2017. http://dx.doi.org/10.1063/1.4984367.

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Rubio, Francisca, I. Antón, K. Araki, A. W. Bett, F. Dimroth, S. Kurtz, B. McConnell, and G. Sala. "Preface: 8th International Conference on Concentrating Photovoltaic Systems." In 8TH INTERNATIONAL CONFERENCE ON CONCENTRATING PHOTOVOLTAIC SYSTEMS: CPV-8. AIP, 2012. http://dx.doi.org/10.1063/1.4753820.

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Reports on the topic "Concentrating systems"

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Armijo, Kenneth Miguel, and Subhash L. Shinde. Heat Transfer Phenomena in Concentrating Solar Power Systems. Office of Scientific and Technical Information (OSTI), November 2016. http://dx.doi.org/10.2172/1431196.

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Augustine, Chad, Parthiv Kurup, Mark Mehos, and Ty Neises. FY19-FY21 Concentrating Solar Power Systems Analysis Final Report. Office of Scientific and Technical Information (OSTI), January 2023. http://dx.doi.org/10.2172/1923360.

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Zidan, Ragaiy, B. J. Hardy, C. Corgnale, J. A. Teprovich, P. Ward, and Ted Motyka. Low-Cost Metal Hydride Thermal Energy Storage System for Concentrating Solar Power Systems. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1340197.

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Moore, Robert Charles, Nathan Phillip Siegel, Gregory J. Kolb, Milton E. Vernon, and Clifford Kuofei Ho. Design considerations for concentrating solar power tower systems employing molten salt. Office of Scientific and Technical Information (OSTI), September 2010. http://dx.doi.org/10.2172/1008140.

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Peters, E. M., and J. D. Masso. Manufacturing injection-moleded Fresnel lens parquets for point-focus concentrating photovoltaic systems. Office of Scientific and Technical Information (OSTI), October 1995. http://dx.doi.org/10.2172/120927.

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Kaplan, S. I. Determination of effects of atmospheric contamination on photovoltaic cells in concentrating systems. Office of Scientific and Technical Information (OSTI), December 1986. http://dx.doi.org/10.2172/6912463.

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J Fong, E., N. Hum, K. Martin, M. Shusteff, and G. Loots. Extracellular Shed Vesicle Isolation - InnovaPrep® Concentrating Pipette, Ultracentrifugation, and Systems Biosciences ExoQuick®. Office of Scientific and Technical Information (OSTI), October 2018. http://dx.doi.org/10.2172/1599560.

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Michael Schuller, Frank Little, Darren Malik, Matt Betts, Qian Shao, Jun Luo, Wan Zhong, Sandhya Shankar, and Ashwin Padmanaban. Molten Salt-Carbon Nanotube Thermal Energy Storage for Concentrating Solar Power Systems Final Report. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1036948.

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Faghri, Amir, and Ranga Pitchumani. Research and Development for Novel Thermal Energy Storage Systems (TES) for Concentrating Solar Power (CSP). Office of Scientific and Technical Information (OSTI), September 2013. http://dx.doi.org/10.2172/1094976.

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Schlossnagle, Trevor H., Janae Wallace,, and Nathan Payne. Analysis of Septic-Tank Density for Four Communities in Iron County, Utah - Newcastle, Kanarraville, Summit, and Paragonah. Utah Geological Survey, December 2022. http://dx.doi.org/10.34191/ri-284.

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Abstract:
Iron County is a semi-rural area in southwestern Utah that is experiencing an increase in residential development. Although much of the development is on community sewer systems, many subdivisions use septic tank soil-absorption systems for wastewater disposal. Many of these septic-tank systems overlie the basin-fill deposits that compose the principal aquifer for the area. The purpose of our study is to provide tools for waterresource management and land-use planning. In this study we (1) characterize the water quality of four areas in Iron County (Newcastle, Kanarraville, Summit, and Paragonah) with emphasis on nutrients, and (2) provide a mass-balance analysis based on numbers of septic-tank systems, groundwater flow available for mixing, and baseline nitrate concentrations, and thereby recommend appropriate septic-system density requirements to limit water-quality degradation. We collected 57 groundwater samples and three surface water samples across the four study areas to establish baseline nitrate concentrations. The baseline nitrate concentrations for Newcastle, Kanarraville, Summit, and Paragonah are 1.51 mg/L, 1.42 mg/L, 2.2 mg/L, and 1.76 mg/L, respectively. We employed a mass-balance approach to determine septic-tank densities using existing septic systems and baseline nitrate concentrations for each region. Nitrogen in the form of nitrate is one of the principal indicators of pollution from septic tank soil-absorption systems. To provide recommended septic-system densities, we used a mass-balance approach in which the nitrogen mass from projected additional septic tanks is added to the current nitrogen mass and then diluted with groundwater flow available for mixing plus the water added by the septic-tank systems themselves. We used an allowable degradation of 1 mg/L with respect to nitrate. Groundwater flow volume available for mixing was calculated from existing hydrogeologic data. We used data from aquifer tests compiled from drinking water source protection documents to derive hydraulic conductivity from reported transmissivities. Potentiometric surface maps from existing publications and datasets were used to determine groundwater flow directions and hydraulic gradients. Our results using the mass balance approach indicate that the most appropriate recommended maximum septic-tank densities in Newcastle, Kanarraville, Summit, and Paragonah are 23 acres per system, 7 acres per system, 5 acres per system, and 11 acres per system, respectively. These recommendations are based on hydrogeologic parameters used to estimate groundwater flow volume. Public valley-wide sewer systems may be a better alternative to septic-tank systems where feasible.
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