Journal ArticleDOI
Concentrated solar energy applications using Fresnel lenses: A review
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TLDR
In this article, the authors make a review about the recent development of the concentrated solar energy applications using Fresnel lenses and make a comparison between imaging and non-imaging systems.Abstract:
Solar energy concentration technology using Fresnel lens is an effective way to make full use of sunlight. This paper makes a review about the recent development of the concentrated solar energy applications using Fresnel lenses. The ongoing research and development involves imaging systems and non-imaging systems. Compared with imaging systems, non-imaging systems have the merits of larger accept angles, higher concentration ratios with less volume and shorter focal length, higher optical efficiency, etc. Concentrated photovoltaics is a major application and the highest solar-to-electric conversion efficiency based on imaging Fresnel lens and non-imaging Fresnel lens are reported as over 30% and 31.5 ± 1.7%, respectively. Moreover, both kinds of systems are widely used in other fields such as hydrogen generation, photo-bio reactors as well as photochemical reactions, surface modification of metallic materials, solar lighting and solar-pumped laser. During the recent two decades, such applications have been built and tested successfully to validate the practicality of Fresnel lens solar concentration systems. Although the present application scale is small, the ongoing research and development works suggest that Fresnel lens solar concentrators, especially non-imaging Fresnel lenses, will bring a breakthrough of commercial solar energy concentration application technology in the near future. Finally, the advantages and disadvantages of two systems are also summarized.read more
Citations
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Flexible and Salt Resistant Janus Absorbers by Electrospinning for Stable and Efficient Solar Desalination
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Concentrating Solar Power.
Lee A. Weinstein,James Loomis,James Loomis,Bikram Bhatia,David M. Bierman,Evelyn N. Wang,Gang Chen +6 more
TL;DR: In this paper, the Advanced Research Projects Agency-Energy (ARPA-Energy) gave DE-AR0000471 and DE-ARM0000181 for the first time, respectively.
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A comprehensive review of state-of-the-art concentrating solar power (CSP) technologies: current status and research trends
TL;DR: It is found that direct steam generation (DSG) is a promising innovation which is reviewed in this study and provides a most up-to-date overview of the CSP technologies implemented across the globe.
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Photocatalytic Water Splitting—The Untamed Dream: A Review of Recent Advances
TL;DR: Future directions are focused on developing innovative junction architectures, novel synthesis methods and optimizing the existing active materials to enhance charge transfer, visible light absorption, reducing the gas evolution overpotential and maintaining chemical and physical stability.
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Hydrogen Production from Semiconductor-based Photocatalysis via Water Splitting
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References
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Solar thermal collectors and applications
TL;DR: A survey of the various types of solar thermal collectors and applications is presented in this paper, where an analysis of the environmental problems related to the use of conventional sources of energy is presented and the benefits offered by renewable energy systems are outlined.
Journal ArticleDOI
Probing momentum distributions in magnetic tunnel junctions via hot-electron decay
TL;DR: In this article, the authors investigated the tunnel momentum distribution in a magnetic tunnel junction by analyzing the decay of the hot electrons in the Co metal anode after tunneling, using a three-terminal transistor structure.
Journal ArticleDOI
Multi-junction III-V solar cells: current status and future potential
TL;DR: In this paper, a 3-junction InGaP/InGaAs/Ge concentrator solar cell with an efficiency of 37.4% (AM1.5G, 200-suns) has been fabricated.
Journal ArticleDOI
On the influence of bandstructure on transport properties of magnetic tunnel junctions with Co2Mn1−xFexSi single and multilayer electrode
Jan-Michael Schmalhorst,Daniel Ebke,Alexander Weddemann,Andreas Hütten,Andy Thomas,Günter Reiss,Andrey Turchanin,Armin Gölzhäuser,Benjamin Balke,Claudia Felser +9 more
Abstract: The transport properties of magnetic tunnel junctions with different (110)-textured Heusler alloy electrodes such as Co2MnSi, Co2FeSi or Co2Mn0.5Fe0.5Si, AlOx barrier, and Co–Fe counterelectrode are investigated. The bandstructure of Co2Mn1−xFexSi is predicted to show a systematic shift in the position of the Fermi energy EF through the gap in the minority density of states while the composition changes from Co2MnSi toward Co2FeSi. Although this shift is indirectly observed by x-ray photoemission spectroscopy, all junctions show a large spin polarization of around 70% at the Heusler alloy/Al–O interface and are characterized by a very similar temperature and bias voltage dependence of the tunnel magnetoresistance. This suggests that these transport properties of these junctions are dominated by inelastic excitations and not by the electronic bandstructure.
Journal ArticleDOI
Compact Linear Fresnel Reflector solar thermal powerplants
David R. Mills,Graham Morrison +1 more
TL;DR: In this paper, the Compact Linear Fresnel Reflector (CLFR) concept was evaluated for large scale solar thermal electricity generation plants and different versions of the basic CLFR concept that are evaluated include absorber orientation, absorber structure, the use of secondary reflectors adjacent to the absorbers, reflector field configurations, mirror packing densities, and receiver heights.