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Concentrators Two Stage
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(PDF) Optics of two-stage photovoltaic concentrators with …
Optics of two-stage photovoltaic concentrators with dielectric second stages. Joseph O'Gallagher. 1987, Applied Optics. See Full PDF Download PDF.
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Second-stage concentrators—a new formalism
As limit had been postulated and various ideal two-dimensional (2D) optical designs have already been suggested. 2- 6 Ideal the entendue, in turn, uniquely determines the ideal exit aperture of a concentrator,1 0 the expression for aid is the same second-stage concentrators form a special case of ideal con- as for a real source [Eq.
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Etendue-matched two-stage concentrators with multiple …
One possible way to minimize these losses is to intersect two focusing Fresnel concentrators forming a Compact Linear Fresnel Reflector – CLFR. Although improving on a simple focusing Fresnel ...
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Contactless efficient two-stage solar concentrator for tubular …
The design of a new type of two-mirror solar concentrator for a tubular receiver, the XX concentrator, is presented, which has a sizable gap between the …
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Compact high-flux two-stage solar collectors based on tailored edge …
This is still about a factor of 3 superior to the corresponding CPC design at this field rim angle. 5. SUMMARY A new strategy has been developed here for efficiently reaching high flux levels in compact two-stage solar concentrators. Flux concentration as high as 90% of the thermodynamic limit can now be achieved at f-numbers as low as 0.47.
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Etendue-matched two-stage concentrators with multiple …
A possible way to concentrate sun light is by using a Fresnel reflector: a large number of small mirrors (called heliostats) that mimic the behavior of a large concentrator, replacing it. These heliostats can move to track the sun, keeping its light concentrated onto the receiver. Fresnel concentrators, however, may have important losses.
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(PDF) Contactless efficient two-stage solar concentrator for …
Contactless efficient two-stage solar concentrator for tubular absorber. Pablo Benitez. 1997, Applied Optics. The design of a new type of two-mirror solar concentrator for a …
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New high-flux two-stage optical designs for parabolic solar concentrators
The U.S. Department of Energy's Office of Scientific and Technical Information
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Two-stage concentrators for solar bimodal power and …
Abstract. A solar bimodal system provides both electrical power for an on-orbit operation and high-performance thermal propulsion capability for an orbital transfer. …
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A TWO-STAGE PHOTOVOLTAIC CONCENTRATOR WITH A …
Two-stage nonimaging concentrators [1] employing fresnel lenses as the pri maries and dielectric totally internally reflecting concentrators (DTIRC) [2] as the …
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Contactless two-stage solar concentrators for tubular …
Two new types of two-mirror solar concentrator for tubular receiver, the snail concentrator and the helmet concentrator, are presented. The main feature of these concentrators is that they have a sizable gap between the secondary mirror and the absorber, and they still achieve concentrations close to the thermodynamic limit with high …
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Two-stage tilting solar concentrators
In this paper a novel type of two-stage non-focussing concentrator is described which makes economic photovoltaic and thermal solar conversion possible at current prices in many locations. The new concentrators use exceptionally little mirror (1.3–1.8 times full aperture), yet achieve concentrations up to 12 × without diurnal tracking.
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A review of state-of-the-art reflective two-stage solar concentrators …
Additionally, two-stage solar concentrators (TSSCs) are well-known for high solar power at medium to high temperature, efficient power delivery, as well as, compactness and modularity in deployment. A typical reflective TSSC consists of three components: a primary mirror, a secondary mirror, and a receiver (Fig. 1).
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Design considerations for leaf-inspired luminescent solar concentrators …
Request PDF | On Oct 4, 2023, Hiroto Nishimura and others published Design considerations for leaf-inspired luminescent solar concentrators based on two-stage photoconversion | Find, read and cite ...
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Stage Concentrator
Besides, two-stage concept is also used in concentrated photovoltaic systems. Ning et al. [94] investigated the two-stage photovoltaic concentrators with Fresnel lenses as primaries and dielectric internally reflecting non-imaging concentrators as secondaries, which presented the general design principles of such two-stage systems. Their ...
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Analysis of a Two-Stage Linear Fresnel Reflector Solar Concentrator
The two-stage linear Fresnel reflector solar concentrator is analyzed via an in-depth study of an installed, nominally 220 KWt system. The concentrator includes: (1) a primary linear Fresnel reflector comprised of curved mirrors and (2) a secondary nonimaging CPC-type trough with a tubular receiver. The principal practical design …
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Solved The first stage of a two-stage solar hot water system …
The first stage of a two-stage solar hot water system uses a flat plate collector to heat water from an ambient temperature of 17oC to a temperature of 55oC. The second stage of the system employs solar concentrators to further heat the water to a working (steam) temperature of 462oC. (NB oC = degree Celsius)
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A two-stage solar photobioreactor for cultivation of microalgae …
A novel two-stage experimental photobioreactor (PBR) with a total volume of 450L and based uniquely on solar concentrators—linear Fresnel lenses—has been constructed and tested.
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A method for global potential assessment of roof integrated two-stage …
This paper proposes a core method for integrating two-stage solar concentrators (TSSCs) as roof-integrated energy supply systems at the district scale. ... Among several designs, a two-stage solar concentrator (TSSC) comprising primary and secondary mirrors and a receiver [5] (Fig. 1) are a viable option, due to features i.e., …
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Analysis of a two-stage linear Fresnel reflector solar …
The two-stage Fresnel concentrator can be considerably less expensive than the corresponding parabolic trough collector, but is found to deliver about one-fourth …
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Leaf-inspired luminescent solar concentrator based on two-stage …
Geometrical gain of a luminescent solar concentrator is drastically increased by laying out a luminescent fiber in a luminescent plate with air gap around it and attaching a photovoltaic (PV) cell to the tip of the fiber. The plate converts an incident photon to a first photoluminescence (PL) photon, and the fiber converts it to a second PL photon. Thus, …
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Optics of two-stage photovoltaic concentrators with …
Two-stage photovoltaic concentrators with Fresnel lenses as primaries and dielectric totally internally reflecting nonimaging concentrators as secondaries are discussed. The general design principles of such two-stage systems are given. Their optical properties are studied and analyzed in detail using computer ray trace procedures.
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A two-stage solar photobioreactor for cultivation of microalgae …
A novel two-stage experimental photobioreactor (PBR) with a total volume of 450 L and based uniquely on solar concentrators—linear Fresnel lenses—has been constructed and tested. Daily courses of irradiance, and also its distribution inside cultivation tubes, were studied in two unit types. The supra-high irradiance units in the …
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Two-stage solar concentrators based on parabolic troughs: …
While nonimaging concentrators can approach the thermodynamic limit of concentration, they generally suffer from poor compactness when designed for small acceptance angles, e.g., to capture direct solar irradiation. Symmetric two-stage systems utilizing an image-forming primary parabolic concentrator in tandem with a nonimaging secondary …
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(PDF) Optics of two-stage photovoltaic concentrators with …
Optics of two-stage photovoltaic concentrators with dielectric second stages
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Spiral Concentrator
SX4 Coal Spiral Concentrators – Assemblies supplied in single, twin or triple starts with 4 revolutions utilising a high capacity 1 000-mm diameter trough. SX7 & MX7 Multi Stage Coal Spiral Concentrators – Incorporating two stages of spiralling into a single assembly with auto rejection channel and gully. What Multotec offers:
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Two-stage tilting solar concentrators
A two-stage non-refractive thermal concentrator for a tubular absorber. A near-ideal EAC used for a second stage. Two-stage tilting solar concentrators 507 i 1-0 g .7 .u_ .6 g 4. .2 .1 T I or th ConcentrQtor nFg2 tRadaonAngt. I 0o 5 10o 15 incoming Roy Direction O Fig. 3.
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(PDF) Two-stage solar concentrators based on …
metric two-stage concentrators has not yet been reported in the. literature, and is this the focus of this work. Section 2 is devoted. to the derivation of the theoretical concentration limits for.
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6 Best Home Oxygen Concentrators of 2024
Inogen At Home 5L. •. Operates at 275 watts. •. Range of flow settings 1 to 5. 844-570-9907 Check Price. If you have a chronic respiratory condition—such as asthma, chronic obstructive pulmonary disease (COPD), lung disease, or obstructive sleep apnea (OSA) —you may not receive enough oxygen.
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9 Best Portable Oxygen Concentrators of 2024: Our Expert …
A quick look at the best portable oxygen concentrators in 2024. Inogen One G5: Most Discreet. CAIRE Freestyle Comfort: Best Battery Life. Respironics SimplyGo: Best Continuous and Pulse Flow. Inogen One G4: Most Portable. CAIRE SeQual Eclipse 5: Highest Oxygen Output. Philips Respironics SimplyGo Mini: Easiest to Use.
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New high-flux two-stage optical designs for parabolic solar
Abstract. We present a new two-stage optical design for parabolic dish concentrators that can realistically attain close to 90% of the thermodynamic limit to concentration with practical, compact designs (e.g., at parabola rim half-angles of around 45°). For comparison, the parabolic dish-plus-compound parabolic concentrator …
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Two-stage concentrators for solar bimodal power …
This paper is devoted to an analysis and comparison of concentrator-receiver system efficiency for one- and two-stage solar concentrators. A new computer code TANDEM for calculating the …
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A method for design optimization of roof-integrated two-stage …
Download Citation | On Jan 1, 2024, Nayab Bushra and others published A method for design optimization of roof-integrated two-stage solar concentrators (TSSCs) | Find, read and cite all the ...
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Optical characterization of two-stage non-imaging solar concentrator
An optical fiber daylighting system consisting of plastic modified compound parabolic concentrators (M-CPCs) and a dual-axis sun-tracking system of less than 3˚ angular tolerance was designed, studied and optimized by Vu and Shin in 2016 ... Conceptual layout design of the two-stage non-imaging solar concentrator (2S-NISC) …
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A novel non-confocal two-stage dish concentrating …
According to Bushra's classification [29], the NTPD-CPVT system is a low-concentration-ratio dish system, even though the concentration ratio is higher than most two-stage trough systems.In the investment scope of solar cells, a relatively large concentrating spot reduces the design difficulty of heat sinks and parasitic load caused …
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New high-flux two-stage optical designs for parabolic solar
DOI: 10.1016/0038-092X(93)90144-D Corpus ID: 122857563; New high-flux two-stage optical designs for parabolic solar concentrators @article{Friedman1993NewHT, title={New high-flux two-stage optical designs for parabolic solar concentrators}, author={Robert P. Friedman and Jeffrey M. Gordon and Harald Ries}, journal={Solar …
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A review of state-of-the-art reflective two-stage solar concentrators …
Evidently, two-stage dish concentrators require high manufacturing skills. In many TSSC designs, there is a trade-off between architectural complexity and high level of energy concentration. Therefore, oftentimes two-stage troughs are preferred solution when medium to high optical efficiencies, simple geometries and less manufacturing skills ...
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A method for design optimization of roof-integrated two …
Among several advanced technologies, two-stage solar concentrators (TSSCs) (employing two mirrors to focus sunlight on a receiver) have significant …
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A method for global potential assessment of roof integrated two-stage …
However, cassegrains have higher CR than two-stage trough, and simpler geometry than two-stage dish or solar furnace [5]. Further, cassegrains utilize fewer solar cells (77 %), than one-stage concentrators [6]. However, only a few studies reported cassegrains, as concentrating thermo-photovoltaics in buildings [17], [18], [29], [35].
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Optical characterization of two-stage non-imaging solar …
Specifications for the design of the two-stage concentrator were: (1) the primary stage concentrator was a 10-in. diameter Fresnel lens; (2) solar tolerance angle or the half-angle of acceptance ...