Reflective optics for redirecting convergent radiative beams in concentrating solar applications

Li, Lifeng; Wang, Bo; Bader, Roman; Zapata, José; Lipiński, Wojciech

doi:10.1016/j.solener.2019.08.077

Cited by 12 publications

(3 citation statements)

References 30 publications

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“…We determined the optimal half-opening angle β of the radiation shield (see Fig. 2A ) to optimize the nonlinear interplay of

and

by using a geometrical raytracing model ( 61 ), accounting for experimental constraints such as the emitter spectral emissivity ε sample (λ), shield height H, base radius r , and a range of values of Mylar reflectivity R (see the Supplementary Materials and fig. S1).…”

Section: Resultsmentioning

confidence: 99%

Exploiting radiative cooling for uninterrupted 24-hour water harvesting from the atmosphere

et al. 2021

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Atmospheric water vapor is ubiquitous and represents a promising alternative to address global clean water scarcity. Sustainably harvesting this resource requires energy neutrality, continuous production, and facility of use. However, fully passive and uninterrupted 24-hour atmospheric water harvesting remains a challenge. Here, we demonstrate a rationally designed system that synergistically combines radiative shielding and cooling—dissipating the latent heat of condensation radiatively to outer space—with a fully passive superhydrophobic condensate harvester, working with a coalescence-induced water removal mechanism. A rationally designed shield, accounting for the atmospheric radiative heat, facilitates daytime atmospheric water harvesting under solar irradiation at realistic levels of relative humidity. The remarkable cooling power enhancement enables dew mass fluxes up to 50 g m−2 hour−1, close to the ultimate capabilities of such systems. Our results demonstrate that the yield of related technologies can be at least doubled, while cooling and collection remain passive, thereby substantially advancing the state of the art.

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“…We determined the optimal half-opening angle β of the radiation shield (see Fig. 2A ) to optimize the nonlinear interplay of

and

Section: Resultsmentioning

confidence: 99%

Exploiting radiative cooling for uninterrupted 24-hour water harvesting from the atmosphere

et al. 2021

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“…Additional concentration is likely required to concentrate reduce dilution [65]. The reflectors may consist of flat, ellipsoidal, hyperboloidal or paraboloidal reflectors [66] or may consist of multiple apertures [67]. In this case, the cost of the support for the reflector and additional complexity should compensate for the added benefit [68].…”

Section: Advances In Heliostat Layoutsmentioning

confidence: 99%

Concentrating Solar Power Advances in Geometric Optics, Materials and System Integration

Arnaoutakis

Katsaprakakis

2021

Energies

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In this paper, the technological advances in concentrating solar power are reviewed. A comprehensive system approach within this scope is attempted to include advances of highly specialized developments in all aspects of the technology. Advances in geometric optics for enhancement in solar concentration and temperature are reviewed along with receiver configurations for efficient heat transfer. Advances in sensible and latent heat storage materials, as well as development in thermochemical processes, are also reviewed in conjunction with efficient system integration as well as alternative energy generation technologies. This comprehensive approach aims in highlighting promising concentrating solar power components for further development and wider solar energy utilization.

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“…The surface shape of the reflector can be purposefully designed and optimized to achieve functions such as collimation, focusing, or magnification. For instance, parabolic and elliptical reflectors are popular components that used mostly in optical systems [10] that allow to be engineered to collimate or focus light, respectively, with the lamp positioned at the focal point of the reflector as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

Characterization of high aspect ratio miniature reflectors using negative shape polymer filling and image processing

Labib,

Eid,

Erfan

et al. 2024

Photonic Instrumentation Engineering XI

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Optical reflectors are essential components used in spectroscopy applications that require high-intensity and uniform sample illumination. Typically, reflector parameters such as curvature and dimensions are optimized to ensure efficient light direction from filament lamps to the sample under test. Elliptical reflectors are often used to collect all the light emitted from one focus and direct it to the other. However, the curvature of miniature reflectors can be challenging to evaluate using standard measurement tools and methods due to its high aspect ratio, which can present mechanical and optical limitations when trying to access and scan it. In this work, we report a characterization procedure to evaluate the different optical and dimensional parameters of a fabricated miniature elliptical reflector with a high aspect ratio of width to depth. We compare two fabrication methods, Plastic Molding, and Diamond Turning, to assess their effectiveness. The reflector's curvature is characterized using the negative shape filling method, where melted polymer is used to fill the reflector and allowed to cool until solidified, resulting in a negative convex shape of the reflector. The reflector's curvature is then calculated by fitting the shape to the appropriate elliptical function using image processing. This method shows good accuracy in evaluating the reflector's curvature. Furthermore, the reflector's optical performance and illumination spot are characterized by imaging the spot onto a target screen and detector, validating the good performance achieved with low-cost plastic molded reflectors compared to DT reflectors. The image quality and optical power identify surface roughness and coating quality, where the molded reflectors show better results compared to the DT reflector.

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Reflective optics for redirecting convergent radiative beams in concentrating solar applications

Cited by 12 publications

References 30 publications

Exploiting radiative cooling for uninterrupted 24-hour water harvesting from the atmosphere

Exploiting radiative cooling for uninterrupted 24-hour water harvesting from the atmosphere

Concentrating Solar Power Advances in Geometric Optics, Materials and System Integration

Characterization of high aspect ratio miniature reflectors using negative shape polymer filling and image processing

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