Bio-inspired thin and flat solar concentrator for efficient, wide acceptance angle light collection

2014 ◽  
Vol 53 (2) ◽  
pp. 306 ◽  
Author(s):  
Rabin Dhakal ◽  
Jiwon Lee ◽  
Jaeyoun Kim
Keyword(s):  
Solar Concentrator ◽  
Light Collection ◽  
Acceptance Angle ◽  
Wide Acceptance

A New Troughlike Nonimaging Solar Concentrator

2001 ◽  
Vol 124 (1) ◽  
pp. 51-54 ◽  
Author(s):  
Eduardo A. Rinco´n ◽  
Fidel A. Osorio
Keyword(s):  
Concentration Ratio ◽  
Glass Tube ◽  
Two Dimensional ◽  
Solar Concentrator ◽  
Steam Generation ◽  
Acceptance Angle ◽  
Practical Applications ◽  
Optimal Shapes ◽  
Heating Steam ◽  
East West

A new two-dimensional concentrator for solar energy collection has been developed. The concentrator has the following advantages, when compared with the classic Compound Parabolic Concentrators invented by Roland Winston, W. T. Welford, A. Rabl, Baranov, and other researchers: 1) It allows the use of parabolic mirrors, which have a reflecting area much smaller for a given concentration ratio and acceptance angle. 2) Between the mirror and the absorber, there is a large gap so that conduction losses are reduced. Convection losses can be reduced, too, if the absorber is enclosed within a glass tube. 3) It can be easily manufactured. Instead of seeking the shape of the mirrors for a given shape of the absorber, we have made the inverse statement of the problem, and we have obtained the optimal shapes of the absorbers with a prescribed acceptance angle, for parabolic mirrors, assuming that the intercept factor is unity, the mirrors are perfect, and the absorber surfaces are convex. The concentrator should be east-west oriented, and could be seasonal or monthly tilt adjusted. This concentrator could have many practical applications, such as fluid heating, steam generation, etc.

scholarly journals Design and Fabrication of Absorptive/Reflective Crossed CPC PV/T System

Designs ◽  
2018 ◽  
Vol 2 (3) ◽  
pp. 29
Author(s):  
Muhsin Aykapadathu ◽  
Mehdi Nazarinia ◽  
Nazmi Sellami
Keyword(s):  
Numerical Control ◽  
Solar Concentrator ◽  
Cnc Milling ◽  
Acceptance Angle ◽  
Optical Efficiency ◽  
Compound Parabolic Concentrator ◽  
Building Integrated Photovoltaic ◽  
New Generation ◽  
Experimental Rig ◽  
T System

A crossed compound parabolic concentrator (CCPC) is a non-imaging concentrator which is a modified form of a circular 3D compound parabolic concentrator (CPC) obtained by orthogonal intersection of two 2D CPCs that have an optical efficiency in line with that of 3D CPC. The present work is about the design and fabrication of a new generation of solar concentrator: the hybrid photovoltaic (PV)/thermal absorptive/reflective CCPC module. The module has a 4× CCPC structure truncated to have a concentration of 3.6× with a half acceptance angle of 30°. Furthermore, an experimental rig was also fabricated to test the performance of the module and its feasibility in real applications such as building-integrated photovoltaic (BIPV). 3D printing and Computer Numerical Control (CNC) milling technologies were utilized to manufacture the absorber and reflective parts of the module.

scholarly journals Monte Carlo Ray-Tracing Simulation of a Cassegrain Solar Concentrator Module for CPV

2021 ◽  
Vol 9 ◽  
Author(s):  
Seung Jin Oh ◽  
Hyungchan Kim ◽  
Youngsun Hong
Keyword(s):  
Monte Carlo ◽  
Ray Tracing ◽  
Concentration Ratio ◽  
Collection Efficiency ◽  
Focal Length ◽  
Tracking Error ◽  
Target Area ◽  
Solar Concentrator ◽  
Acceptance Angle ◽  
Energy Applications

The concentration ratio is one of the most important characteristics in designing a Cassegrain solar concentrator since it directly affects the performance of high-density solar energy applications such as concentrated photovoltaics (CPVs). In this study, solar concentrator modules that have different configurations were proposed and their performances were compared by means of a Monte Carlo ray-tracing algorithm to identify the optimal configurations. The first solar concentrator design includes a primary parabolic concentrator, a parabolic secondary reflector, and a homogenizer. The second design, on the other hand, includes a parabolic primary concentrator, a secondary hyperbolic concentrator, and a homogenizer. Two different reflectance were applied to find the ideal concentration ratio and the actual concentration ratio. In addition, uniform rays and solar rays also were compared to estimate their efficiency. Results revealed that both modules show identical concentration ratios of 610 when the tracking error is not considered. However, the concentration ratio of the first design rapidly drops when the sun tracking error overshoots even 0.1°, whereas the concentration ratio of the second design remained constant within the range of the 0.8° tracking error. It was concluded that a paraboloidal reflector is not appropriate for the second mirror in a Cassegrain concentrator due to its low acceptance angle. The maximum collection efficiency was achieved when the f-number is smaller and the rim angle is bigger and when the secondary reflector is in a hyperboloid shape. The target area has to be rather bigger with a shorter focal length for the secondary reflector to obtain a wider acceptance angle.

Spherical micro-hole grid for high-resolution retarding field analyzer

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
Takayuki Muro ◽  
Tomohiro Matsushita ◽  
Kazumi Sawamura ◽  
Jun Mizuno
Keyword(s):  
High Resolution ◽  
Energy Resolution ◽  
Cylindrical Hole ◽  
Display Type ◽  
Photoemission Spectrum ◽  
Acceptance Angle ◽  
Wide Acceptance ◽  
Inner Radius ◽  
Micro Hole ◽  
Cylindrical Holes

A wide-acceptance-angle spherical grid composed of numerous micro cylindrical holes was developed to be used for the retarding grid of a display-type retarding field analyzer (RFA) and to enhance the energy resolution (E/ΔE). Each cylindrical hole with a diameter of 50 µm and a depth of 80 µm is directed to the spherical center. The inner radius of the spherical grid is 40 mm. The holed area corresponds to an acceptance angle of ±52°. The E/ΔE of an RFA equipped with the developed holed grid was estimated to be 2000 from a measured Au 4f photoemission spectrum. A clear photoelectron hologram was observed in the Mo 4p core-level region of MoS2, indicating that the RFA with the holed grid is effective for photoelectron holography.

scholarly journals Experimental investigation of solar compound parabolic collector using Al2O3/H2O nanofluid in a subtropical climate

2020 ◽  
pp. 201-201
Author(s):  
Faria Akhtar ◽  
Muzaffar Ali ◽  
Nadeem Sheikh ◽  
Muhammad Shehryar
Keyword(s):  
Base Fluid ◽  
Concentration Ratio ◽  
Heat Transfer Fluid ◽  
Subtropical Climate ◽  
Solar Concentrator ◽  
Acceptance Angle ◽  
Flow Rates ◽  
Climate Conditions ◽  
Medium Range ◽  
Parabolic Collector

Different solar concentrator technologies are used for low-medium range temperature applications. In this paper, a non-tracking compound parabolic collector with a nanofluid is experimentally analyzed under real climate conditions of a typical sub-tropical climate Taxila, Pakistan. The collector used for the experimentation has concentration ratio of 4.17, collector area of 0.828 m2 and half acceptance angle of 24?. The heat transfer fluid used for the study is water based nanofluid with particles of Al2O3. The investigation is carried out at three different volumetric concentrations (0.025%, 0.05%,0.075%) of nanofluids at flowrates of 0.01 kg/s, 0.02 kg/s, 0.05 kg/s and 0.07 kg/s are compared with base fluid (water). Comparison of system thermal efficiency, solar heat gain, and temperature difference is presented for different selected days in real climate conditions during months of March to May. It is observed that performance of the compound parabolic collector is improved by 8%, 11%, 14% and 19%, respectively at considered flow rates compared to water.

scholarly journals Self-tracking solar concentrator with an acceptance angle of 32°

2014 ◽  
Vol 22 (S7) ◽  
pp. A1880 ◽  
Author(s):  
Volker Zagolla ◽  
Didier Dominé ◽  
Eric Tremblay ◽  
Christophe Moser
Keyword(s):  
Solar Concentrator ◽  
Acceptance Angle

scholarly journals Optimal Design of a Secondary Optical Element for a Noncoplanar Two-Reflector Solar Concentrator

2015 ◽  
Vol 2015 ◽  
pp. 1-8
Author(s):  
Yi-Cheng Chen ◽  
Chia-Chi You
Keyword(s):  
Design Process ◽  
Parametric Design ◽  
Optical Element ◽  
Solar Concentrator ◽  
Optical Performance ◽  
Parabolic Mirror ◽  
Acceptance Angle ◽  
Optical Efficiency ◽  
Two Phases ◽  
Ray Tracing Simulation

This paper presents the results of a parametric design process used to achieve an optimal secondary optical element (SOE) in a noncoplanar solar concentrator composed of two reflectors. The noncoplanar solar concentrator comprises a primary parabolic mirror (M1) and a secondary hyperbolic mirror (M2). The optical performance (i.e., acceptance angle, optical efficiency, and irradiance distribution) of concentrators with various SOEs was compared using ray-tracing simulation. The parametric design process for the SOE was divided into two phases, and an optimal SOE was obtained. The sensitivity to assembly errors of the solar concentrator when using the optimal SOE was studied and the findings are discussed.

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