Numerical Simulation for Focal Region Characterization in a New Solar Concentrator

2014 ◽  
Vol 13 (05n06) ◽  
pp. 1460006
Author(s):  
Leilei Wang
Keyword(s):  
Energy Distribution ◽  
Focal Plane ◽  
Focal Spot ◽  
Specular Reflection ◽  
Position Error ◽  
Focal Region ◽  
Solar Concentrator ◽  
Absolute Value ◽  
Pointing Error ◽  
New Type

Considering the sun light nonparallelism, Monte Carlo ray tracing method and specular reflection law are employed to simulate the effects of focal plane position error, pointing error to spot shape and energy distribution on focal plane of a new type of space solar concentrator. The results show that: with the absolute value of focal plane position error increasing, focal spot radius increases and peak energy flux value on focal plane decreases; when absolute value of focal plane position error is same, focal spot shape and energy distribution is almost the same; with pointing error increasing, the deviation of focal spot from the focal plane center increases and round focal spot becomes oval focal spot gradually. This will provide a reference for the new space solar concentrating and absorbing system design.

Performance Improvement Study of Linear Photovoltaic Systems With Concentration of Solar Radiation

2020 ◽  
pp. 164-190
Author(s):  
Petr Alexandrovich Nesterenkov ◽  
Alexander Gennadievich Nesterenkov
Keyword(s):  
Solar Cells ◽  
Solar Radiation ◽  
Production Costs ◽  
Cost Calculation ◽  
Focal Region ◽  
Efficiency Increase ◽  
New Type ◽  
Temperature Liquid ◽  
Engineering Characteristic ◽  
Optical Concentrator

A new type of linear cooled photodetectors is considered, of which in the focal region of the optical concentrator mirrors is installed an array of solar cells operating with the low-ratio solar concentration. This work is focused on the theoretical and experimental substantiation of the efficiency increase of photodetectors under conditions of an optimal combination between solar radiation concentration and heat transfer intensity of photovoltaic cells with heat carriers. The problem of obtaining a high temperature liquid due to the limitations of solar cells is solved by organizing the flow of fluid within the thermal collector channels in the focal region of an additional optical concentrator. A mathematical model of engineering characteristic calculation of the Ʌ - shaped photodetectors and cost calculation of electrical and thermal energy generation is presented. The research results are used in the development of industrial prototypes of photodetectors with a concentration of solar radiation and low production costs.

scholarly journals Tight focusing of light beams: a set of exact solutions

2016 ◽  
Vol 472 (2195) ◽  
pp. 20160538 ◽  
Author(s):  
John Lekner
Keyword(s):  
Exact Solutions ◽  
Focal Plane ◽  
Bessel Functions ◽  
Momentum Conservation ◽  
Focal Region ◽  
Beam Direction ◽  
Lommel Functions ◽  
Tight Focusing ◽  
Causal Propagation ◽  
Light Beams

Exact solutions of Maxwell's equations representing light beams are explored. The solutions satisfy all of the physical requirements of causal propagation and of energy, momentum and angular momentum conservation. A set of solutions can be found from a proto-beam by an imaginary translation along the beam direction. The proto-beam is given analytically in terms of the Bessel functions J 0 , J 1 and the Lommel functions U 0 , U 1 , or equivalently in terms of products of the spherical Bessel functions and Legendre polynomials. The complex wavefunction has rings of zeros in the focal plane. Localization of the focal region is to within about one half of the vacuum wavelength.

Investigation on Temperature Field and Thermal Stress of Dish Solar Concentrator’s Focal Region

2011 ◽  
Vol 148-149 ◽  
pp. 20-23
Author(s):  
Xing Zhi Wang ◽  
Yong Shuai ◽  
Fu Qiang Wang ◽  
Chun Liang Yu
Keyword(s):  
Temperature Field ◽  
Thermal Stress ◽  
Stress Field ◽  
Infrared Camera ◽  
Radiant Heat ◽  
Focal Region ◽  
Solar Concentrator ◽  
Flux Function ◽  
Thermal Stress Field ◽  
Good Accordance

Depending on the solar radiant flux and velocity measured in Harbin, with finite element method, use a modified radiant heat flux function to calculate the temperature field of a plate on the focal region of a dish solar concentrator. Compared the result with picture taken by infrared camera, there is a good accordance between them. The temperature field is used as the loading parameters to calculate the thickness’s impact on the thermal stress field in the plate. When the value of the thickness increases, the maximum values of the stress increase, but the overall stress field tend to decrease.

scholarly journals The dispersion of a light pulse by a prism

1914 ◽  
Vol 90 (618) ◽  
pp. 298-312
Keyword(s):  
Energy Distribution ◽  
General Expression ◽  
Light Pulse ◽  
Focal Plane ◽  
Definite Function ◽  
Initial Pulse ◽  
Initial Form ◽  
First Time

This investigation is a continuation of a former one in which an expression was derived for a light pulse with an energy distribution given by Wien's law. The first three paragraphs are supplementary to the former paper; the rest of the investigation deals with the passage of the same pulse through a prism and its separation into the different colours in the focal plane of a telescope. The general principles according to which this must take place are, of course, known, but here the actual disturbance at every point in the focal plane is given for the first time as a definite function of the time and as a result it is possible to state how many waves there are in the trains, which the single initial pulse gives rise to in the various parts of the spectrum. §1. My general expression for the initial form of a light pulse was cos ( n + ½) θ /( x 2 + h 2 ) (2 n +1)/4 , where tan θ = x/h . I did no notice until after the former paper was communicated, that this expression is 1/Г ( n + ½) ∫ ∞ 0 e - ha cos αx α n -½ dα .

Energy distribution on the focal plane of a parabolic cylindrical concentrator with angular defocusings

2007 ◽  
Vol 43 (1) ◽  
pp. 30-33
Author(s):  
A. V. Vardanyan ◽  
K. A. Pogosyan ◽  
G. S. Aloyan ◽  
Z. S. Ovsepyan
Keyword(s):  
Energy Distribution ◽  
Focal Plane

scholarly journals On the measurement of low magnetic susceptibility by an instrument of new type

1921 ◽  
Vol 98 (692) ◽  
pp. 274-284 ◽  
Keyword(s):  
Magnetic Force ◽  
Mechanical Force ◽  
The Other ◽  
Static System ◽  
Absolute Value ◽  
Wide Range ◽  
New Type ◽  
Electro Magnetic ◽  
A Charge ◽  
Magnetic Case

It is well known in instruments of the Curie type that when the magnetising force impressed upon the substance is varied and the mechanical force is balanced against that of the torsion in a suspending fibre, the deflec­tions follow the square law and the range through which the magnetic force can be varied is restricted. In fact, it is difficult with the Curie balance to measure the susceptibility of a given specimen outside a narrow range of magnetic force of about one to five. One object in the design of the present instrument was to be able to measure susceptibility with a given specimen through a wide range of magnetic force. Another object was to make the instrument portable in the sense that no spot of light and scale are required, and yet be able to measure susceptibility through a wide range. In all the tests so far made the instrument was placed on an ordinary table. The fundamental idea is to replace the force due to torsion in a suspending fibre by either an electro-magnetic or electro-static system in which the mechanical force is due to two components—one proportional to the magnetic force impressed upon the specimen, and the other also proportional to the magnetic force in the case of constant susceptibility, but variable if the susceptibility varies. In the electro-magnetic case a moving coil can be employed, which is suspended in a magnetic field proportional in strength to the magnetic force acting upon the specimen. This is the method adopted in the present paper. It has the advantage that the absolute value of the susceptibility can be calculated from the known details of the instrument, and a considerable mechanical force can be produced. In the electro-static method we are concerned with the product of two voltages—one propor­tional to the magnetic force acting upon the specimen, and the other also proportional to this force if the susceptibility is constant, but other­wise varying with the susceptibility. This method has the advantage that the suspending fibre has only to carry a charge to the moving system, and not a definite current as in the electro-magnetic system. Also there is no question as to magnetic disturbance due to stray fields.

Performance and Evaluation of Concentrating Solar Collectors for Power Generation

1965 ◽  
Vol 87 (1) ◽  
pp. 1-7 ◽  
Author(s):  
B. Y. H. Liu ◽  
R. C. Jordan
Keyword(s):  
Power Generation ◽  
Focal Plane ◽  
Flux Distribution ◽  
Solar Concentrator ◽  
Solar Collectors ◽  
Optimum Size ◽  
Target Error ◽  
Performance And Evaluation ◽  
Normal Law ◽  
General Method

The geometrical accuracy of a real solar concentrator is defined quantitatively in terms of two equivalent parameters: the standard target error and the angular error; and the relationships between these parameters and the flux distribution on the focal plane are developed. A general method for determining the optimum size and efficiency of an absorber for any given concentrator is described. Specific numerical results are obtained; however, only for the case where the function describing the flux distribution on the focal plane is given by Gauss’ normal law of error. Criteria for determining the applicability of the results are proposed. Finally, experimental techniques (both optical and thermal) of evaluating concentrators are briefly described.

scholarly journals Analyzing the Symmetry Properties of a Distribution in the Focal Plane for a Focusing Element with Periodic Angle Dependence of Phase

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Svetlana N. Khonina ◽  
Andrey V. Ustinov
Keyword(s):  
Focal Plane ◽  
Simple Technique ◽  
Focal Spot ◽  
Spot Size ◽  
Diffractive Optical Elements ◽  
Focal Spot Size ◽  
Optical Elements ◽  
Symmetry Properties ◽  
Tight Focusing ◽  
Plane Distribution

We analyze the symmetry properties of the focal plane distribution when light is focused with an element characterized by a periodic angular dependent phase, sin (mφ) or cos (mφ). The majority of wave aberrations can be described using the said phase function. The focal distribution is analytically shown to be a real function at odd values of m, which provides a simple technique for generating designed wave aberrations by means of binary diffractive optical elements. Such a possibility may prove useful in tight focusing, as the presence of definite wave aberrations allows the focal spot size to be decreased. The analytical computations are illustrated by the numerical simulation, which shows that by varying the radial parameters the focal spot configuration can be varied, whereas the central part symmetry is mainly determined by the parity of m: for even the symmetry order is 2m and for odd is m.

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