scholarly journals Homogeneous Flux Distribution in High-Flux Solar Furnaces

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 433 ◽  
Author(s):  
José Carlos Garcia Pereira ◽  
José Rodríguez ◽  
Jorge Cruz Fernandes ◽  
Luís Guerra Rosa
Keyword(s):  
Ray Tracing ◽  
Flux Distribution ◽  
Thermal Power ◽  
Solar Furnace ◽  
High Flux ◽  
Radiation Distribution ◽  
Homogenous Distribution ◽  
Modelling Studies ◽  
Simulation Results ◽  
Ray Tracing Simulation

Comparisons between experimental data and ray-tracing simulation results are presented for the high-flux SF60 solar furnace available at the Plataforma Solar de Almeria, Spain, which has an estimated thermal power of 60 kW. Since an important issue in many applications of solar concentrated radiation is to obtain a radiation distribution that is as homogeneous as possible over the central working area, so-called radiation homogenisers were also used but the degree of success achieved is just satisfactory, as the results show. Finally, further modelling studies using ray-tracing simulations aiming to attain a homogenous distribution of flux by means of double reflexion using two paraboloid surfaces are presented.

scholarly journals Mathematical Models for Simulation and Optimization of High-Flux Solar Furnaces

2019 ◽  
Vol 24 (2) ◽  
pp. 65 ◽  
Author(s):  
José Carlos Garcia Pereira ◽  
Jorge Cruz Fernandes ◽  
Luís Guerra Rosa
Keyword(s):  
Ray Tracing ◽  
Random Distribution ◽  
Geographical Location ◽  
Simulation Models ◽  
Solar Furnace ◽  
High Flux ◽  
High Concentration ◽  
Simulation And Optimization ◽  
Spherical Curvature ◽  
Optical Paths

High-flux solar furnaces distributed throughout the world have been designed and constructed individually, i.e., on a one-by-one basis because there are several possible optical configurations that must take into account the geographical location and the maximum power to be attained. In this work, three ray-tracing models were developed to simulate the optical paths travelled by sun rays in solar furnaces of high concentration using as an example, the solar furnace SF60 of the Plataforma Solar de Almería, in Spain. All these simulation models are supported by mathematical constructions, which are also presented. The first model assumes a random distribution of sun rays coming from a concentrator with spherical curvature. The second model assumes that a random distribution of parallel rays coming from the heliostat is reflected by a concentrator with spherical curvature. Finally, the third model considers that the random parallel rays are reflected by a concentrator with a paraboloid curvature. The three models are all important in optical geometry, although the paraboloid model is more adequate to optimize solar furnaces. The models are illustrated by studying the influence of mirror positioning and shutter attenuation. Additionally, ray-tracing simulations confirmed the possibility to attain homogenous distribution of flux by means of double reflexion using two paraboloid surfaces.

A Free and Open Source Monte Carlo Ray Tracing Program for Concentrating Solar Energy Research

2010 ◽  
Author(s):  
Jo¨rg Petrasch
Keyword(s):  
Monte Carlo ◽  
Solar Energy ◽  
Open Source ◽  
Ray Tracing ◽  
Modular Design ◽  
Numerical Models ◽  
Solar Furnace ◽  
High Flux ◽  
Energy Research ◽  
Solar Simulator

A free and open source Monte Carlo ray-tracing program for concentrating solar energy research and development is presented. The program uses non energy partitioning Monte Carlo methods to model radiative exchange between arbitrarily arranged surfaces. Surface models include concentrating geometries, such as spherical, parabolic, and elliptical concentrators as well as compound parabolic concentrators. The program’s modular design allows implementation of additional surface and source models. The program has been thoroughly tested and experimentally validated. It has been used to model several concentrating devices including PSI’s high flux solar furnace and ETH’s high flux solar simulator. Furthermore, it has been used to design PSI’s high flux solar simulator and UFL’s high flux solar simulator. The code is particularly suited to provide radiative boundary conditions for numerical models of high temperature solar receivers and solar thermochemical reactors.

scholarly journals Investigation of Spatial Chirp Induced by Misalignments in a Parallel Grating Pair Pulse Stretcher

2020 ◽  
Vol 10 (5) ◽  
pp. 1584 ◽  
Author(s):  
Zhicheng Zhong ◽  
Wenqi Gong ◽  
Hao Jiang ◽  
Honggang Gu ◽  
Xiuguo Chen ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Simulation Method ◽  
Output Pulse ◽  
Imaging Spectrometer ◽  
Chirped Pulse ◽  
Adjustment Procedure ◽  
Simulation Results ◽  
Spatial Chirp ◽  
Ray Tracing Simulation ◽  
Grating Pair

Spatial chirp induced by the misaligned gratings and mirrors in a parallel grating pair pulse stretcher can significantly affect the performance of the output pulses. Firstly, a detailed analysis about the spatial chirp of the stretched pulses caused by the misalignments has been carried out using the ray tracing simulation method. According to the simulation results, an adjustment procedure has been summarized to accurately calibrate these misalignments. The proposed method has been successfully applied in a home-made chirped pulse stretcher. By measuring the output pulse with an imaging spectrometer, the results show the stretched pulse has a good linear temporal chirp and little spatial chirp, which demonstrates the good adjustment of the stretcher.

VLC-LED Receiver Condenser with Optimized CPC

2014 ◽  
Vol 597 ◽  
pp. 480-483
Author(s):  
Zhao Xia Wu ◽  
You Jin Nie ◽  
Wei Jin ◽  
Zhi Xu Zhang ◽  
Qian Qiao ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Ray Tracing ◽  
Signal Intensity ◽  
Concentration Ratio ◽  
Deviation Angle ◽  
Compound Parabolic Concentrator ◽  
Simulation Results ◽  
Ray Tracing Simulation

In order to enhance the signal intensity of VLC-LED receiver, this paper describes a receiver condenser which is designed based on optimized CPC (compound parabolic concentrator) by using a truncated method, for achieving the aim of boosting receiver’s ability of gathering light and enhancing signal intensity. The Monte Carlo-ray tracing simulation results shows that in the VLC-LED system, the optimized CPC condenser has those advantages, such as higher concentration ratio, larger concentrate light deviation angle.

scholarly journals Investigating Intense Rainfall Influence on Distance Measurement with a Time-of-Flight Camera Sensor Using Optical Ray-Tracing Simulation Technique

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 1056
Author(s):  
Marcus Baumgart ◽  
Norbert Druml ◽  
Markus Dielacher ◽  
Cristina Consani
Keyword(s):  
Ray Tracing ◽  
Time Of Flight ◽  
Autonomous Driving ◽  
Intense Rainfall ◽  
Signal Suppression ◽  
Tof Camera ◽  
Ray Tracing Simulation ◽  
Camera Sensors ◽  
Optical Ray Tracing ◽  
Rain Effect

Robust, fast and reliable examination of the surroundings is essential for further advancements in autonomous driving and robotics. Time-of-Flight (ToF) camera sensors are a key technology to measure surrounding objects and their distances on a pixel basis in real-time. Environmental effects, like rain in front of the sensor, can influence the distance accuracy of the sensor. Here we use an optical ray-tracing based procedure to examine the rain effect on the ToF image. Simulation results are presented for experimental rain droplet distributions, characteristic of intense rainfall at rates of 25 mm/h and 100 mm/h. The ray-tracing based simulation data and results serve as an input for developing and testing rain signal suppression strategies.

Design of a New 45 kWe High-Flux Solar Simulator for High-Temperature Solar Thermal and Thermo-Chemical Research

2010 ◽  
Author(s):  
Katherine R. Krueger ◽  
Jane H. Davidson ◽  
Wojciech Lipin´ski
Keyword(s):  
High Temperature ◽  
Focal Plane ◽  
Flux Distribution ◽  
Solar Thermal ◽  
Optimized Design ◽  
High Flux ◽  
Chemical Research ◽  
Solar Simulator ◽  
Peak Flux ◽  
The Common

In this paper, we present a systematic procedure to design a solar simulator for high-temperature concentrated solar thermal and thermo-chemical research. The 45 kWe simulator consists of seven identical radiation units of common focus, each comprised of a 6.5 kWe xenon arc lamp close-coupled to a precision reflector in the shape of a truncated ellipsoid. The size and shape of each reflector is optimized by a Monte Carlo ray tracing analysis to achieve multiple design objectives, including high transfer efficiency of radiation from the lamps to the common focal plane and desired flux distribution. Based on the numerical results, the final optimized design will deliver 7.5 kW over a 6-cm diameter circular disc located in the focal plane, with a peak flux approaching 3.7 MW/m2.

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