Optical and thermal performance of double receiver compound parabolic concentrator

Bala, Abdullahi; Al-Dadah, Raya; Mahmoud, Saad; Hood, Richard

doi:10.1016/j.apenergy.2015.08.063

Cited by 42 publications

(20 citation statements)

References 24 publications

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“…OptisWorks 2012 is simulation software used to simulate the optical performance of different concentrator solar collectors based on ray-tracing techniques. This tool has been intensively used by some researchers [40][41][42][43][44][45][46][47]. With the new features, especially the three-dimensional detector, the software is capable of seeing exactly what is going on inside the geometry of the cavity receiver and how the reflected flux is distributed on the cavity walls.…”

Section: -Numerical Simulation Of the Modelsmentioning

confidence: 99%

The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

2016

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Section: -Numerical Simulation Of the Modelsmentioning

confidence: 99%

The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

2016

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“…The Monte Carlo ray-tracing method is widely used in the optical analysis of various types of solar concentrator systems, such as the dish concentrator system, 12-14 parabolic trough system, 22 and solar heliostat concentration plant. 23,24 For the Monte Carlo ray-tracing method, first, through the discretization of the reflection mirror of the solar concentrator, solar incident cone and cavity receiver surface, then simulating the reflection of each solar incident ray on the mirror surface of the solar concentrator, and the multiple reflection and absorption processes after the solar ray entering the cavity receiver, finally, count the solar radiation energy received by each element of the receiver surface and obtain the flux distribution on the cavity receiver.…”

Section: Methodology Description and Validationmentioning

confidence: 99%

“…23,24 For the Monte Carlo ray-tracing method, first, through the discretization of the reflection mirror of the solar concentrator, solar incident cone and cavity receiver surface, then simulating the reflection of each solar incident ray on the mirror surface of the solar concentrator, and the multiple reflection and absorption processes after the solar ray entering the cavity receiver, finally, count the solar radiation energy received by each element of the receiver surface and obtain the flux distribution on the cavity receiver. 8,9,22,25 With the increase of the new features in OptisWorks 2012 software, especially the 3-dimensional (3D) detector technologies, the software is capable of seeing exactly what is going on inside the geometry of the cavity receiver and how the reflected flux is distributed on the cavity walls.…”

Section: Methodology Description and Validationmentioning

confidence: 99%

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Effects of geometrical parameters of a dish concentrator on the optical performance of a cavity receiver in a solar dish-Stirling system

2018

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Summary Dish‐Stirling concentrated solar power (DS‐CSP) system is a complex system for solar energy‐thermal‐electric conversion. The dish concentrator and cavity receiver are optical devices for collecting the solar energy in DS‐CSP system; to determine the geometric parameters of dish concentrator is one of the important steps for design and development of DS‐CSP system, because it directly affects the optical performance of the cavity receiver. In this paper, the effects of the geometric parameters of a dish concentrator including aperture radius, focal length, unfilled radius, and fan‐shaped unfilled angle on optical performance (ie, optical efficiency and flux distribution) of a cavity receiver were studied. Furthermore, the influence of the receiver‐window radius of the cavity receiver and solar direct normal irradiance is also investigated. The cavity receiver is a novel structure that is equipped with a reflecting cone at bottom of the cavity to increases the optical efficiency of the cavity receiver. Moreover, a 2‐dimensional ray‐tracking program is developed to simulate the sunlight transmission path in DS‐CSP system, for helping understanding the effects mechanism of above parameters on optical performance of the cavity receiver. The analysis indicates that the optical efficiency of the cavity receiver with and without the reflecting cone is 89.88% and 85.70%, respectively, and former significantly increased 4.18% for 38 kW XEM‐Dish system. The uniformity factor of the flux distribution on the absorber surface decreases with the decreases of the rim angle of the dish concentrator, but the optical efficiency of the cavity receiver increases with the decreases of the rim angle and the increase amplitude becomes smaller and smaller when the rim angle range from 30° to 75°, So the optical efficiency and uniformity factor are conflicting performance index. Moreover, the unfilled radius has small effect on the optical efficiency, while the fan‐shaped unfilled angle and direct normal irradiance both not affect the optical efficiency. In addition, reducing the receiver‐window radius can improve the optical efficiency, but the effect is limited. This work could provide reference for design and optimization of the dish concentrator and establishing the foundation for further research on optical‐to‐thermal energy conversion.

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“…The concentrator is composed of two identical curved reflecting surfaces placed in such a way that both surfaces are oppositely reflecting a focal point [1,5,23,[25][26][27]; in 2004, Chaves provided the appropriate description for the design which uses a cylindrical receiver, contemplating the total illumination of the receiver [26].…”

Section: Concentrator Designmentioning

confidence: 99%

Solar Ray Tracing Analysis to Determine Energy Availability in a CPC Designed for Use as a Residential Water Heater

et al. 2018

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Abstract:Compound parabolic concentrators are relevant systems used in solar thermal technology. With adequate tailoring, they can be used as an efficient and low-cost alternative in residential water heating applications. This work presents a simulation study using a ray tracing analysis. With this technique, we simulate the interaction between solar rays and solar concentrator to quantify the amount of energy that impinges on the receiver at a particular time. Energy availability is evaluated in a comparison of two configurations throughout the year: static setup at 21 • and multi-position setup; tilted with respect to the horizontal, depending on three seasonal positions: 0 • for summer, 16 • for spring/autumn, and 32 • for winter, with the aim to evaluate the amount of available energy in each season. The fact that a tracking system can be dispensed with also represents an economical option for the proposed application. The results showed that at 21 • , the proposed solar Compound Parabolic Concentrator (CPC) works satisfactorily; however, by carrying out the selected angular adjustments, the overall energy availability increased by 22%, resulting in a more efficient option. The most effective design was also built and analyzed outdoors. The obtained thermal efficiency was of~43%. The optical design and its evaluation developed herein proved to be a valuable tool for prototype design and performance evaluation.

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Optical and thermal performance of double receiver compound parabolic concentrator

Cited by 42 publications

References 24 publications

The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

Effects of geometrical parameters of a dish concentrator on the optical performance of a cavity receiver in a solar dish-Stirling system

Solar Ray Tracing Analysis to Determine Energy Availability in a CPC Designed for Use as a Residential Water Heater

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