Electrical characterization of photovoltaic cell with low-concentration ratio square aperture concentrator

Algareu, Abdulmaged; Mahmoud, Saad; Al-Dadah, Raya

doi:10.1002/er.3802

Cited by 5 publications

(5 citation statements)

References 33 publications

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“…For the application of the optimized SDCR system, it can be applied not only to solar concentrating heat utilization or thermal power generation system but also to concentrating photovoltaic with more stringent flux uniformity . In solar concentrating photovoltaic system, the concentrator is required to uniformly focus the solar radiation energy onto the solar cell surface, and an auxiliary cooling system is used to reduce the operating temperature of the solar cell in order to improve the power generation efficiency . Moreover, the heat energy carried by the working medium in the cooling system can also be used in other aspects in order to improve the utilization efficiency of solar energy, such as the seawater desalination and hot water supply .…”

Section: Examples and Discussionmentioning

confidence: 99%

“…In solar concentrating photovoltaic system, the concentrator is required to uniformly focus the solar radiation energy onto the solar cell surface, and an auxiliary cooling system is used to reduce the operating temperature of the solar cell in order to improve the power generation efficiency . Moreover, the heat energy carried by the working medium in the cooling system can also be used in other aspects in order to improve the utilization efficiency of solar energy, such as the seawater desalination and hot water supply . Because the traditional solar concentrated photovoltaic/thermal system uses an open plane solar cell receiver, so the heat loss is very large resulting in its thermal efficiency is very low.…”

Section: Examples and Discussionmentioning

confidence: 99%

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Mirror rearrangement optimization for uniform flux distribution on the cavity receiver of solar parabolic dish concentrator system

2018

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Summary The nonuniform and high‐gradient solar radiation flux on the absorber surface of solar dish concentrator/cavity receiver (SDCR) system will affect its operational reliability and service lifetime. Therefore, homogenization of the flux distribution is critical and important. In this paper, 2 mirror rearrangement strategies and its optimization method by combining a novel ray tracing method and the genetic algorithm are proposed to optimize the parabolic dish concentrator (PDC) so as to realize the uniform flux distribution on the absorber surface inside the cavity receiver of SDCR system. The mirror rearrangement strategy includes a mirror rotation strategy and mirror translation strategy, which rotate and translate (along the focal axis) each mirror unit of the PDC to achieve multipoint aiming, respectively. Firstly, a correlation model between the focus spot radius and mirror rearrangement parameters is derived as constraint model to optimize the PDC. Secondly, a novel method named motion accumulation ray‐tracing method is proposed to reduce the optical simulation time. The optical model by motion accumulation ray‐tracing method and optimization model of SDCR system are established in detailed, and then, an optimization program by combining a ray‐tracing code and genetic algorithm code in C++ is developed and verified. Finally, 3 typical cavity receivers, namely, cylindrical, conical, and spherical, are taken as examples to fully verify the effectiveness of these proposed methods. The results show that the optimized PDC by mirror rearrangement strategies can not only greatly improve the flux uniformity (ie, reduce the nonuniformity factor) and reduce the peak local concentration ratio of the absorber surface but also obtain excellent optical efficiency and direct useful energy ratio. A better optimization results when the PDC is optimized by mirror rotation strategy at aperture radius of 7.0 m, focal length of 6.00 m, and ring number of 6; the nonuniform factor of the cylindrical, conical, and spherical cavity receivers is greatly reduced from 0.63, 0.67, and 0.45 to 0.18, 0.17, and 0.26, respectively; the peak local concentration ratio is reduced from 1140.00, 1399.00, and 633.30 to 709.10, 794.00, and 505.90, respectively; and the optical efficiency of SDCR system is as high as 92.01%, 92.13%, and 92.71%, respectively. These results also show that the dish concentrator with same focal length can match different cavity receivers by mirror rearrangement and it can obtain excellent flux uniformity.

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Section: Examples and Discussionmentioning

confidence: 99%

Section: Examples and Discussionmentioning

confidence: 99%

Mirror rearrangement optimization for uniform flux distribution on the cavity receiver of solar parabolic dish concentrator system

2018

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“…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%

“…The OptisWorks 2012 software has been widely used in the fields of the solar optical application. 8,9,22,25…”

Section: Methodology Description and Validationmentioning

confidence: 99%

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 conversion efficiency of the cell in terms of reference efficiency is given by

η_{CPV} = η_{Tref} ([], 1 - ϕ_{ref} ((), T_{PV} - T_{ref})),

where η Tref and ϕ ref are the conversion efficiency and the temperature coefficient of the PV at standard test condition (STC), respectively. To determine the performance and losses of PV system in Equation , the temperature distribution across the layer is expressed as energy balance in the form of conductive heat transfer.…”

Section: Hybrid Pv‐tegmentioning

confidence: 99%

A review on the performance of photovoltaic/thermoelectric hybrid generators

et al. 2020

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Summary Utilization of a broad range of solar spectrum has the potential for high power output from solar cells. However, solar photovoltaics (PVs) can convert only part of the solar electromagnetic spectrum into electricity efficiently. The remaining of the solar radiation is often dissipated in the form of heat, which causes performance reduction and reduces the life expectancy of the solar PV cell. Thermoelectric generators (TEGs) are devices that operate like a heat engine by converting thermal energy into electricity through thermoelectric effect. Integrating a TEG into a PV converter will enhance its efficiency and reduce the amount of heat dissipated. Different studies have been carried out and are still taking place to increase the total efficiency of a coupled photovoltaic thermoelectric generator (PV‐TEG) system. This review discusses the concept of PV converters and thermoelectric devices and presents the various models and numerical and experimental investigations on performance enhancement of integrated PV‐TEGs. The influence of key parameters on the performance of PV‐TEG were also discussed. The review is expected to serve as a reference to recent work on research and development of integrated PV‐TEG systems.

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Electrical characterization of photovoltaic cell with low-concentration ratio square aperture concentrator

Cited by 5 publications

References 33 publications

Mirror rearrangement optimization for uniform flux distribution on the cavity receiver of solar parabolic dish concentrator system

Mirror rearrangement optimization for uniform flux distribution on the cavity receiver of solar parabolic dish concentrator system

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

A review on the performance of photovoltaic/thermoelectric hybrid generators

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