Thermodynamic and optical analyses of a hybrid solar CPV/T system with high solar concentrating uniformity based on spectral beam splitting technology

Wang, Gang; Yao, Yubo; Chen, Zeshao; Peng, Hu

doi:10.1016/j.energy.2018.10.089

Cited by 205 publications

(41 citation statements)

References 23 publications

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“…According to the optical analysis results of the hybrid receiver, we estimate the receiver performance by calculating the PV conversion efficiency regarding the energy striking the silicon CPV cell, not the total power striking the receiver. According to the spectral distribution of the light reaching on the PV module G ( λ ) pv (Figure ), the following equation is used to achieve the PV conversion efficiency η c :

η_{c} = \frac{{FF}_{CR} * V_{OC, CR} * J_{SC, pv}}{\int_{280}^{4000} G {(λ)}_{pv} normald λ}

where J SC,pv is short circuit current density of the silicon CPV cell with combined filter. The results of PV conversion efficiency regarding the energy reaching on the silicon CPV cell are shown in Figure .…”

Section: Efficiency Analysismentioning

confidence: 99%

Design and analysis of a CPV/T solar receiver with volumetric absorption combined spectral splitter

et al. 2020

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Summary Spectral beam splitting is a promising technology to achieve the maximum electrical and thermal outputs from concentrating photovoltaic/thermal (CPV/T) systems simultaneously. In this article, a novel CPV/T receiver is proposed by incorporating a fluid based filter together with a solid absorptive filter. The geometry of the receiver is developed for a designed linear flat mirror concentrator. According to the optical transmittance of both fluid based filters and solid absorptive filters, as well as their corresponding merit functions, four fluid filters and two solid filters are determined to be the candidates of the combined filter for the silicon concentrator solar cell. Then, a complete solar radiation propagation process from concentrator to the designed CPV/T receiver is simulated using ray tracing software‐LightTools. The results show that the surface illumination uniformity of the PV module filtered by each combined filter under the linear flat mirror concentrator is higher than 96%. Using 5 g/L CoSO4 solution and HB650 as the combined filter, 33.67% of the concentrated light can be directed to the PV module with the remainder collected by the filter as thermal energy and the silicon CPV cells can convert 27.06% of this energy into electrical power. This contributes to the fact that 92.43% of the light striking the PV module is within 650‐1100 nm, which is the spectral response range of the cell can work efficiently. The total efficiency of 49.88% can be achieved with such a filter and the electrical efficiency is 9.1% with respect to the total incident power on the receiver.

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η_{c} = \frac{{FF}_{CR} * V_{OC, CR} * J_{SC, pv}}{\int_{280}^{4000} G {(λ)}_{pv} normald λ}

Section: Efficiency Analysismentioning

confidence: 99%

Design and analysis of a CPV/T solar receiver with volumetric absorption combined spectral splitter

et al. 2020

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“…In the case of solar thermal power generation, steam is generated and then current is produced using the steam turbine, whereas in the case of solar PV power generation, solar radiation is directly converted into the electricity [3][4][5]. Use of solar concentrator is an effective approach in solar PV power generation in order to increase the output power and to reduce the investment cost [6].…”

Section: Introductionmentioning

confidence: 99%

“…The combined system could achieve up to 0.87 optical efficiency [38]. Recently, multi-segment mirror hybrid solar concentration system has been developed using spectral beam splitting technology providing high uniformity of solar radiation flux density distribution on solar cells [6].However, to date, nobody has employed multiple aspheric reflectors to achieve a higher concentration ratio for off-axis point focusing. Aspheric reflectors can remove the aberrations efficiently and it is anticipated that solar spot would decrease the diameter to achieve the high solar concentration ratio.…”

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confidence: 99%

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Solar Concentrator Consisting of Multiple Aspheric Reflectors

Cao¹,

Qin

Rajan

et al. 2019

Energies

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This paper presents an off-axis-focused solar concentrator system consisting of 190 aspheric reflectors, where the aperture radius of each reflector is 10 cm, and vertices of all reflectors are orderly arranged in the same plane. The aspheric parameters controlling the curvature of the reflectors are determined using coordinate transformations and the particle swarm optimization (PSO) algorithm. Based on these aspheric parameters, the light distribution of focal plane was calculated by the ray tracing method. The analyses show that the designed concentrator system has a spot radius of less than 1 cm and the concentration ratio over 3300:1 is achieved using only one reflection. The design results have been verified with the optical design software Zemax.Most of the important developments of solar concentrators have been done in the solar thermal and PV systems. In the solar thermal system, the most common method is to increase focusing stages and reflectors. Rodriguez-Sanchez et al. (2015) employed secondary devices to optimize the focusing position and the incidence angle of sunlight [17]. Balaji et al. (2016) employed the combination of multi-stage focusing and multiple reflectors to increase the concentration ratio and also to improve the flux distribution over the circumference of the absorber [18]. Benyakhlef et al. (2016) used multiple rotating curved heliostats instead of flat ones to reflect the sun-rays onto the linear receiver at a fixed position. Primary focusing heliostats were arranged in rows whereas the secondary reflector was only one reflector. Interestingly, the curvature allowed the heliostats to be more precise than in flat ones and offered a higher concentration capacity [19]. Sharma et al. (2015) utilized the line Fresnel reflector (LFR) field consisting of parallel rows of collectors in which each collector-row was composed of parallel rows of reflectors that direct the sun-rays toward linear receivers [20]. Qin et al. (2013) raised the concentration ratio of a trough concentrator to 285:1 in case of off-axis focus by adopting reflective aspheric surfaces [14]. Recently, a prototype of two-stage non-imaging solar concentrator showed a higher concentration ratio at the receiver plane [21]. However, improving the spatial uniformity can efficiently increase the concentration ratio. A new concept of high-flux non-coaxial concentrating solar simulator was introduced to the typical ellipsoidal reflectors [22]. In some cases, multiple reflectors were used to focus the solar beam on the same small area in order to increase the temperature of the focus area [23][24][25][26]. Loni et al. (2016) used parabolic dish concentrators to focus the sun-rays on the receiver for obtaining a high temperature of work fluid. Furthermore, they designed a cylindrical closed-tube open-cavity solar receiver in such a way to absorb the solar energy to the maximum extent [27]. Other methods have also been applied to achieve high concentration ratio. Liang et al. (2015) investigated solar concentrator based on the off-ax...

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“…Nevertheless, due to no strict limitations of length of the absorbing body, the aplanat geometry concentrators [10] seem to be comparably more beneficial. Apart from classical geometry studies, vital focus has been recently given to rapidly developing two-stage solar concentrators [4] and spectrum-splitting units [11,12], which might introduce significant benefits to the solar thermal power devices in the future. Alternatively, optimization of the renowned solutions [6,7,13] might introduce the vital benefits for state-of-the-art technology and bridge the gap between current marketavailability and laboratory-scale research.…”

Section: Introductionmentioning

confidence: 99%

Modeling of influence of vibration on intensification of heat transfer within the absorber of the vacuum solar collector

et al. 2019

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Due to escalating role of mitigation of climate change in power and energy sector, power units based on renewable energy sources (RES) became vital part of global power and heat market, including distributed heat generation as well. Significant number of such installations belong to individual users, commonly using solar collectors to prepare domestic hot water directly at their sites. However, the vitally variable solar irradiance makes the solar energy difficult in efficient harvesting considering long time period. Thus, maximization of power gain from single solar absorber, when the solar radiation flux is temporarily high, might lead to further rise in overall, year-averaged efficiency of such units. The paper concerns modelling of intensification of heat transfer, taking place within the absorber of a vacuum solar collector, due to insertion of vibrating element inside the thermal oil canal, compared to static turbulization method. Different geometries of vibrating elements and amplitudes of oscillatory motion, as well as heat carriers, are investigated using commercially available CFD software. Results indicate rise in solar power acquired within the absorber using vibrating elements, with essential difference between circulating media, and suggest vital benefits from utilization of static turbulizing devices.

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Thermodynamic and optical analyses of a hybrid solar CPV/T system with high solar concentrating uniformity based on spectral beam splitting technology

Cited by 205 publications

References 23 publications

Design and analysis of a CPV/T solar receiver with volumetric absorption combined spectral splitter

Design and analysis of a CPV/T solar receiver with volumetric absorption combined spectral splitter

Solar Concentrator Consisting of Multiple Aspheric Reflectors

Modeling of influence of vibration on intensification of heat transfer within the absorber of the vacuum solar collector

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