Assessment of the impact of non-uniform illumination and temperature profiles on a dense array CPV receiver performance

Fernández, Álvaro; Laguna, Gerard; Rosell, Joan; Vilarrubí, Montse; Plana, Manuel; Sisó, Gonzalo; Illa, Josep; Barrau, Jérôme

doi:10.1016/j.solener.2018.07.001

Cited by 18 publications

(9 citation statements)

References 21 publications

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“…View Article Online similar cooling device without the self-adaptive microvalve. This technique was also applied in dense array concentrating photovoltaics (CPV) [251]. As the local heat extraction capacity was tailored to the illumination profiles, the temperature difference across the CPV receiver was much reduced and its efficiency was improved.…”

Section: Lab On a Chip Accepted Manuscriptmentioning

confidence: 99%

Nonlinear microfluidics: device physics, functions, and applications

Xia

Zheng

et al. 2021

Lab Chip

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Section: Lab On a Chip Accepted Manuscriptmentioning

confidence: 99%

Nonlinear microfluidics: device physics, functions, and applications

Xia

Zheng

et al. 2021

Lab Chip

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“…In a previous work [35], the performance of a dense CPV array cooled by a matrix of microfluidic cells with individual variable flow rates was assessed for three different electrical configurations, polarized with diodes: series, parallel and matrix configurations (parallel-series). That work also compares at each electrical configuration the electrical performance when it was cooled by microchannels or microfluidic cells with tailored flow.…”

Section: Introductionmentioning

confidence: 99%

“…A comparative analysis is conducted between a module configuration (parallel-series) and a series configuration, both integrated with the DC-DC power converter. Additionally, a 48-cell series configuration, as explored in [35], serves as a reference. The system is assumed to be cooled using a self-adaptive microfluidic cell heat sink to enhance thermal efficiency, with a bypass diode added to each cell to prevent potential cell damage.…”

Section: Introductionmentioning

confidence: 99%

Impact of DC-DC Converters on the Energy Performance of a Dense Concentrator PV Array under Nonuniform Irradiance and Temperature Profiles

Fernández,

Rosell-Mirmi,

Regany

et al. 2024

Energies

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Efficiency losses resulting from electrical mismatching in densely packed photovoltaic arrays present a significant challenge, particularly exacerbated in nonuniformly illuminated receivers and under varying temperatures. Serial configurations are particularly susceptible to radiation nonuniformities, while parallel systems are negatively affected by temperature variations. Various authors have recommended the incorporation of electrical voltage and current sources to mitigate these losses. This study explores different electrical connection configurations utilizing concentrated photovoltaic (CPV) cells and DC-DC electrical current converters. A self-adaptive microfluidic cell matrix cooling system is employed to mitigate thermal dispersion caused by the highly nonuniform illumination profile. The obtained results for each configuration are compared with the total electrical power produced by individual cells, operating under identical radiation and temperature conditions to those of the entire array. The results reveal a noteworthy increase in production across all studied configurations, with the parallel–series arrangement demonstrating the most promising practical utility. This configuration exhibited a remarkable 50.75% increase in power production compared with the standard series connection.

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“…2017) and densely packed photovoltaics (Fernández et al. 2018; Sharaf & Orhan 2018) have generated the need for high heat removal rates in heat exchangers and heat sinks, which could be based on natural convection (Haddad et al. 2017; Baïri 2018 a ; Baïri, Laraqi & Adeyeye 2018) or forced convection (Kewalramani, Agrawal & Saha 2017; Jing et al.…”

Section: Introductionmentioning

confidence: 99%

“…Recent advances stemming from the fields of miniaturized electronics (Dixit & Ghosh 2015;Baïri et al 2017) and densely packed photovoltaics (Fernández et al 2018;Sharaf & Orhan 2018) have generated the need for high heat removal rates in heat exchangers and heat sinks, which could be based on natural convection (Haddad et al 2017;Baïri 2018a;Baïri, Laraqi & Adeyeye 2018) or forced convection (Kewalramani, Agrawal & Saha 2017;Jing et al 2018;Li et al 2018) heat transfer. Convective cooling techniques are designed such that device temperatures remain below material and reliability limits (Liang & Mudawar 2019).…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of nanofluid particle migration and convective heat transfer in microchannels using an Eulerian–Lagrangian approach

et al. 2019

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An Eulerian–Lagrangian modelling approach was employed in order to investigate the flow field, heat transfer and particle distribution in nanofluid flow in a parallel-plate microchannel, with a focus on relatively low Reynolds numbers ($Re\leqslant 100$). Momentum and thermal interactions between fluid and particle phases were accounted for using a transient two-way coupling algorithm implemented within an in-house code that tracked the simultaneous evolution of the carrier and particulate phases while considering timescale differences between the two phases. The inaccuracy of assuming a homogeneous particle distribution in modelling nanofluid flow in microchannels was established. In particular, shear rate and thermophoresis were found to play a key role in the lateral migration of nanoparticles and in the formation of particle depletion and accumulation regions in the vicinity of the channel walls. At low Reynolds numbers, nanoparticle distribution near the walls was observed to gradually flatten in the streamwise direction. On the other hand, for relatively higher Reynolds numbers, higher particle non-uniformities were observed in the vicinity of the channel walls. Furthermore, it was established that convective heat transfer between channel walls and the bulk fluid can either improve or deteriorate with the addition of nanoparticles, depending on whether the flow exceeded a critical Reynolds number of enhancement. It was also established that Brownian motion and thermophoresis had a major role in nanoparticle deposition on the channel walls. In particular, Brownian motion was the main deposition mechanism for nano-sized particles, whereas due to thermophoresis, nanoparticles were repelled away from channel walls. The result of the competition between the two is that deposition gradually increased along the streamwise direction.

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Assessment of the impact of non-uniform illumination and temperature profiles on a dense array CPV receiver performance

Cited by 18 publications

References 21 publications

Nonlinear microfluidics: device physics, functions, and applications

Nonlinear microfluidics: device physics, functions, and applications

Impact of DC-DC Converters on the Energy Performance of a Dense Concentrator PV Array under Nonuniform Irradiance and Temperature Profiles

Numerical investigation of nanofluid particle migration and convective heat transfer in microchannels using an Eulerian–Lagrangian approach

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