Development of highly efficient, glazed PVT collectors with overheating protection to increase reliability and enhance energy yields

Lämmle, Manuel; Hermann, Michael; Krämer, Korbinian; Panzer, Clemens; Piekarczyk, Andreas; Thoma, Christoph; Fahr, Sven

doi:10.1016/j.solener.2018.09.082

Cited by 18 publications

(4 citation statements)

References 27 publications

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“…13 , the difference in the riser configuration shows a temperature change trend but does not differ specifically. The lowest maximum PV temperature when water is used is 300.50 K. The fluid greatly influences the heat transfer process in PV solar cells [ 84 ]. In comparison, the shape of the riser collector configuration does not significantly affect the heat transfer process.…”

Section: Resultsmentioning

confidence: 99%

The use of a hybrid photovoltaic/thermal (PV/T) collector system as a sustainable energy-harvest instrument in urban technology

Prasetyo¹,

Prabowo²,

Arifin³

2023

Heliyon

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Section: Resultsmentioning

confidence: 99%

The use of a hybrid photovoltaic/thermal (PV/T) collector system as a sustainable energy-harvest instrument in urban technology

Prasetyo¹,

Prabowo²,

Arifin³

2023

Heliyon

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“…Although regular dust cleaning is essential maintenance, it does not entirely prevent performance degradation due to shading [21]. The use of materials such as EVA in photovoltaics can lead to performance and lifespan degradation when temperatures rise to 85 • C [22,23]. Additional ambient conditions impacting PV performance are discussed in detail in a previously published article [24].…”

Section: Introductionmentioning

confidence: 99%

A Review of Heat Dissipation and Absorption Technologies for Enhancing Performance in Photovoltaic–Thermal Systems

Kurniawati,

Sung

2024

Energies

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With the growing demand for photovoltaic (PV) systems as a source of energy generation that produces no greenhouse gas emissions, effective strategies are needed to address the inherent inefficiencies of PV systems. These systems typically absorb only approximately 15% of solar energy and experience performance degradation due to temperature increases during operation. To address these issues, PV–thermal (PVT) technology, which combines PV with a thermal absorber to dissipate excess heat and convert it into additional thermal energy, is being rapidly developed. This review presents an overview of various PVT technologies designed to prevent overheating in operational systems and to enhance heat transfer from the solar cells to the absorber. The methods explored include innovative absorber designs that focus on increasing the heat transfer contact surface, using mini/microchannels for improved heat transfer contiguity, and substituting traditional metal materials with polymers to reduce construction costs while utilizing polymer flexibility. The review also discusses incorporating phase change materials for latent heat absorption and using nanofluids as coolant mediums, which offer higher thermal conductivity than pure water. This review highlights significant observations and challenges associated with absorber design, mini/microchannels, polymer materials, phase change materials, and nanofluids in terms of PV waste heat dissipation. It includes a summary of relevant numerical and experimental studies to facilitate comparisons of each development approach.

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“…Regarding the flat plate hybrid solar collectors, Jonas et al [27] simulated the performance of both a covered and uncovered collector and validated the results by experimental data. Lämmle et al [28] built two novel PV/T collectors with overheating protection and tested the effect of this protection on the temperature of the absorber and the efficiency of the system. Lämmle et al [29] studied the effect of low-emissivity coatings on heat losses and electrical production, by numerical models and experimental studies and compared the results with a collector with the same design but without the coating.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Optical Analyses of a Hybrid Solar Photovoltaic/Thermal (PV/T) Collector with Asymmetric Reflector: Numerical Modeling and Validation with Experimental Results

et al. 2023

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This study presents a combined thermal and optical, three-dimensional analysis of an asymmetric compound parabolic collector (ACPC) with an integrated hybrid photovoltaic/thermal (PV/T) receiver with the aim of establishing a sustainable approach in two ways: firstly, by determining the optimal tilt angle for operations, and secondly, by introducing an innovative simulation method which reduces computational cost while calculating thermal performance. Initially the Incident Angle Modifier ( ) was calculated for a wide range of incident angles, and the ray-tracing results were verified using three different simulation tools (Tonatiuh, COMSOL, and SolidWorks) with mean deviations being lower than 4%. The optimal tilt angle of the collector was determined for seven months of the year by conducting a detailed ray-tracing analysis for the mean day of each month considering whole day operation. In the thermal analysis part, the authors introduced novel numerical modeling for numerical simulations. This modeling method, designed with sustainability in mind, enables lighter computational domains for the air gap while achieving accurate numerical results. The approach was established using two distinct simulation tools: COMSOL and SolidWorks. From the optical analysis, it was found that in all months examined there is a four-hour time range around solar noon in which the optimum tilt angle remains constant at a value of 30°. The numerical models constructed for the thermal analysis were verified with each other (6.15% mean deviation) and validated through experimental results taken from the literature regarding the examined collector (<6% mean deviation). In addition, the two simulation tools exhibited a deviation of around 6% between each other. Finally, the thermal performance of the collector was investigated for the mean day of September at solar noon by adopting the optimal tilt angle for that month according to the optical analysis, considering inlet temperatures from 20 °C up to 80 °C.

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Development of highly efficient, glazed PVT collectors with overheating protection to increase reliability and enhance energy yields

Cited by 18 publications

References 27 publications

The use of a hybrid photovoltaic/thermal (PV/T) collector system as a sustainable energy-harvest instrument in urban technology

The use of a hybrid photovoltaic/thermal (PV/T) collector system as a sustainable energy-harvest instrument in urban technology

A Review of Heat Dissipation and Absorption Technologies for Enhancing Performance in Photovoltaic–Thermal Systems

Thermal and Optical Analyses of a Hybrid Solar Photovoltaic/Thermal (PV/T) Collector with Asymmetric Reflector: Numerical Modeling and Validation with Experimental Results

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