An experimental study of a hybrid photovoltaic thermal system based on ethanol phase change self-circulation technology: Energy and exergy analysis

Gao, Yuanzhi; Hu, Guohao; Zhang, Yuzhuo; Zhang, Xiaosong

doi:10.1016/j.energy.2021.121663

Cited by 22 publications

(3 citation statements)

References 34 publications

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“…In an experimental approach (Gao et al, 2022), a phase change cooling technique was combined with porous media in a photovoltaic-thermal (PV-T) collector. The results showed that this combination led to a significant enhancement in the average electrical efficiency of the PV panel.…”

Section: Active Pcm Coolingmentioning

confidence: 99%

Design and Development of Cooling Systems for PV Cells Performance Improvement

Enasel,

Lupu,

Dumitrascu

2023

Bulletin of the Polytechnic Institute of Iași. Machine Constructions Section

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This paper presents a concise review of cooling techniques for the solar PV systems. The photovoltaic effect was firstly experimentally demonstrated by the French physicist Edmond Becquel in 1839. The first useful solar cell (6% energy efficiency) was performed by the Bell Laboratories (1950). They realized that the semiconducting materials such silicon were more efficient than selenium. The following conditions have a significant impact on solar panel’s efficiency, in real-world use: irradiance (W/m2), shading, orientation and temperature. The ambient temperature, wind speed, time of day and the amount of solar irradiance (W/m2) make real variation in cells temperature that often rises above 25ºC. The optimum internal cell temperature is typically 25-30ºC above the ambient air temperature and solar cell performance decreases with increasing temperature with 8-15% in total power output. That’s why engineers design cooling systems to improve the efficiency of solar panels that operate in non-optimal conditions.

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Section: Active Pcm Coolingmentioning

confidence: 99%

Design and Development of Cooling Systems for PV Cells Performance Improvement

Enasel,

Lupu,

Dumitrascu

2023

Bulletin of the Polytechnic Institute of Iași. Machine Constructions Section

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“…However, higher heat capacity and latent heat of fusion were more appropriate for the PCM. In another work [69], exergy analysis was performed on a PV/T system on the basis of ethanol phase change self-circulation technology by considering both glazed and unglazed systems. They observed that the entropy generation of a glazed system was lower than the unglazed one which was interpreted by loss of heat transfer and fluid friction.…”

Section: Exergy Analysis Of Pv/t Systemsmentioning

confidence: 99%

PV/Thermal as Promising Technologies in Buildings: A Comprehensive Review on Exergy Analysis

et al. 2022

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Solar Photovoltaic (PV) systems are degraded in terms of efficiency by increment in their temperature. To keep away from efficiency degradation regarding the temperature increase, various thermal management techniques have been introduced to keep the temperature low. Besides improvement in electrical efficiency, the overall efficiency can be enhanced by using the extracted thermal energy from the cell. The extracted heat in these systems, known as PV/Thermal (PV/T), can be applied for some purposes including water or air heating. This article reviews the works on the PV/T systems exergy analysis and discusses their findings. Based on the findings of the reviewed works, different factors such as the system configuration, used components and elements, and working conditions affect the exergy efficiency of these systems. As an example, use of coolants with improved thermal features, i.e., nanofluids, can cause improvement in the exergy efficiency. In addition to the nanofluid, making use of the thermal energy storage unit can further enhance the exergy efficiency. Furthermore, it has been observed that the materials of nanostructures can be another element that influences the enhancement of exergy efficiency. Moreover, the usage of some components such as glazing can lead to avoidance of thermal energy loss that would be beneficial from an exergy point of view. Finally, according to the reviewed works and knowledge of the authors, some suggestions are represented for future works in this field.

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“…Thermal energy storage is greatly used in people's lives, and phase change materials are popular in recent years, employed in many commercial applications where stable temperatures are required [5,6]. The potential market of phase change materials includes building heating/cooling [7], heatsink [8], clothing [9], etc. Among large-scale electricity storage, pumped hydro energy storage is the most developed technology with a high efficiency of 65-80%.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Dynamic Cold Storage Packed Bed on Liquid Air Energy Storage in an Experiment Scale

Bian

Wang

Wang³

et al. 2021

Energies

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Liquid air energy storage (LAES) is one of the most promising large-scale energy storage technologies for the decarburization of networks. When electricity is needed, the liquid air is utilized to generate electricity through expansion, while the cold energy from liquid air evaporation is stored and recovered in the air liquefaction process. The packed bed filled with rocks/pebbles for cold storage is more suitable for real-world application in the near future compared to the fluids for cold storage. A standalone LAES system with packed bed energy storage is proposed in our previous work. However, the utilization of pressurized air for heat transfer fluid in the cold storage packed bed (CSPB) is confusing, and the effect of the CSPB on the system level should be further discussed. To address these issues, the dynamic performance of the CSPB is analyzed with the physical properties of the selected cold storage materials characterized. The system simulation is conducted in an experiment scale with and without considering the exergy loss of the CSPB for comparison. The simulation results show that the proposed LAES system has an ideal round trip efficiency (RTE) of 39.38–52.91%. With the consideration of exergy destruction of the CSPB, the RTE decreases by 19.91%. Furthermore, increasing the cold storage pressure reasonably is beneficial to the exergy efficiency of the CSPB, whether it is non-supercritical (0.1 MPa–3 MPa) or supercritical (4 MPa–9 MPa) air. These findings will give guidance and prediction to the experiments of the LAES and finally promote the development of the industrial application.

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An experimental study of a hybrid photovoltaic thermal system based on ethanol phase change self-circulation technology: Energy and exergy analysis

Cited by 22 publications

References 34 publications

Design and Development of Cooling Systems for PV Cells Performance Improvement

Design and Development of Cooling Systems for PV Cells Performance Improvement

PV/Thermal as Promising Technologies in Buildings: A Comprehensive Review on Exergy Analysis

The Effect of Dynamic Cold Storage Packed Bed on Liquid Air Energy Storage in an Experiment Scale

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