A critical analysis on the energy and exergy performance of photovoltaic/thermal (PV/T) system: The role of nanofluids stability and synthesizing method

Parsa, Seyed Masoud; Yazdani, Alireza; Aberoumand, Hossein; Farhadi, Yousef; Ansari, Abolfazl; Aberoumand, Sadegh; Karimi, Nader; Afrand, Masoud; Cheraghian, Goshtasp; Ali, Hafız Muhammad

doi:10.1016/j.seta.2021.101887

Cited by 25 publications

(10 citation statements)

References 81 publications

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“…Thus, the selection of nanofluid type in a PVT system is vital to ensure compatibility and meet the desired performance criteria. Table 6 summarizes studies involving PVT systems with nanofluids as coolant media, featuring different types and configurations [54,[137][138][139][140][141][142][143][144][145][146][147].…”

Section: Nanofluidsmentioning

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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Section: Nanofluidsmentioning

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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“…The system performance in the turbulent region is 3 % superior to the laminar regime when utilizing a two-step manufactured nanofluid, which is directly related to the nanofluid's durability. According to the findings, the nanofluid synthesis method and its stability significantly impact the performance of photovoltaic thermal systems (PVTs) [15].…”

Section: Sonicationmentioning

confidence: 99%

Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

2023

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Nanofluids are utilized in cooling equipment such as heat exchangers and renewable energies such as solar cells as heat transfer fluid. The techniques for nanofluid stability enhancement and stability evaluations, such as zeta potential, electron microscopy, and photographic techniques for sedimentation, are reviewed as well as some recent achievements in nanofluid stabilization and research on the parameters affecting the thermal properties of nanofluids. Finally, the applications of nanofluids in cooling devices are described. Increased heat transfer, reduced heat transfer time and size of heat exchangers, and finally higher energy and heat efficiency could be the most significant achievements. The parameters affecting the thermal conductivity of nanofluids include concentration, temperature, particle fluid, type of base fluid, and nanoparticles.

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“…The exergy analysis can provide a more comprehensive and rational assessment of the system. The exergy efficiency of the cyclic pressurization unit can be calculated by 29 :…”

Section: Evaluation Indicatorsmentioning

confidence: 99%

“…The exergy analysis can provide a more comprehensive and rational assessment of the system. The exergy efficiency of the cyclic pressurization unit can be calculated by 29 :

η_{normalE} = \frac{e_{cyclic}}{w_{cyclic}}

where

e_{cyclic}

is the exergy of the air obtained in the cyclic pressurization unit. Such exergy can be calculated by:

e_{cyclic} = h_{cyclic}^{out} - h_{cyclic}^{in} - T_{amb} (s_{cyclic}^{out} - s_{cyclic}^{in})

where

h_{cyclic}^{out}

and

h_{cyclic}^{in}

are the specific enthalpy of the air at the outlet and inlet of the cyclic pressurization unit, respectively.…”

Section: Thermodynamic Modelmentioning

confidence: 99%

Thermodynamic investigation of variable‐speed compression unit in near‐isothermal compressed air energy storage

Wang

Sun

et al. 2023

Energy Storage

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Isothermal compression is the state‐of‐the‐art in compressed air energy storage (CAES) technology. The study of cyclic pressurization unit in isothermal CAES is carried out in this paper. The unit can continuously compress air utilizing double vessels operating alternately. In each vessel, the large heat capacity of water and spray cooling is applied to establish a conducive environment for the air achieving the effect of efficient near‐isothermal compression. The operating mode of the cyclic pressurization unit is divided into sliding‐pressure operation and constant‐pressure operation according to the pressure of its outlet. By adopting the characteristic curves of pump, the dynamic model is built for the unit in this paper. Further, the differences between the cyclic pressurization unit in isentropic process and in variable‐speed process are quantified and compared in four different cases. In isentropic process, the energy‐saving ratio and exergy efficiency of the unit are expected to reach 20.4% and 95.0%, respectively. In variable‐speed process, the energy‐saving ratio and efficiency of the unit can achieve 7.3% and 73.4%, respectively. This gap is mainly determined by the off‐design performance of the pump. Moreover, the vessel volume should be no less than 3 m3 and 5 m3 when there is spraying and when there is no spraying. Furthermore, spraying favors the improvement of the worsened compression performance caused by the change of design parameters. The energy‐saving ratio can be improved via spraying by 1.3% to 11.0% and 1.8% to 25.6% in the isentropic and variable‐speed processes, respectively. Meanwhile, the exergy efficiency can be increased by 1.5% to 9.4% in the isentropic process and 1.4% to 8.4% in the variable‐speed by spraying.

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A critical analysis on the energy and exergy performance of photovoltaic/thermal (PV/T) system: The role of nanofluids stability and synthesizing method

Cited by 25 publications

References 81 publications

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

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

Effects of Key Parameters on Nanofluid Thermal Performance in Heat Exchangers

Thermodynamic investigation of variable‐speed compression unit in near‐isothermal compressed air energy storage

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