Characterization of PVT systems equipped with nanofluids-based collector from entropy generation

Maadi, Seyed Reza; Kolahan, Arman; Passandideh-Fard, Mohammad; Sardarabadi, Mohammad; Moloudi, Reza

doi:10.1016/j.enconman.2017.08.039

Cited by 94 publications

(21 citation statements)

References 32 publications

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“…The outlet temperature reached the maximum value of (50.021 °C) for the system (two reflec-tors and 1% nanofluid mass fraction), whereas in the case of the conventional PV/T collector (without nanofluid and reflectors), the temperature was 39 °C at 1 p. m. The reason behind the rise in the temperature of the solar cell was the existence of the reflectors. These results accorded with the published literature [6,15,26]. Hybrid AL O nano collector with lower reflector Thermal and electrical efficiencies…”

Section: Temperature Of Outlet Watersupporting

confidence: 92%

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The combined effect of nanofluid and reflective mirrors on the performance of PV/thermal solar collector

Khalil¹,

Mohammed²

2018

Therm sci

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A photovoltaic/thermal solar collector is a system which is capable of producing both electricity and thermal energy. However, this technology still needs more studies. In this paper, a mathematical model was presented to study the performance of a photovoltaic/thermal collector by using the upper and lower reflectors with the presence of glass cover. Water and nanofluids (AL 2 O 3-H 2 O) were used as cooling medium. A computer program was proposed to calculate the amount of solar radiation reflected on the reflected mirrors and then absorbed by the hybrid collector and study the effect of nanofluid on the performance of the system. Solar radiation absorbed by the collector can be increased using the upper and lower reflectors to 1138 W/m 2 while it can reach 950 W/m 2 with the upper reflector and 746 W/m 2 with the lower reflector. It was noticed that when using reflective mirrors, the outlet water temperature increased by 21.7%. Meanwhile, the outlet water temperature increased by 0.44% when nanofluid was used as a cooling medium. The average of daily thermal efficiency as a result of using two reflectors without nanofluid was 62.1%, while the thermal efficiency was 59.735% without using any reflector, meaning a positive effect of using reflectors on the thermal efficiency. The electrical efficiency reduced with the existence of the reflective mirrors, whereas the daily average of the total electrical efficiency without the reflective mirror and using the nanofluid was (14.6%), while with a reflective mirror and using nanofluid, the daily average was (13.67%).

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Section: Temperature Of Outlet Watersupporting

confidence: 92%

“…1 [25]. The Al 2 O 3 was used as nanoparticles in this study, the properties of Al 2 O 3 used for the modelling are summarized from references [26]. Thermophysical properties of the working fluid (Al 2 O 3 -water nanofluid) are changed due to influence of the nanoparticles.…”

Section: Thermophysical Properties Of Nanofluid (Al 2 O 3 -Water)mentioning

confidence: 99%

The combined effect of nanofluid and reflective mirrors on the performance of PV/thermal solar collector

Khalil¹,

Mohammed²

2018

Therm sci

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“…A photovoltaic (PV)/thermal collector is a combination of a solar cell and a solar thermal collector to provide the heat and electricity simultaneously . An increase in PV cell temperature reduces their efficiency, which has been studied in Jie et al, Maadi et al, and Ahmed and Bawa . Hybrid PV/T systems extract the heat from the solar cells and use them to heat air or water for different uses.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of the new design of photovoltaic/storage solar collector

2019

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This study intends to develop a low cost, dependable, and efficient storage solar collector for household uses. This design is based on integrating solar cell technology and the solar storage collector into one system to achieve three objectives: water storage, electricity generation, and water heating. In this design, a solar cell was fixed on the inclined metal surface of a rectangular storage collector and acted as a black absorber surface. Two experimental models were constructed to study the performance of the new design. In the first design, which referred to as photovoltaic (PV)/storage solar collector, the solar cell was fixed on the inclined metal surface and worked as a black absorber surface in the conventional collector. The second model was the rectangular storage collector, similar to the first model with most attributes. The results showed that the outlet water temperature reaches the maximum value of 42°C at 2 pm for the PV/storage collector at spring day, and the temperature differences between the outlet and inlet temperature are 14.6°C and 30°C at 2 pm for the PV/storage collector and the conventional storage collector, respectively. The overall efficiency increases as a result of removing hot water from the collector to cool the solar cell and increases the electrical energy produced. Generally, under load conditions, the overall efficiency of the PV/storage collector is higher than the second design. In the summer, the highest value for the overall efficiency of the PV/storage collector was 63.02% under load condition, whereas the higher value for the overall efficiency was 40.88% without load condition.

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“…Khanjari et al [ 66 ] numerically analyzed the performance of Al 2 O 3 ‐ and Ag‐water NF‐based PVT systems and found that the Ex ov of these systems enhanced by 3.5% and 8.8%, respectively, when compared to a traditional system at ϕ w = 12%. Maadi et al [ 67 ] studied the exergetic performance of PVT systems using Al 2 O 3 , TiO 2 , ZnO, and SiO 2 NPs. They used a 2D‐transient numerical model and validated it experimentally.…”

Section: Thermodynamic Analysis Of Pvt Systemsmentioning

confidence: 99%

Emerging Trends on the Implementation of Nanomaterials for Improving the Performance of Photovoltaic Thermal Systems: Energetic, Exergetic, Environmental, and Economic Perspectives

Tyagi

Kumar

2021

Energy Tech

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This study presents an updated and constructive review that explores the impact of nanomaterials on the photovoltaic thermal (PVT) system performance from energy, exergy, environmental, and economic perspectives. The study employs the various PVT configurations using water, ethylene glycol, nanofluid, phase change material, and nanoenhanced phase change material, as well as a combination of these cooling media at different loadings, to overcome the increased photovoltaic (PV) module temperature levels in the presence of nanomaterials and improve both the cooling and thermal regulation of the PVT systems. The average PV module temperature, temperature gain across the working fluid, thermal, electrical, and overall energetic and exergetic efficiencies, exergy loss, payback period, cost of energy, and CO2 mitigation/year are some of the primary metrics used to evaluate the performance of PVT systems. The study concludes that the use of nanomaterial in PVT systems enhances the energetic and exergetic performance and these systems are effective in decreasing the entropy generation and exergy loss because of their improved heat transfer. The present study also concludes that payback time and cost of energy for the nanomaterial‐based PVT system are lower than that of conventional systems and these systems prevent greenhouse gases emissions in the ecosystem.

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Characterization of PVT systems equipped with nanofluids-based collector from entropy generation

Cited by 94 publications

References 32 publications

The combined effect of nanofluid and reflective mirrors on the performance of PV/thermal solar collector

The combined effect of nanofluid and reflective mirrors on the performance of PV/thermal solar collector

Performance analysis of the new design of photovoltaic/storage solar collector

Emerging Trends on the Implementation of Nanomaterials for Improving the Performance of Photovoltaic Thermal Systems: Energetic, Exergetic, Environmental, and Economic Perspectives

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