Journal
RENEWABLE ENERGY
Volume 170, Issue -, Pages 410-425Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.01.117
Keywords
PVT system; Rifled serpentine tubes; Nanofluid; Concentrations; Energy efficiency; Exergy efficiency
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This experimental study compares the energetic and exergetic performance of a base PVT system with sheet-and-plain serpentine tube collector with two modified PVT systems. It is found that the 6-start rifled PVT system achieved the highest overall energy and exergy efficiency at a flow rate and concentration of 80 kg/h and 2%. The electrical power generated by the different PVT systems also showed significant enhancements compared to the PV module without cooling.
This experimental study aims to energetically and exergetically compare the performance of a PVT system with sheet-and-plain serpentine tube collector (base PVT system) with two cases of modified PVT systems. The modified PVT systems are the replacements of plain serpentine tube with rifled serpentine tube with 3 ribs (3-start rifled PVT system) and 6 ribs (6-start rifled PVT system). The electrical parameter of the PV module without cooling is compared with the three cases of the PVT system with cooling. The cooling fluid is water/magnetite nanofluid. The effect of nanofluid flow rates (20-80 kg/h) and nano additive volume concentrations (0-2%) over the three cases of the PVT system is investigated to propose a suitable combination of flow rate and NA concentration offering the best energetic and exergetic performances. Thus, the 6-start rifled PVT system achieved a maximum of 22.5% and 3.8% higher overall energy efficiency, and 5.9%, and 1.9% higher overall exergy efficiency than the base and 3-start rifled PVT systems at flow rate and concentration of 80 kg/h and 2%. Finally, the electrical power generated by the base, 3-start rifled, and 6-start rifled PVT systems achieved maximum enhancement of 27.5%, 29.5%, and 31.5% compared to the PV module without cooling. ? 2021 Elsevier Ltd. All rights reserved.
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