Volume 24, Issue 6 (June 2024)
Modares Mechanical Engineering 2024, 24(6): 385-397 |
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Edalatpour A, Shahdad I, Hosseinalipour S, Moghimi M. Energy and Exergy Analysis of a Direct Absorption Parabolic Solar Collector Enhanced with Multi-Walled Carbon Nanotubes and Titanium Dioxide Nanoparticles. Modares Mechanical Engineering 2024; 24 (6) :385-397
URL: http://mme.modares.ac.ir/article-15-75989-en.html
URL: http://mme.modares.ac.ir/article-15-75989-en.html
1- Iran University of Science and Technology
2- Iran University of Science and Technology ,alipour@iust.ac.ir
2- Iran University of Science and Technology ,
Abstract: (875 Views)
This study investigates the comparative effects of carboxyl-functionalized multi-walled carbon nanotube (MWCNT)/water nanofluids and titanium dioxide (TiO₂) /water nanofluids in direct absorption parabolic solar collectors. To achieve this, a standard testing apparatus was constructed, and the thermal and exergy efficiencies of the collector were calculated using nanofluids at various concentrations. UV/Vis analysis was used to analyze the radiative properties of the nanofluids, and their thermal conductivity was also measured. Experiments were conducted under laminar flow conditions with flow rates of 20, 60, and 100 liters per hour and inlet temperatures of 20, 30, and 40 °C under real conditions with direct solar irradiation. The highest thermal efficiency recorded for the carbon-based nanofluid was 44.96%, while the titanium-based nanofluid achieved a thermal efficiency of 34.98%. Given the substantial improvement in efficiency compared to the base fluid (distilled water), the combined effect of using both nanofluids was also examined, resulting in a maximum thermal efficiency of 48.77%. The exergy efficiency at the highest flow rate and inlet temperature for the base fluid, TiO₂ nanofluid, MWCNT nanofluid, and the hybrid nanofluid were 2.61%, 4.98%, 6.68%, and 7.26%, respectively. The pressure drop of all nanofluids in the absorber tube ranged from 5 to 39.6 Pascals. The studied nanofluids enhance the thermal performance of the system and create low pressure drop, indicating their high efficiency in direct absorption solar collectors.
Keywords: Solar Collector, Direct Absorption, Nanofluid, Multi-Wall Carbon Nanotubes, Titanium Dioxide, Exergy
Article Type: Original Research |
Subject:
Renewable Energy
Received: 2024/07/8 | Accepted: 2024/09/10 | Published: 2024/05/30
Received: 2024/07/8 | Accepted: 2024/09/10 | Published: 2024/05/30
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