Performance evaluation of direct and indirect absorption linear fresnel reflectors operating with nanofluids /
دراسه استخدام الموائع الدقيقه على مستقبلات فرينل الحراريه بالامتصاص المباشر وغير المباشر
Ali Ashraf Omar Abdelkawi ; Supervised Adel Khalil Hassan Khalil , Muhammed Abdullah Hassan Ahmed
- Cairo : Ali Ashraf Omar Abdelkawi , 2021
- 96 P. : charts , photoghrphs ; 30cm
Thesis (M.Sc.) - Cairo University - Faculty of Engineering - Department of Mechanical Power Engineering
In this study, the performance of a linear Fresnel reflector (LFR) is analyzed using three types of nanofluids (Syltherm800-Cu, Therminol-Al2O3, and water-graphite ) as heat transfer fluids with a range of volume fraction of 0.01% to 6%. A comparison between pure-fluids and nanofluids is conducted regarding thermal efficiency, exergy efficiency, pumping power, and heat transfer coefficient. Nanofluids have a consistently positive impact on the thermal performance of solar collectors which as thermal efficiency enhancement was 4% and 3.3% for a volume fraction of 6% in the case of Therminol-Al2O3 and Sylthem-Cu ,respectively. Regarding the heat transfer coefficient, a constant improvement in values was found when using nanofluids, it reached a maximum of 44% and 35% at a volume fraction of 6% for Therminol Al2O3 and Syltherm-Cu, respectively. With regards to the direct absorption technology, nanofluids show a marked increase in optical and thermal performance, compared to the base-fluid