Nanofluida Cu dan Cuo dengan Fluida Basis Campuran Air/Etilen Glikol untuk Ekstraksi Energi Geotermal pada Abandoned Well

Ibrahim, Virgiawan (2025) Nanofluida Cu dan Cuo dengan Fluida Basis Campuran Air/Etilen Glikol untuk Ekstraksi Energi Geotermal pada Abandoned Well. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini bertujuan untuk mengevaluasi performa nanofluida berbasis Tembaga (Cu) dan Tembaga Oksida (CuO) dalam fluida basis campuran air/etilen glikol (60:40 v/v) untuk aplikasi ekstraksi energi geotermal dari sumur minyak tua (abandoned oil well) menggunakan sistem Organic Rankine Cycle (ORC). Metode penelitian meliputi sintesis nanopartikel, preparasi nanofluida dengan variasi fraksi massa (0,01% hingga 4%), karakterisasi material menggunakan XRD, SEM, FTIR dan DLS, serta pengujian sifat termal. Performa ekstraksi energi dan sistem ORC kemudian disimulasikan menggunakan CFD (Ansys Fluent) dan UniSim. Hasil penelitian menunjukkan sintesis berhasil dengan ukuran kristalit nanopartikel Cu sebesar 29 nm dan CuO sebesar 15,58 nm, seperti yang diukur oleh XRD. Namun, analisis SEM menunjukkan adanya aglomerasi dengan diameter partikel rata-rata 208 nm untuk Cu dan 237 nm untuk CuO. Uji DLS pada nanofluida Cu juga menunjukkan diameter hidraulik yang besar (310,7 nm) akibat adanya lapisan surfaktan. Nanofluida Cu menunjukkan stabilitas dispersi yang jauh lebih unggul dibandingkan CuO. Peningkatan konsentrasi nanopartikel menurunkan konduktivitas termal, yang mana sejalan dengan teori, kapasitas panasnya juga menurun. Penurunan kapasitas panas ini justru meningkatkan temperatur outlet sumur hingga 72°C. Akibatnya, daya netto sistem ORC dapat meningkat, dengan peningkatan tertinggi dicapai oleh nanofluida CuO 4 wt% sebesar 7,32% (mencapai 3,1730 kW) , diikuti oleh nanofluida Cu 4 wt% sebesar 6,83% (mencapai 3,1586 kW) dibandingkan fluida basis. Peningkatan daya ini diiringi sedikit penurunan pada efisiensi termal dan eksergi, dengan sumber destruksi eksergi terbesar berasal dari turbin (54,9%).
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This study aims to evaluate the performance of Copper (Cu) and Copper Oxide (CuO) based nanofluids in a water/ethylene glycol (60:40 v/v) base fluid for geotermal energy extraction from abandoned oil wells using an Organic Rankine Cycle (ORC) system. The research method included nanoparticle synthesis, nanofluid preparation with varying mass fractions (0.01% to 4%), material characterization using XRD, SEM, FTIR, and DLS, and thermal property testing. The energy extraction and ORC system performance were then simulated using CFD (Ansys Fluent) and UniSim. The results show successful synthesis with Cu and CuO nanoparticle crystallite sizes of 29 nm and 15.58 nm, respectively, as measured by XRD. However, SEM analysis revealed significant agglomeration with average particle diameters of 208 nm for Cu and 237 nm for CuO. DLS testing on the Cu nanofluid also showed a large hydraulic diameter (310.7 nm) due to a surfactant layer. The Cu nanofluid exhibited far superior dispersion stability compared to the CuO nanofluid. An increase in nanoparticle concentration unexpectedly decreased thermal conductivity, but consistent with theory, its specific heat capacity also decreased. This decrease in specific heat capacity, in turn, increased the well outlet temperature up to 72°C. Consequently, the net power of the ORC system increased, with the highest enhancement of 7.32% (reaching 3.1730 kW) achieved by the 4 wt% CuO nanofluid, followed by the 4 wt% Cu nanofluid at 6.83% (reaching 3.1586 kW) compared to the base fluid. This power increase was accompanied by a slight decrease in thermal and exergy efficiencies, with the largest source of exergy destruction originating from the turbine (54.9%).

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Nanofluida, Energi Geotermal, Organic Rankine Cycle, Abandoned Oil Well, Campuran air/etilen glikol, Nanofluid, Geotermal Energy, Organic Rankine Cycle, Abandoned Oil Well, Water/ethylene glycol mixture
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Virgiawan Ibrahim
Date Deposited:	25 Jul 2025 06:09
Last Modified:	25 Jul 2025 06:09
URI:	http://repository.its.ac.id/id/eprint/120782

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