Investigasi Potensi Penggunaan Nanofluida Untuk Ekstraksi Energi Pada Abandoned Geothermal Well

Syaharussajali, Syaharussajali (2024) Investigasi Potensi Penggunaan Nanofluida Untuk Ekstraksi Energi Pada Abandoned Geothermal Well. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Indonesia memiliki potensi geothermal sebesar 24 Gigawatts (GW) yang menjadikan Indonesia sebagai negara terbesar kedua yang memiliki potensi geothermal. Biaya investasi yang tinggi masih menjadi tantangan dalam pengembangan energi geothermal, yang mana biaya drilling sumur geothermal menjadi yang paling mahal dengan biaya lebih dari 50% dari total biaya proyek. Salah satu solusi untuk masalah tersebut adalah retrofitting abandoned wells dengan sistem closed loop well (double pipe heat exchanger). pemanfaatan kembali abandoned wells untuk diekstrak energi panasnya hanya membutuhkan biaya sekitar sepertiga dari pembuatan sumur geothermal baru. Namun rendahnya nilai heat transfer dari sistem ini menjadikannya jarang untuk diterapkan sebagai pembangkit listrik. Oleh karena itu pada penelitian thesis menganalisis pengaruh penambahan nanopartikel (core-shell ZnO@TiO2, TiO2, dan CuO) dalam base fluid (water) double pipe well sebagai solusi untuk meningkatkan performa heat transfer. Pengaruh nanopartikel terhadap closed loop well dimodelkan dengan pendekatan simulasi CFD. Hasil simulasi CFD akan digunakan sebagai input dalam menghitung performa sistem Organic Rankine Cycle yang digunakan untuk menentukan potensi pembangkitan listrik. Hasil simulasi performa sistem equipment penyusun sistem Organic Rankine Cycle kemudian digunakan untuk menentukan biaya investasi sistem double pipe well dengan Organic Rankine Cycle. Biaya investasi dan aspek variabel proses lalu dipilih variasi nanopartikel paling optimum berdasarkan metode TOPSIS AHP. Berdasarkan penelitian ini penambahan nanopartikel pada base fluid dapat meningkatkan konduktivitas termal secara linier seiring bertambahnya konsentrasi. Sementara itu power output terbesar diperoleh dari variasi nanopartikel CuO konsentrasi 4% dengan kenaikan power output 78%. Namun berdasarkan perhitungan dengan metode MCDM yang memepertimbangkan aspek teknis dan ekonomi mennjukkan variasi paling optimum justru pada nanopartikel TiO2 dengan konsentrasi 0,2%wt.
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Indonesia has a geothermal potential of 24 Gigawatts (GW), which makes Indonesia the second largest country with geothermal potential. High investment costs are still a challenge in developing geothermal energy, with the cost of drilling a geothermal well being the most expensive at more than 50% of the total project cost. One solution to this problem is retrofitting abandoned wells with a closed loop well system (double pipe heat exchanger). Reusing abandoned wells to extract heat energy only costs about a third of building a new geothermal well. However, the low heat transfer value of this system makes it rarely used as a power generator. Therefore, the thesis research analyzes the effect of adding nanoparticles (core-shell ZnO@TiO2, TiO2, and CuO) in the base fluid (water) double pipe well as a solution to improve heat transfer performance. The effect of nanoparticles on the closed loop well is modeled using a CFD simulation approach. The results of the CFD simulation will be used as input in calculating the performance of the Organic Rankine Cycle system which is used to determine the electricity generation potential. The results of the performance simulation of the equipment system that makes up the Organic Rankine Cycle system are then used to determine the investment costs for a double pipe well system with the Organic Rankine Cycle. Investment costs and process variable aspects then selected the most optimum nanoparticle variation based on the TOPSIS AHP method. Based on this research, the addition of nanoparticles to the base fluid can increase thermal conductivity linearly as the concentration increases. Meanwhile, the largest power output was obtained from a variation of CuO nanoparticles with a concentration of 4% with an increase in power output of 78%. However, based on calculations using the MCDM method which takes into account technical and economic aspects, it shows that the most optimal variation is TiO2 nanoparticles with a concentration of 0.2% wt.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	Computational fluid dynamics, Double pipe heat exchanger, Organic rankine cycle, Retrofitting abandoned wells
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers T Technology > TP Chemical technology > TP248 Nanogels. Nanoparticles.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Physics > 45101-(S2) Master Thesis
Depositing User:	Syaharussajali Syaharussajali
Date Deposited:	21 Aug 2024 05:15
Last Modified:	21 Aug 2024 05:15
URI:	http://repository.its.ac.id/id/eprint/115392

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