Analisis Pengaruh Geometri Absorber serta Level Air Pada Solar Still Terhadap Efisiensi Sistem Desalinasi Air Laut

Purnomo, Happy Ayu Salasaty (2026) Analisis Pengaruh Geometri Absorber serta Level Air Pada Solar Still Terhadap Efisiensi Sistem Desalinasi Air Laut. Diploma thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Ketersediaan air bersih menjadi permasalahan penting, terutama pada wilayah pesisir yang memiliki keterbatasan akses terhadap air layak konsumsi. Salah satu teknologi desalinasi sederhana yang dapat digunakan adalah double slope solar still, yaitu sistem yang memanfaatkan energi matahari untuk menguapkan air laut dan mengondensasikannya menjadi air tawar. Penelitian ini bertujuan untuk menganalisis pengaruh variasi geometri absorber, jumlah fin, dan level air terhadap efisiensi sistem double slope solar still. Variasi yang digunakan meliputi flat plate absorber, rectangular elongated fin, dan inclined rectangular elongated fin dengan jumlah fin 7, 10, dan 13, serta level air 2 cm, 3 cm, 4 cm, 5 cm, dan 6 cm. Metode penelitian dilakukan melalui pengujian eksperimen dan simulasi CFD untuk mengevaluasi distribusi temperatur dan performa termal sistem. Hasil penelitian menunjukkan bahwa pada konfigurasi flat plate absorber, efisiensi tertinggi diperoleh pada level air 2 cm sebesar 18,04%, sedangkan efisiensi menurun hingga 12,93% pada level air 6 cm. Penambahan fin meningkatkan efisiensi sistem secara signifikan dibandingkan flat plate, dimana pada level air 3 cm efisiensi meningkat dari 17,70% pada flat plate menjadi 32,53% pada 13 rectangular elongated fin dan 33,96% pada 13 inclined rectangular elongated fin. Konfigurasi optimum diperoleh pada 13 inclined rectangular elongated fin dengan level air 3 cm, dengan efisiensi tertinggi sebesar 33,96% dan nilai Q_evap tertinggi sebesar 2237,99 W. Hasil ini menunjukkan bahwa kombinasi jumlah fin, orientasi fin miring, dan level air 3 cm mampu meningkatkan perpindahan panas serta pemanfaatan energi evaporasi pada sistem. Dengan demikian, konfigurasi 13 inclined rectangular elongated fin pada level air 3 cm direkomendasikan sebagai konfigurasi terbaik untuk meningkatkan efisiensi double slope solar still.
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The availability of clean water remains an important issue, particularly in coastal areas with limited access to potable water. One simple desalination technology that can be used is a double slope solar still, which utilizes solar energy to evaporate seawater and condense the vapor into freshwater. This study aims to analyze the effects of absorber geometry, number of fins, and water level on the efficiency of a double slope solar still. The absorber variations include a flat plate absorber, rectangular elongated fin, and inclined rectangular elongated fin with 7, 10, and 13 fins, while the water levels are varied at 2 cm, 3 cm, 4 cm, 5 cm, and 6 cm. The research was conducted through experimental testing and CFD simulation to evaluate temperature distribution and thermal performance. The results show that for the flat plate absorber, the highest efficiency was obtained at a water level of 2 cm, with an efficiency of 18.04%, while the efficiency decreased to 12.93% at a water level of 6 cm. The addition of fins significantly improved the system efficiency compared to the flat plate absorber. At a water level of 3 cm, the efficiency increased from 17.70% for the flat plate absorber to 32.53% for the 13 rectangular elongated fin and 33.96% for the 13 inclined rectangular elongated fin. The optimum configuration was achieved by the 13 inclined rectangular elongated fin at a water level of 3 cm, with the highest efficiency of 33.96% and the highest Q_evapvalue of 2237.99 W. These results indicate that the combination of fin number, inclined fin orientation, and a 3 cm water level can improve heat transfer and enhance evaporative energy utilization in the system. Therefore, the 13 inclined rectangular elongated fin configuration at a water level of 3 cm is recommended as the best configuration for improving the efficiency of the double slope solar still.

Item Type:	Thesis (Diploma)
Uncontrolled Keywords:	Double slope solar still, desalinasi, Absorber fin, geometri absorber, level air, clean water sanitaion, desalination, absorber geometry, water level.
Subjects:	Q Science > QC Physics > QC320 Heat transfer T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting. T Technology > TJ Mechanical engineering and machinery > TJ810.5 Solar energy
Divisions:	Faculty of Industrial Technology > Physics Engineering > 30201-(S1) Undergraduate Thesis
Depositing User:	Happy Ayu Salasaty Purnomo
Date Deposited:	01 Aug 2026 02:47
Last Modified:	01 Aug 2026 02:47
URI:	http://repository.its.ac.id/id/eprint/141393

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