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All Journal Journal of Innovation Research and Knowledge Prosiding Seminar Nasional Rekayasa Teknologi Industri dan Informasi ReTII Law and Economics
Alpan Hadi
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences Transportation

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Simulasi Numerik Aerodinamika Turbin Angin Poros Horizontal Hybrid Solar Cell Alpan Hadi
Retii Prosiding Seminar Nasional ReTII ke-12 2017
Publisher : Institut Teknologi Nasional Yogyakarta

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Abstract

Simulasi numerik dilakukan untuk mendapatkan karakteristik aerodinamika turbin angin poros horizontal hybrid solar cell.  Sistem hrybrid pada penelitian ini menggunakan turbin angin poros horizontal (3 blade) sebanyak 3 rotor yang pasang di depan solar cell. Dengan adanya turbin angin di depan solar cell diharapkan dapat menjadi sistem pendingin bagi permukaan solar cell.Penelitian ini dilakukan dengan cara simulasi menggunakan Ansys Fluent. Domain simulasi rotor berbentuk persegi dengan lebar dan tinggi sebesar 8D × 6D (D= Diameter rotor), panjang domain sebesar 11D, bagian upstream rotor sebesar 2D dan downstream sebesar 9D. Metode simulasi pada penelitian ini dibagi 2 yaitu: metode Flow Driven Rotor  (FDR) Simulation dan Multiple Reference Frame (MRF) Simulation. Metode FDR digunakan untuk mendapatkan karakteristik kecepatan putaran rotor, medan aliran dan intensitas turbulen. Metode MRF digunakan untuk mendapatkan nilai torsi. Nilai torsi kemudian digunakan untuk mendapatkan nilai daya.Hasil simulasi berupa data angka, data visual dan grafik. Kecepatan putar maksimum yang dihasilkan rotor 1 sebesar 852,67 rpm, rotor 2 sebesar 834,18 rpm dan rotor 3 sebesar 845,7 rpm. Terjadi penurunan kecepatan angin di belakang turbin karena sebagian sudah diekstraksi menjadi putaran. Intensitas turbulen yang terjadi di daerah downstream 3% - 15%. Daya maksimal yang dihasilkan oleh ketiga rotor sebesar 111,07 Watt dengan CP sebesar 0,364.
AERODYNAMIC PERFORMANCE ANALYSIS OF S809 AIRFOIL APPLICATION ON HORIZONTAL AXIS WIND TURBINE BLADES Hadi, Alpan
Journal of Innovation Research and Knowledge Vol. 5 No. 2: Juli 2025
Publisher : Bajang Institute

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This study analyzes the aerodynamic effects of using the S809 airfoil on the blades of a horizontal-axis wind turbine (HAWT) type AWT-27. The S809 airfoil is designed for low-speed applications, making it aerodynamically suitable for optimizing wind turbine performance in regions with moderate to low wind speeds. Simulations were conducted using Blade Element Momentum Theory (BEMT) based software to evaluate power and power coefficient at various wind speeds. The results indicate that AWT-27 blades with the S809 airfoil deliver better aerodynamic performance at low wind speeds, ranging from 5 m/s to 8 m/s. However, the aerodynamic performance decreases at higher wind speeds, between 9 m/s and 25 m/s. Therefore, AWT-27 blades with the S809 airfoil profile can be an effective alternative for enhancing the performance of horizontal-axis wind turbines, particularly in regions with low wind speeds.
Interpreting Marital Property and Inheritance Rights in Mixed Marriages: A Normative-Transcendental Approach Hadi, Alpan; Erwin, Yulias; Septyanun, Nurjannah; Jiwantara, Firzhal Arzhi
Law and Economics Vol. 19 No. 3 (2025): October: Law and Economics
Publisher : Institute for Law and Economics Studies

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35335/laweco.v19i3.207

Abstract

Intermarriages between Indonesian citizens and foreign nationals are becoming increasingly prevalent in Indonesia's tourist regions, along with the rise of global social and cultural connections. Despite the legal recognition and protection of mixed marriages by Law Number 1 of 1974 regarding Marriage and Law Number 12 of 2006 concerning Citizenship, their execution presents numerous legal challenges, particularly concerning citizenship status, shared property ownership, and inheritance rights. This research employs a normative legal methodology, utilizing literature review as the primary technique, and analyzes Supreme Court Decision No: XXX/Pdt.G/2020/PA.Bdg as a case study. The investigation examined pertinent legal norms, jurisprudence, and relevant legal doctrines by employing a transcendental legal method to comprehend the moral and spiritual principles underpinning these legal frameworks. The study's findings indicate that the national legal system has not adequately addressed the complexities of mixed marriages characterized by divergent legal systems and cultural origins. Restrictions on land ownership by foreign nationals present issues in mixed marriage situations about joint property. Similarly, the disparities in inheritance law systems across civil law, customary law, Islamic law, and foreign frameworks impede equitable arrangements. The transcendental legal approach provides a more inclusive and equitable perspective by grounding legal interpretation in spiritual values. This study advocates for regulatory revisions and the enhancement of international legal frameworks to achieve adaptive and compassionate legal protection that aligns with substantive justice in mixed marriages.
Co-Authors Erwin, Yulias Firzhal Arzhi Jiwantara S, Nurjannah