Jurnal Teknik Terapan

Perancangan Desain Sistem Informasi Geografis Potensi Biogas Provinsi Lampung Menggunakan Aplikasi QGIS 3.34

Widiyo Wibowo — 2025-04-27

Lampung, a province in Indonesia with a robust agricultural and livestock sector, exhibits substantial potential for biogas production. Biogas, derived from agricultural residues and animal manure, such as cow and goat dung, presents a sustainable alternative to conventional fossil fuels. Given the escalating global energy demand and environmental concerns, this study endeavors to quantify the biogas potential in Lampung, particularly focusing on the conversion of livestock manure into energy. Employing the QGIS application, this research maps the geographical distribution of biogas potential. Findings indicate that, with optimized management practices, Lampung could produce hundreds of thousands of tons of methane annually, sufficient to partially meet the energy requirements of local households and industries. Beyond energy generation, biogas production can stimulate economic growth, enhance farmers' incomes, and mitigate greenhouse gas emissions. However, the widespread adoption of biogas technology in Lampung is contingent upon addressing several challenges, including technological limitations, public awareness, and the need for conducive policy frameworks.

Pengujian Kinerja Blade Taper Menggunakan Turbin Angin Furling Dengan Variasi Kecepatan Angin, Arah Angin, dan Waktu di Pantai Asmara

Putri Windi Helen Oktaviani — 2025-04-27

With the rapid development of technology and the increasing population growth, energy demand in Indonesia continues to rise. One of the energy potentials that can be harnessed is wind energy, which is an abundant natural resource in Indonesia. The kinetic energy in wind can be used to generate electricity through wind power plants (WPP). This study aims to evaluate the performance of the tapered blades on a furling wind turbine with variations in wind speed and direction at Asmara Beach. The main objective is to determine the effect of wind speed on the performance of tapered blades, analyze the impact of wind direction variations on turbine efficiency and stability, and identify external factors at the location that affect the effectiveness of the furling wind turbine. The results show that the highest recorded power was 9.9968 watts at a wind speed of 4.5 m/s, while the lowest power was recorded at a wind speed of 3.8 m/s, with a power output of 1.516 watts. The generated power was found to fluctuate due to changes in wind speed, causing unstable voltage and current. Wind speed variations have a significant impact on turbine performance, with higher wind speeds generally increasing the power output. However, it is important to note the existence of an optimal wind speed limit to prevent system damage or efficiency degradation. Additionally, wind direction variations also affect turbine stability and efficiency, particularly concerning the furling system's ability to adjust the blade angle to changing wind directions.
Keywords: Wind energy, wind turbin, furling wind turbin

Enhancing DSSC Performance through Metal-Doped TiO₂ and Poly-Tannin Dye: A Study on Bandgap Reduction and Photon Absorption

Hardeli Hardeli — 2025-04-27

Dye-sensitized solar cells (DSSC) are a promising alternative to conventional solar cells by using dye molecules to absorb sunlight and facilitate energy conversion. In this study, tannins were used as the dye. Tannins can be polymerized into poly-tannins, which increases the amount of double bonds and therefore improves photon absorption. Furthermore, this study will also examine how metal doping affects the TiO₂ semiconductor to further enhance its performance. The selected dopants—Cu, Fe, and Ag—were tested for their capacity to change the bandgap and increase electron mobility. Experiments showed that metal doping lowered the bandgap of TiO₂, resulting in better electron excitation and charge transfer. Under optimum conditions, the combination of poly-tannin dye and TiO₂-Ag semiconductor resulted in the highest DSSC efficiency (9.18%). Based on this, it can be concluded that combining metal-doped TiO₂ with poly-tannin dyes can greatly improve DSSC performance.

Pengaruh Variasi Dimple Intake Manifold pada Water Injection System di Mesin 100cc Berbahan Bakar LPG Terhadap Konsumsi Bahan Bakar Spesifik

Novangga Adi Mulyono — 2025-04-27

The number of motorized vehicle users in Indonesia is increasing. Alternative fuels are needed to meet the needs of these motorized vehicles. One of the alternative fuels that can be used is LPG. However, in its application in motorized vehicles, LPG fuel has a weakness, namely that the engine temperature tends to be higher, thus affecting the performance and specific fuel consumption produced. One additional mechanism that can be used to optimize the use of LPG fuel in motorized vehicles is the water injection system. The addition of a water injection system to motorized vehicles is able to maintain the temperature of the combustion chamber, so that it can improve the results of specific fuel consumption. To optimize the use of the water injection system in motorized vehicles, variations in the surface of the intake manifold can be used, namely standard intake, tight dimple and loose dimple. The use of this variation is expected to make the fuel mixture and water injection mix perfectly before entering the combustion chamber. The results of the data collection that have been carried out show that the lowest specific fuel consumption (SFC) is obtained by using a tight dimple intake manifold with water injection with an average value of 0.015882797 kg/HP.hour at an engine speed of 8000 RPM.

Artificial Neural Network Approach for Estimating Biochar Yield from Biomass Composition and Pyrolysis Temperature

Warit Abi Nurazaq — 2025-04-27

Biochar yield from biomass pyrolysis is influenced by complex interactions among feedstock properties and pyrolysis conditions. This study proposes the generation of an artificial neural network (ANN) model to predict biochar yield using input variables including volatile matter, fixed carbon, ash content, elemental composition (C, H, O, N), and temperature on pyrolysis process. A multilayer perceptron (MLP) network was trained using experimental data collected from various biomass sources. The model achieved high performance, with correlation coefficients (R²) of 0.98812 for training, 0.96529 for validation, and 0.94148 for testing. Mean squared error (MSE) analysis showed optimal validation performance at epoch 31, while the error histogram and regression plots confirmed strong predictive accuracy across all datasets. These results demonstrate that ANN is a powerful tool for modeling biochar production, offering a reliable and efficient alternative to labor-intensive experimental methods.

Rancang Bangun Desain Bilah Turbin Angin Taperless Sumbu Horizontal 3 Sudu Menggunakan Material Kayu Mahoni: Studi Eksperimen Sistem Pengereman Elektrik Dynamic Braking dan Performa di Pantai Asmara Jember

Zainal Muttaqien Sulaiman — 2025-04-27

Wind turbines are one of the environmentally friendly conversion tools with one of the main components being blades. Jember is one of the districts of East Java. The average wind speed in Indonesia is relatively low ranging from 3 m/s to 5 m/s. The potential for wind in Indonesia is available almost all year round, so there is a possibility of developing technology to utilize this energy with some previous limitations. Windmill modifications need to be made that are adapted to low wind speed conditions to be able to produce optimal electrical energy. Therefore, a design of HAWT (Horizontal Axis Wind Turbine) blades using mahogany wood material was made by testing the current, voltage, and wind speed system at Asmara Beach, Jember. This study aims to design and evaluate the performance of a taperless bladed wind turbine made from mahogany wood as an alternative environmentally friendly material. The turbine design is optimized through numerical simulation to achieve maximum efficiency. The results show that wind turbines made from mahogany wood have potential as a promising source of renewable energy, especially in areas with moderate wind speeds.

Optimalisasi Desain Reaktor Fotokatalitik untuk Degradasi Formaldehida Menggunakan Substrat Stainless Steel Mesh

Renita Dewi — 2025-04-27

Indoor air quality (IAQ) plays a crucial role in the health and comfort of building occupants, where pollutants like formaldehyde can cause serious health issues. To reduce formaldehyde levels, photocatalytic oxidation (PCO) technology using titanium dioxide (TiO2) substrates has been shown to be effective. This study aims to optimize the PCO system design using TiO2-coated stainless steel mesh substrates in a honeycomb monolith reactor configuration to enhance formaldehyde degradation efficiency. Three variations of stainless steel mesh layers (5, 10, and 15 layers) were tested to evaluate their impact on formaldehyde (HCHO) concentration reduction. The results indicated that increasing the number of mesh layers significantly improved the formaldehyde degradation efficiency. The highest efficiency, 96.06%, was observed with 15 layers, compared to 74.67% with 5 layers and 83.19% with 10 layers. The increase in mesh layers enlarged the surface area of the substrate, enhancing the reaction area and interaction between pollutants and the photocatalyst. This study suggests using more than 10 layers of stainless steel mesh in the PCO system design to achieve optimal performance in formaldehyde pollutant reduction. The findings are expected to contribute significantly to improving indoor air quality, particularly in areas exposed to pollutants such as cigarette smoke.

Analisis Modifikasi Diameter Lubang Intake Manifold Terhadap Performa Sepeda Motor 160 Cc Menggunakan Bahan Bakar Pertamax 92

Aditya Wahyu Pratama — 2025-04-27

The performance of a motorcycle engine is influenced by the efficiency of the air and fuel intake system, where the intake manifold hole diameter plays a crucial role in regulating airflow into the combustion chamber. This study aims to analyze the effect of modifying the intake manifold hole diameter on the performance of a 160 cc motorcycle using Pertamax 92 fuel. The research method involved an experiment by performing porting and polishing on the intake manifold to reduce turbulence. The tested hole diameter variations were 26 mm (standard), 27.50 mm, and 28.50 mm. The test results showed that a 27.50 mm diameter produced the best performance with a torque of 11.50 Nm (4000 rpm), 11.65 Nm (5000 rpm), and 11.92 Nm (6000 rpm). The engine power also increased with results of 11.4 Hp (4000 rpm), 11.5 Hp (5000 rpm), and 11.8 Hp (6000 rpm). The 27.50 mm diameter was proven to provide an optimal balance between torque and power at various engine speeds.