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All Journal Mekanika: Majalah Ilmiah Mekanika
Syamsul Hadi
Sebelas Maret University

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Effect of Turbine Blades Transformation on Savonius Turbine Performance Muhammad Iyas Abdul Alim; Syamsul Hadi; Dominicus Danardono Dwi Priha Tjahjana
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.48619

Abstract

This study aimed to determine the effect of the transformation of Savonius turbine blades based on the Coefficient of Performance (Cp)-Tip Speed Ratio (TSR) curve. The transformation referred to here is the change in the blade angle so that the area of the cross-section of the returning blade is changed. Therefore, the opposing torque of the turbine obtained from the airflow is reduced. The specimen has three variations, without transformation or conventional turbine, the transformation of 5°, and transformation of 10°. With the reduction in the cross-sectional area of the returning turbine blade, it is expected that the turbine performance will increase. Experiments were carried out using wind tunnels with load variations at an air speed of 5, 6, and 7 m/s. The experimental result shows that the blade transformation movement causes a shift in the center of mass, increasing the turbine vibration that directly affects turbine performance. The negative effect from the vibration is greater than the positive effect caused by reducing negative torque. The experimental results show that conventional turbines have better performance than turbines with 5° and 10° blade transformations.
Usage of Phase Change Material as Heat Storage in Water Desalination Leony Serenauli Pandjaitan; Muhamad Dwi Septiyanto; Syamsul Hadi
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.90218

Abstract

Phase Change Material (PCM) refers to substances that can absorb or release heat, making them effective for heat storage applications. PCMs can be categorized by chemical composition into three primary types: organic, inorganic, and eutectic. In Indonesia, a nation characterized by extended periods of sun exposure, selecting the most suitable PCM for solar still desalination experiments poses a challenge in reducing inefficient practical outcomes. This study investigates the properties of various PCMs and analyzes the essential factors to consider when choosing a PCM for heat storage. The research employs a review method using previously published literature from the Scopus database that incorporates PCM in solar still desalination. The results highlight five critical parameters for evaluation: physical properties, chemical properties, thermal properties, kinetic properties, and economic cost. For optimal compatibility with tropical environments, paraffin wax and soybean wax are the most appropriate choices, whereas coconut oil and beef tallow, which melt faster than wax, are better suited for subtropical regions.
Nanofiber Semiconductor Experiment with Distance Variation Electrospinning Method to Improve DSSC Performance Denny Widhiyanuriyawan; Zainal Arifin; Syamsul Hadi; Muhammad Rijalul Fadli
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 1 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i1.51479

Abstract

Dye-Sensitized Solar Cell (DSSC) is a solar cell that uses dyes to transfer sunlight to electrical energy. DSSC construction uses a layered system (sandwich) that consists of a working electrode and an opposing electrode, both of which are placed on conducting glass and electrolytes to allow electron cycling. DSSC has a high price, so increasing efficiency is needed to use these solar cells more widely. This research aims to determine the effect of the distance between the tip and the rotating collector to increase the efficiency of the Dye-Sensitized Solar Cell (DSSC) and examine its impact on the morphology of the ZnO nanofiber. This experiment is carried out by varying the distance between the tip to the rotating collector, 4 cm, 6 cm, and 8 cm. This research indicates that at a distance of 8 cm, it produces a small, uniform, and stable ZnO nanofiber structure with Voc, Jsc, FF, and DSSC efficiency values of 0.559 V, 9.809 mA/cm2, 43.3%, and 2.3%. In addition, at a distance of 8 cm, it also produces the highest DSSC electrical efficiency from the other distances due to the absorbance of the dye and high electron excitation. 
Co-Authors Denny Widhiyanuriyawan Dominicus Danardono Dwi Priha Tjahjana Leony Serenauli Pandjaitan Muhamad Dwi Septiyanto Muhammad Iyas Abdul Alim Muhammad Rijalul Fadli Zainal Arifin