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Sustainable in Energy Science and Technology
Published by Politeknik Negeri Medan
ISSN : -     EISSN : 31095909     DOI : https://doi.org/10.51510/siest
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics
Sustainable in Energy and Science Technology (SiEST) aims to serve as a multidisciplinary platform for the dissemination of cutting-edge research, innovation, and advancements in the fields of sustainable energy, environmental science, and technological artificial intelligent development. The journal seeks to address global challenges related to energy systems, environmental sustainability, and the integration of science engineering and modelling technologies to promote a sustainable future. The journal publishes high-quality and high-impact Original Research Articles, Review Articles and Short Communication Articles on cutting-edge innovations in research, and recent advances or issues of interest to the energy and science technology community. Sustainable in Energy and Science Technology Scope: 1. Sustainable Energy Systems 2. Applied Engineering and Environmental 3. Physical Sciences 4. Chemical Sciences 5. Engineering Technological Advancements
Arjuna Subject : Energi (semua kategori) - Energi Terbarukan, Keberlanjutan dan Lingkungan
Articles 15 Documents
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Developing a Practicum Module for Air Conditioning (AC) Systems in Refrigeration Engineering Course Putri Meurah Intan; Azhar Syahputra; Muhammad Yusuf; Islami Fatwa
Sustainable in Energy Science and Technology Vol. 2 No. 2 (2026): Sustainable in Energy Science and Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v2i2.3104

Abstract

This study aimed to develop a feasible air conditioning (AC) system practicum module, evaluate its feasibility based on expert validation, and assess student responses to the developed module. A research and development (R&D) approach using the ADDIE model, including analysis, design, development, implementation, and evaluation stages, was employed in the research. The procedure involved a needs analysis, initial module design, product development, expert validation (content and media), and student trial. The subjects included subject-matter experts, media experts, and students as module users. Data were collected using expert validation sheets and student response questionnaires, and analyzed through qualitative and quantitative descriptive techniques. The results showed that content and language feasibility validated by subject-matter experts achieved 93% (highly feasible), media feasibility validated by media experts reached 97% (highly feasible), and student responses reached 86.09% (highly feasible). Therefore, the developed AC system practicum module demonstrates a high level of feasibility and has strong potential as a supporting learning resource for practical activities.
Design and Development of Small-Scale Biodiesel Production Plant: RSM-Based Parameter Optimization Surya Dharma; Siti Maretia Benu; Rahmawaty; Rihat Sebayang; Ulfa Hasnita; Heru Pranoto; Jovian Zefanya Richard Chrisardo Silalahi; Mohamad Ali Ahmad
Sustainable in Energy Science and Technology Vol. 2 No. 2 (2026): Sustainable in Energy Science and Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v2i2.3366

Abstract

The following study outlines the development, optimization, and physicochemical characterization of a mini-biodiesel plant that uses waste cooking oil as feedstock. A 20-liter-capacity batch-type double-jacketed reactor was developed, in which hot air was injected through temperature-controlled nozzles to maintain the reactor contents at an optimum temperature (60–70°C) throughout the reaction process (esterification and transesterification). The system was constructed from stainless steel 304  to provide corrosion resistance and durability. Using Response Surface Methodology (RSM) with a Box-Behnken Design (BBD), the effects of reaction time, catalyst concentration (KOH), and methanol-to-oil molar ratio on biodiesel production were optimized. This indicated a high level of significance for the quadratic model (F-value = 80.17, p < 0.0001) and an R² of 0.9931, representing excellent predictive power. The optimum conditions were found to be 72.37 minutes and 1.37 wt. A 50% methanol ratio and a predicted conversion of 85.1744 were confirmed experimentally, with an average yield of 85.56%. The support frame was structurally tested and found to be mechanically sound under operational loads. The maximum stress (118.6 Pa) was at least three times lower than the material's yield strength. The biodiesel produced showed that it met all international standards (ASTM D6751 and EN 14214), and its FTIR analysis confirmed that the methyl esters were successfully formed. This integrated method is technically feasible, scalable, and cost-effective, providing a pathway for biodiesel production using WCO as a feedstock, which is expected to contribute to sustainable energy and a circular economy.
Sustainable Design of a Compact 3+1 DOF Desktop Robotic Arm for Energy-Efficient Automation Muhammad Shobri; Ignatius Budi Sutanto Hadisujoto; Djati Wibowo
Sustainable in Energy Science and Technology Vol. 2 No. 2 (2026): Sustainable in Energy Science and Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v2i2.3371

Abstract

Fatigue, human error, and reduced productivity are common challenges in industrial operations involving repetitive manual tasks. In response, this paper presents the design, fabrication, and performance evaluation of an affordable, low-cost desktop robotic arm featuring 3+1 degrees of freedom (DoF) integrated with a servo-driven gripper. The mechanical structure was modeled in SolidWorks and fabricated via Fused Deposition Modeling (FDM) 3D printing utilizing Polylactic Acid (PLA) material. To optimize torque transmission and ensure smooth, low-backlash operation, actuation is achieved via NEMA stepper motors coupled with a pulley belt transmission system, controlled by an Arduino microcontroller. Test experiments were conducted to assess mechanical reliability, specifically focusing on positioning repeatability using an analog dial indicator and payload capacity constraints. Experimental results indicate that while the primary link maintains excellent positional consistency across successive cycles, mechanical joint play and inconsistent belt tension introduce slight positional deviations along the base and secondary link axes. Furthermore, load testing demonstrated a maximum payload capacity of 150 grams, with optimal operational stability achieved under 50 grams before structural strain occurs. The developed prototype demonstrates a cost-effective automation architecture for light industrial tasks and offers a robust, accessible open-source platform for robotics education. Ongoing development focuses on integrating feedback sensors, such as encoders and limit switches, to transition the platform from manual control to full closed-loop automation.
Simulation Analysis of Adjustable Bracket Movement in the Design and Construction of a Water Turbine Simulation Device with Adjustable Bracket System Siti Maretia Benu; Muhammad Ahza Zaidan Pramanda; Surya Dharma; Muhammad Anhar Pulungan; Fazril Ideris; Fayaz Hussain
Sustainable in Energy Science and Technology Vol. 2 No. 2 (2026): Sustainable in Energy Science and Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v2i2.3372

Abstract

This study presents the simulation analysis of the adjustable bracket movement in the design and construction of a water turbine simulation device. The background of this research is the untapped renewable energy potential of hydropower plants in Indonesia, which has not reached its desired target. The aim is to design a water turbine simulation device that is effective, efficient, and adaptive to various types of water turbines. The research methods include document study, device design, simulation using SolidWorks 2022, and device testing. Results show that the adjustable bracket system with a universal joint can adjust the working radius angle of the turbine from 90° to 180°, allowing the combination of multiple simulation tools into one integrated device. Moment analysis on the shaft shows the 90° position (Kaplan turbine) has a higher maximum stress (1.136 × 10⁴ N/m²) but lower maximum displacement (2.342 × 10⁻⁵ mm) compared to the 180° position (crossflow turbine) with stress of 8.687 × 10³ N/m² and displacement of 2.775 × 10⁻⁵ mm. Both values remain within safe limits for SS316 material. Actual testing shows the crossflow turbine with a half-opening achieves the most stable rotation (average 619 RPM), while the Kaplan turbine achieves the highest average speed (919 RPM) but with greater variability due to the absence of a flow basin. This simulation tool is expected to serve as a practical learning medium and provide education about the potential of water energy.
IoT-Based Automatic Chicken Feeding System Using ESP32 with Telegram Bot Notification and Web Dashboard Monitoring Bintang Risky Deni; Afritha Amelia; Roslina; Mazlina Abdul Majid; Samsul Bahri
Sustainable in Energy Science and Technology Vol. 2 No. 2 (2026): Sustainable in Energy Science and Technology
Publisher : Politeknik Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51510/siest.v2i2.3373

Abstract

Manual feeding practices in small-scale poultry farming often result in inconsistent feeding schedules, feed waste, and inefficient labour use, particularly when farmers cannot be physically present at the coop. This study designs and implements an Internet of Things (IoT)-based automatic chicken feeding system using the ESP32 microcontroller. The system integrates a load cell with HX711 amplifier for feed-weight monitoring, a servo motor for automated feed dispensing, a DS3231 real-time clock for scheduling, an ESP32-CAM for visual monitoring, a relay module for automated coop lighting, a web-based dashboard, and a Telegram Bot for two-way remote interaction. Testing consisted of functional tests of each component, system-level testing across ten operational scenarios, notification-timing tests, a 24-hour-plus stability log, and field testing on a physical coop for more than three days. Results show the load cell achieved an average error of approximately 1.0 %, the system achieved a 100 % success rate across ten scenarios, the Telegram Bot responded to commands within one minute (consistent with its 3-second polling design, theoretically under 5 seconds), and the system sustained continuous operation for up to 18 hours 16 minutes between manual restarts, with a total observation period exceeding 24 hours. Field testing on a physical coop for more than three days confirmed reliable operation outside laboratory conditions. These findings indicate that the proposed system offers a low-cost, integrated solution for automating feed scheduling, environmental monitoring, and remote interaction for small- to medium-scale poultry farms.

Page 2 of 2 | Total Record : 15

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