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All Journal REACTOR : Journal of Research On Chemistry And Engineering Global Advances in Science, Engineering & Technology (GASET)
Oktrison
Politeknik ATI Padang
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering

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Studi Simulasi Konseptual Kinerja Filter Koaleser Berbasis Tandan Kosong Kelapa Sawit (TKKS) untuk Pemisahan Biodiesel-Air Laudi Adytia Pratama; Hafshah Dwiyanti Sutopo; Oktrison; Harmiwati NH
REACTOR: Journal of Research on Chemistry and Engineering Vol. 7 No. 1 (2026)
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v7i1.82

Abstract

This study aims to theoretically evaluate the performance of a liquid-liquid (biodiesel-water) separation system using an Oil Palm Empty Fruit Bunch (OPEFB)-based coalescer filter through a conceptual computational simulation approach. The separation design evaluation was conducted using SuperPro Designer software in batch operation mode with key operating conditions set at a temperature of 60°C. The modelling covered the entire stages, starting from the transesterification reactor, water washing, to the final separation in the coalescer filter unit (P-5). The equipment's performance was evaluated based on the mass fraction profile of the final product compared to the waste stream content. The simulation model projected that the OPEFB coalescer filter shows potential to operate as a heavy and light phase separator based on ideal thermodynamic assumptions. The conceptual product stream composition was dominated by Fatty Acid Methyl Ester (FAME) approaching 100% (>99.99%), with a theoretical water separation efficiency reaching 99.989%, while water, methanol, glycerol, and residual catalyst were comprehensively isolated into the heavy phase (waste) stream. It must be explicitly noted that this is a preliminary simulation study; no physical OPEFB coalescer has been fabricated or experimentally tested, and no analytical confirmation of the critical biodiesel-quality parameters has been conducted. The design of the OPEFB coalescer filter is theoretically feasible in separating post-washing biodiesel-water emulsions, highlighting the necessity to proceed to the physical fabrication and empirical testing stages for actual process validation.
Design and Performance Analysis of a Low-Cost ESP32-Based NAT WiFi Repeater for Indoor IoT Networks Oktrison; Dirja Nur Ilham; Rudi Arif Candra; Erwinsyah Sipahutar
Global Advances in Science, Engineering & Technology (GASET) Vol. 1 No. 2 (2025): Global Advances in Science, Engineering & Technology (GASET), Article Research
Publisher : Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/gaset.v1i2.249

Abstract

The rapid proliferation of indoor Internet of Things (IoT) systems has intensified the need for cost-effective and energy-efficient wireless coverage extension solutions. Conventional commercial WiFi repeaters are often over-provisioned in terms of hardware capability and power consumption, making them unsuitable for small-scale IoT laboratories and energy-constrained environments. Although microcontroller-based platforms such as the ESP32 have been widely used for IoT gateways, their systematic evaluation as Network Address Translation (NAT)-based WiFi repeaters remains limited. This paper presents the design, implementation, and experimental performance evaluation of a low-cost ESP32-based NAT WiFi repeater for indoor IoT networks. The proposed architecture operates in dual-mode (Station + Access Point) configuration using a single 2.4 GHz radio interface and software-based NAT forwarding. Hardware optimization, including Bluetooth deactivation and transmission power tuning, is applied to reduce energy overhead. Experimental measurements conducted in an indoor laboratory environment evaluate throughput, latency, received signal strength indicator (RSSI), and power consumption. Results indicate that the proposed system achieves 15–35 Mbps throughput under single-client conditions, with an average latency increase of 3–8 ms compared to direct router connections. The repeater improves signal strength by up to 18 dB in weak-coverage areas, extending effective indoor coverage by approximately 10–20 m. Measured power consumption remains below 1.2 W during active forwarding, significantly lower than typical commercial repeaters. The main contribution of this work lies in providing a quantified energy–performance characterization of a microcontroller-based NAT repeater.
Co-Authors Candra, Rudi Arif Erwinsyah Sipahutar Hafshah Dwiyanti Sutopo Harmiwati NH Ilham, Dirja Nur Laudi Adytia Pratama