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Sofyan, Sarwo Edhy
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IMPLEMENTASI DESAIN BARU BECAK LISTRIK PENGANGKUT SAMPAH UNTUK TRANSPORTASI RAMAH LINGKUNGAN DENGAN ENERGI TERBARUKAN Hasanuddin, Iskandar; Zulfan, Zulfan; Rahmawati, Sri; Sofyan, Sarwo Edhy; Ikramullah, Ikramullah; Tamlicha, Akram; Aulia, Udink; Syahriza, Syahriza; Darma, Yusria; Lulusi, Lulusi; Putra, Rudiansyah; Ahmadiar, Ahmadiar; Away, Yuwaldi; Herawati, Rama
Jurnal Vokasi Vol 7, No 3 (2023): November
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/vokasi.v7i3.4660

Abstract

Transportasi berkelanjutan dan ramah lingkungan menjadi perhatian utama dalam upaya mengurangi dampak lingkungan dan ketergantungan pada bahan bakar fosil. Pada kegiatan ini desain baru becak listrik pengangkut sampah  menggunakan sumber energi terbarukan untuk mengatasi tantangan transportasi dan pengelolaan sampah. becak ini akan diimplementasikan di daerah Aceh dan sekitarnya, terutama di sekitar kampus Universitas Syiah Kuala, Banda Aceh. Desain inovatif ini menggabungkan karakteristik tradisional becak dengan teknologi energi terbarukan guna menciptakan solusi yang relevan dengan lingkungan setempat. Dalam desain becak listrik baru ini, baterai lithium-ion diintegrasikan sebagai sumber utama, dengan kemampuan pengisian ulang melalui baterai yang dipasang pada struktur becak. Ini menghasilkan manfaat ganda dengan operasional yang lebih ekonomis dan berkontribusi pada lingkungan yang lebih bersih. Implementasi becak listrik ini akan memberikan dampak positif terhadap transportasi sampah di perkotaan Aceh. Selain mengurangi polusi udara dan kebisingan, becak ini akan memfasilitasi akses ke lokasi yang sulit dijangkau oleh kendaraan konvensional. Penting untuk dicatat bahwa kegiatan ini merupakan bagian dari upaya pengabdian kepada masyarakat yang dilakukan oleh Universitas Syiah Kuala. Selain memberikan solusi bagi transportasi dan pengelolaan sampah, desain becak listrik ini dapat menjadi model untuk pengembangan kendaraan listrik lainnya yang menggunakan energi terbarukan. Ini akan memberikan kontribusi penting dalam mengurangi dampak negatif perubahan iklim dan mengurangi ketergantungan pada sumber daya fosil di daerah tersebut. 
A study of co-firing palm kernel shell on the Nagan Raya coal-fired power plant Ansar, Khairil; Syuhada, Ahmad; Sofyan, Sarwo Edhy
Jurnal Polimesin Vol 21, No 6 (2023): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i6.4021

Abstract

Co-firing biomass with coal in existing utility boilers is seen as one strategy for promoting renewable energy with low upfront costs and little to no impact on the boilers' high efficiency. The purpose of this research is to analyse the fuel characteristics and performance of palm kernel shell co-firing at Nagan Raya Coal-Fired Power Plant (CFPP) at various percentages of palm kernel shell combination. The analysis is conducted based on the operational data obtained from Nagan Raya Power Plant. In this study, the characteristics of fuel and the performance of a power plant are analysed based on percentages of fuel variations, namely 100% coal, 95% coal-5% palm kernel shell, and 90% coal-10% palm kernel shell. The results reveal that co-firing's biomass ratio boosted operation parameters, including main steam pressure, temperature, and flow rate. Subsequently, co-firing with 90% coal-10% palm kernel shell has enhanced the power plant output to 90,7 MW compared to those with 100% coal, 95% coal-5% palm kernel shell, namely 89,3 MW and 90,4 MW, respectively
Design optimisation of a shell-and-tube heat exchanger for cold energy recovery in LNG regasification Irfansyah, Haiqal; Sofyan, Sarwo Edhy; Razali, Razali; Tamlicha, Akram
Jurnal Polimesin Vol 23, No 3 (2025): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i3.5589

Abstract

The efficient utilisation of energy resources is a key concern in industrial operations, particularly within the liquefied natural gas (LNG) sector. During the regasification process, substantial amounts of cold energy are released as LNG transitions from its liquid to gaseous state. This cold energy, often wasted by being discharged into the environment, presents an opportunity for recovery and use in various applications such as cold storage and data centre cooling. While the utilisation of LNG cold energy has been widely explored for specific applications, including data centre cooling, electricity generation, and cryogenic systems, existing studies typically focus on individual technologies rather than a comprehensive optimisation of heat exchanger design for cold energy recovery. Therefore, there remains a significant gap in optimising heat exchanger configurations that maximise cold energy extraction while enabling broader industrial integration. This study addresses that gap by optimising the design of a shell-and-tube heat exchanger to recover cold energy from the LNG regasification process at PT Perta Arun Gas, based on an LNG flow rate of 30 million standard cubic feet per day (MMSCFD). The design optimisation was performed using Aspen Exchanger Design and Rating (Aspen EDR) software. Propane was selected as the secondary fluid for extracting cold energy from LNG due to its exceptionally low-temperature performance (freezing point: -188°C) and proven safety in food-related environments. The shell-and-tube heat exchanger design was optimised by the standards and configurations defined by the TEMA designation. The resulting optimal configuration comprises a shell-and-tube heat exchanger with a tube diameter of 13 mm, a tube length of 2,550 mm, a shell diameter of 162.74 mm, a baffle pitch of 135 mm, 16 baffles, a single tube pass, and 54 tubes. This design achieves a heat transfer rate of 478.5 kW, with an estimated cost of USD 23,895.
Twist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbineTwist and chord optimization using the linearization method on the taper blade of a micro-horizontal axis wind turbine Syaukani, Muhammad; Aryadi, Anugrah Wahyu; Arirohman, Ilham Dwi; Sofyan, Sarwo Edhy; Bahar, Aditiya Harjon; Sabar, Sabar
Jurnal Polimesin Vol 22, No 5 (2024): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i5.5540

Abstract

The research aims to optimize the geometry of taper blade profiles for the Horizontal Axis Wind Turbine (HAWT) to improve aerodynamic performance and minimize fabrication complexity. The study used blade linearization as an optimization method for identifying a desirable twist (β) and chord (Cr). This approach enhances accuracy and boosts computational efficiency. It simplifies the optimization process by reducing complexity. In contrast, traditional nonlinear methods are slower and more resource-intensive due to complex aerodynamic interactions. The best β and Cr distributions were found by linearization with elements 1 and 10 of the blade length and positions 5%, 15%, 25%, 35%, 45%, 55%, 65%, 75%, 85, and 95% of the blade elements. The linearization results were used to determine the optimum performance of the HAWT design using simulation. The optimal blades for HAWT were fabricated and their performance evaluated under real wind conditions. The linearization of the 45% twist and chord of elements 1 and 10 provided the best blade shape. Optimized twist and chord yielded HAWT performance with the Cp of 45% to 47% at rotational speeds of 200–900 rpm and wind speeds of 2–10 m/s. Twist and chord optimization increased the Cp from 39.71% to 46.43% with a rotational speed of 550 rpm at a wind speed of 6 m/s, as well as the maximum mechanical power from 424.28 watts to 500.35 watts at a wind speed of 10 m/s. The result from real wind conditions showed that manufactured HWAT produced an average electrical power of 294.19 watts at a rotational speed of 590.66 rpm. These results demonstrate that the optimized design approach presents a close match and is still reasonable in comparison to practical conditions.
Effect of numerous plate holes in a cooling tower on heat transfer optimization Suansyah, Heli; Syuhada, Ahmad; Sofyan, Sarwo Edhy
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4069

Abstract

An industry requires a cooling medium to reduce heat in an industrial machine during operation. Companies generally use cooling towers for engine cooling media. The common issue is that heat reduction and heat transfer rate are not significant. Therefore, a new variation is needed to ensure that the cooling tower can effectively lower the temperature of the machinery. The problem statement aims to determine the parameters that can enhance both the heat transfer rate and the heat transfer coefficient in cooling towers. The objective is to determine the heat transfer rate and heat transfer coefficient. The method used is experimental by varying the water inlet in five variations of the cooling tower plates, they are being 48, 60, 80, 120, and 250 holes. The results showed that the highest temperature difference occurs at Tin 80oC with the variation of 250 holes, which is 9.34oC, and the highest heat transfer value reached 1833.17 watts. Meanwhile, the lowest temperature difference occurred at Tin 60oC with a variation of 48 holes, which is 3,98oC, and the lowest heat transfer value reached 787.47 watts. The highest convection coefficient occurs at Tin 70oC with the variation of 250 holes, which is 117.74 W/m²⋅K. The lowest convection coefficient occurs at Tin 80oC with a variation of 48 holes, which is 77.36 W/m²⋅K. This can be concluded that the temperature difference (⧍T), heat transfer rate, and heat transfer coefficient will increase when the number of holes in each plate variation increases.
Thermodynamic Analysis of Gas Turbine Power Plant of PT PLN Belawan Generation Implementation Unit Sofyan, Sarwo Edhy; Umar, Hamdani; Tamlicha, Akram; Ramafunna, Fitra Ilham
Jurnal Polimesin Vol 22, No 4 (2024): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i4.5365

Abstract

The low quality of the thermodynamic process in a gas turbine power plant results in the waste of potential energy and impacts the power plant's efficiency. Analysing the thermodynamic performance of a gas turbine power plant is crucial to evaluating its efficiency in converting fuel energy into useful work. This analysis helps identify opportunities for improvement and optimise the plant's design for better performance by examining the components (e.g., the compressor, combustion chamber, and turbine). This study aims to evaluate the performance of a Gas Turbine Power Plant (GTPP) through thermodynamic analysis considering the variation of cycle loads. The study was conducted based on the field survey data obtained from the GTPP PT PLN Belawan generation implementation unit. The collected operation data was used to perform a thermodynamic analysis by applying the principles of conservation of mass and energy, along with the laws of thermodynamics. The study examined five cycle load variations: 31.7 MW, 34.3 MW, 48.1 MW, 60.7 MW, and 71.7 MW. Results showed a consistent reduction in the gas turbine heat rate as the load increased, with a significant 53.3% drop in heat rate from 34.3 MW to 71.7 MW. Higher cycle loads also correlated with increased turbine and compressor work, with the turbine producing 55.8% more work than the compressor at 71.7 MW. The turbine's thermal efficiency ranged from 40% to 44%, with potential for a 5% efficiency increase.
Co-Authors . Zulfan Ahmad Syuhada Ahmadiar, Ahmadiar Ansar, Khairil Arirohman, Ilham Dwi Aryadi, Anugrah Wahyu Bahar, Aditiya Harjon Hamdani Umar Hasanuddin, Iskandar Herawati, Rama Ikramullah, Ikramullah Irfansyah, Haiqal Lulusi Lulusi Muhammad Syaukani Raden Mohamad Herdian Bhakti Ramafunna, Fitra Ilham Razali Razali Rudiansyah Putra Sabar Sabar Suansyah, Heli Syahriza, Syahriza Tamlicha, Akram Udink Aulia Yusria Darma Yuwaldi Away