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All Journal Jurnal Energi Dan Manufaktur Jurnal Mechanical Turbo : Jurnal Program Studi Teknik Mesin Jurnal Elementer (Elektro dan Mesin Terapan) Infotekmesin Scientific Journal of Mechanical Engineering Kinematika Jurnal Pengabdian Kepada Masyarakat Ungu ( Abdi Ke Ungu) ARMATUR : Artikel Teknik Mesin dan Manufaktur Journal of Applied Science, Engineering and Technology (J. ASET) Open Science and Technology Jurnal Bakti Masyarakat Manajemen Jurnal Polimesin Jurnal Rekayasa Proses Nemui Nyimah
Ahmad Yonanda
University Of Lampung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health Other

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EXPERIMENTAL STUDY OF PARAFFIN-BASED PCM THERMAL STABILITY AFTER REPEATED THERMAL CYCLES FOR ENERGY STORAGE APPLICATIONS Dondi Kurniawan; Muhammad Irsyad; Apri Wiyono; Ahmad Yonanda; Angga Darma Prabowo; Ardika Kusuma
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v11i1.836

Abstract

Paraffin-based phase change materials (PCMs) have great potential in thermal energy storage due to their ability to absorb and release energy during the freezing and melting processes. However, the stability of their thermal characteristics after undergoing repeated heating and cooling cycles remains a challenge for long-term applications. This study aims to evaluate the phase change temperature characteristics and latent heat capacity of paraffin after undergoing 0, 200, 400, and 600 repeated thermal cycles using Differential Scanning Calorimetry (DSC) and T-history tests. The test results show that despite a slight decrease in freezing, melting temperatures changes in chemical structure after a number of cycles, paraffin still maintains its capacity to absorb and release energy quite efficiently. The latent heat capacity decreased from 142.77 J/g to 126.02 J/g over 600 cycles during the melting process. However, during the freezing process, it increased from 139.25 J/g to 147.55 J/g. These findings provide a scientific basis for optimizing paraffin-based PCM for reliable and sustainable thermal energy storage applications.
Analisa Suhu Pembakaran Sampah Kering Sebagai Potensi Energi Panas Untuk Proses Pengeringan Angga Darma Prabowo; Hadi Prayitno; Dondi Kurniawan; Martinus; Ahmad Yonanda
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10423

Abstract

Waste management poses a significant environmental challenge, yet dry waste holds potential as a renewable energy source through Waste-to-Energy (WTE) technology. This study aims to analyze the potential of utilizing heat from dry waste combustion for drying applications using a hybrid approach of experimental methods and Computational Fluid Dynamics (CFD) simulation. The experimental stage was conducted by burning dry waste in a furnace to obtain the average hot gas temperature, which was measured at 295.33°C. This value was then used as a boundary condition in the CFD simulation of an integrated heat exchanger system within the furnace. Air at a temperature of 30°C was flowed into the heat exchanger with four mass flow rate variations (0.087, 0.092, 0.126, and 0.165 kg/s). The simulation results show that the system is capable of heating the air to a temperature range of 46.05°C to 58.05°C, which is ideal for drying applications. An inverse relationship was found between the mass flow rate and the outlet temperature, where a lower flow rate results in hotter air. This research proves that the heat recovery system from dry waste combustion is technically feasible and has the potential to be a sustainable alternative energy solution for drying processes.
Integrated of Aerodinamics Tip and Hub of Wind Turbine on Composite Materials Akhmad Riszal; Agus Sugir; Martinus; Ahmad Yonanda
Journal of Applied Science, Engineering and Technology Vol. 5 No. 2 (2025): December 2025
Publisher : INSTEP Network

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47355/jaset.v5i2.90

Abstract

Global energy consumption is increasing, this is because human needs are dependent on electricity. However, many power plants still depend on fossil fuels, so the impact on the environment is getting bigger as energy consumption increases. It is necessary to develop renewable energy sources, to reduce the use of fossil fuels. One of them is using renewable energy from wind sources. The purpose of this research is to conduct simulations to analyze the aerodynamics and pressure distribution in the tip and hub areas of a wind turbine using QBlade, then conduct experiments in making composite specimens that will later be applied to wind turbines according to the design. This research shows that the highest pressure occurs at the tip and hub of the blade, so it is necessary to improve strong and lightweight materials by using bamboo fiber composites.
Simulasi unjuk kerja kolektor surya hybrid PV/T berdasarkan jarak susunan pipa absorber berbentuk spiral Ahmad Yonanda; Amrizal Amrizal; Harmen Harmen; Hadi Prayitno
TURBO [Tulisan Riset Berbasis Online] Vol 11 No 1 (2022): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v11i1.1906

Abstract

The performance of the solar collector can be reviewed based on several parameters, namely thermal and large fluid drop (pressure drop). This study aims to compare the thermal and pressure drop performance of plate-type solar collectors based on a spiral-shaped pipe arrangement using the distance between the pipes. The comparison of performance analyzed in each study for the distance between the pipes is 25 mm and 50 mm. The approach or stage of research on the performance of the data plate type solar collector is through CFD simulation testing. The simulation stages that will be carried out include: making the geometric design of the solar collector and selecting the mesh method used by the polyhedral type. The results of the solar collector test carried out by CFD simulation show that the use of a 50 mm absorber pipe arrangement has a higher thermal efficiency when compared to the 75 mm absorber pipe arrangement and also a 49.45% increase in pressure drop.
Experimental evaluation of the thermal and exergy performance of a flat spiral-tube receiver for a parabolic dish collector Ahmad Yonanda; Muhammad Raihan Junidy; Muhammad Irsyad; Amrizal Amrizal; Harmen Harmen; Dondi Kurniawan; Angga Darma Prabowo
Jurnal Polimesin Vol 23, No 6 (2025): December
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i6.7557

Abstract

Global dependence on fossil fuels continues to drive the search for cleaner, more sustainable energy sources. One promising technology is the Parabolic Dish Collector (PDC), harnessing concentrated solar energy. The receiver in a PDC is pivotal to overall thermal efficiency and useful energy output. This study evaluates the thermal and exergy performance of a manufactured flat spiral-tube receiver designed to enhance heat transfer. Experiments were conducted under tropical condition between 10:00 and 14:00 local time at three volumetric flow rates (0.5, 0.8, and 1.1 LPM). The 0.5 LPM flow rate yielded the best performance, with a fluid temperature rise up to 43.8°C, a thermal efficiency of 39.1%, and a peak exergy efficiency of 1.1%. The spiral geometry improved fluid residence time, enabling more effective heat absorption. These findings demonstrate that a simple, manufactured spiral tube receiver can improve PDC performance, offering an efficient and cost-effective solution for solar thermal systems.
Evaluasi Termal Heatsink dengan Variasi Arah Aliran pada Sirip Vertikal dan Sirip Bersegmen untuk Pendinginan Pasif Photovoltaic Ahmad Yonanda; Qithfirul Aziz; Amrizal Amrizal; Muhammad Irsyad; Akmad Riszal; Harmen Harmen
TURBO [Tulisan Riset Berbasis Online] Vol 14 No 2 (2025): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v14i2.4549

Abstract

Penurunan kinerja modul Photovoltaic (PV) akibat meningkatnya temperatur permukaan masih menjadi tantangan utama yang membatasi efisiensi konversi energi listrik. Salah satu solusi yang potensial adalah menambahkan heatsink pada bagian bawah modul sebagai media pelepas panas. Penelitian ini bertujuan menganalisis sekaligus membandingkan kinerja termal heatsink dengan konfigurasi sirip vertikal dan sirip bersegmen terhadap variasi arah aliran udara. Simulasi numerik dilakukan menggunakan ANSYS Fluent (CFD) melalui beberapa tahapan: perancangan geometri PV dan heatsink, pembuatan mesh, penentuan boundary condition, serta pengujian variasi sudut aliran udara sebesar 0°, 22,5°, 45°, 67,5°, dan 90° dengan kecepatan 2 m/s. Hasil simulasi menunjukkan bahwa heatsink dengan sirip bersegmen mampu menurunkan temperatur maksimum permukaan PV hingga 3 °C (5,6%) dibandingkan sirip vertikal pada sudut aliran 0°. Selain itu, perubahan sudut aliran memberikan pengaruh lebih besar pada sirip vertikal dengan selisih temperatur rata-rata 1,7 °C, sementara pada sirip bersegmen hanya 0,5 °C. Temuan ini menegaskan bahwa konfigurasi sirip bersegmen lebih adaptif terhadap dinamika arah aliran udara, sehingga berpotensi diterapkan pada kondisi nyata dengan karakteristik angin berubah-ubah. Nilai kebaruan (novelty) penelitian ini terletak pada pemodelan numerik yang secara langsung membandingkan kinerja sirip vertikal dan sirip bersegmen terhadap variasi arah aliran — topik yang masih jarang dilaporkan dalam studi pendinginan pasif PV.
Co-Authors A.Yudi Eka Risano, A.Yudi Eka Agus Sugir Agus Sugiri, Agus Ahmad Riszal Ahmad Suudi Akhmad Riszal Akmad Riszal Amrizal Amrizal Amrizal Amrizal Amrizal Amrizal Amrizal Amrizal Amrizal Amrizal Nalis Amrul Amrul Amrul Angga Darma Prabowo Angga Darma Prabowo Angga Darma Prabowo Apri Wiyono Ardika Kusuma Aziz, Qithfirul David Sinaga Dedy Prasetyo Dondi Kurniawan Dondi Kurniawan Effendi, M. Fadhly Hadi Prayitno Hadi Prayitno, Hadi Hakim, Naufal Harmen Harmen Harmen Harmen Harmen Harmen Harmen Harmen Harmen Harmen, Harmen Ibrahim, Fauzi Khairudin, Rizal M. Haviz M. Irsyad Marsyad, Hardoyo Martinus Martinus Martinus Martinus, Martinus Muhammad Irsyad Muhammad Irsyad Muhammad Irsyad Muhammad Raihan Junidy Nalis, Amrizal Nugraha, Nurcahya Nugraha, Yulian Qithfirul Aziz Ramadani, Tri Topan Riszal, Akhmad Riszal, Akmad Rizal Khairudin Sabiqunassabiqun Sagala, Surya Jonathan Setiawan, Ahmad Adi Sinaga, David Sinaga, Jorfri B. Sinaga, Jorfri Boike Sinaga, Jorfri Boyke Sugiman Yeni Elisdiana