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All Journal Simetris FLYWHEEL : Jurnal Teknik Mesin Untirta Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat WIDYAKALA JOURNAL JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY SCIENCE TECH: Jurnal Ilmiah Ilmu Pengetahuan dan Teknologi JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN Jurnal Teknik Mesin Indonesia Jurnal Engine: Energi, Manufaktur, dan Material Abdimasku : Jurnal Pengabdian Masyarakat Jurnal Pendidikan Teknik Mesin Undiksha JURPIKAT (Jurnal Pengabdian Kepada Masyarakat) Jurnal Masyarakat Indonesia Cakrawala: Jurnal Pengabdian Masyarakat Global AutoMech : Jurnal Teknik Mesin TEKNOSIA Jurnal Mesin Sains Terapan International Journal of Mechanical, Industrial and Control Systems Engineering
Nur Hayati
Universitas Tidar
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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Perancangan dan analisis termal tabung pemanas berbasis heat exchanger coil menggunakan refrigeran R32 untuk sistem water jacket bioreaktor fermentasi kopi Bariq Firmanda; Trisma Jaya Saputra; Nur Hayati; Arif Rahman Saleh
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10485

Abstract

Temperature control is a crucial factor in the coffee fermentation process, as it influences both microbial activity and the quality of the final product. This study aimed to design a heating unit based on a shell-and-coil heat exchanger, utilizing R32 refrigerant as the heat source for the water jacket system of a coffee fermentation bioreactor. The design was developed using the Log Mean Temperature Difference (LMTD) method and subsequently validated through Computational Fluid Dynamics (CFD) simulation using ANSYS Fluent. Calculations yielded a heating unit with a capacity of 137.4 L, a coil length of 22.02 m, and a heat transfer rate of 1,354 W. Simulation results showed the water temperature rising from 27°C to 48°C, while the refrigerant temperature dropped from 90°C to 69.9°C. The simulation results differed from the theoretical values by approximately 2°C, indicating that the design effectively meets the heating requirements of the water jacket system. This research demonstrates that utilizing heat from an air conditioner condenser with R32 refrigerant offers a potential alternative for an efficient heating system in coffee fermentation bioreactors.
Analisis distribusi temperatur reaktor gasifikasi downdraft multi-stage berbasis kontainer menggunakan simulasi termal Alvin Indi Lazuardi; Trisma Jaya Saputra; Nur Hayati; Arif Rahman Saleh
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10458

Abstract

Coffee husk waste is a promising biomass resource for renewable energy production through gasification; however, its utilization remains relatively limited. This study aimed to design a container-based downdraft gasification reactor with a processing capacity of 50 kg/h and evaluate its thermal performance through temperature distribution analysis using SolidWorks Simulation. The reactor dimensions were determined based on stoichiometric calculations with an equivalence ratio (ER) of 0.3, resulting in a reactor diameter of 760 mm, a height of 1900 mm, a throat diameter of 234 mm, and a nozzle diameter of 34 mm. Thermal simulations were conducted under steady-state conditions using Stainless Steel (SS) 310S as the reactor material. The applied thermal loads were 269.651°C in the drying and pyrolysis zone, 759.150°C in the oxidation (throat) zone, 250.843°C in the reduction zone, and 140.045°C at the grate, with a natural convection boundary condition of 5 W/(m²·K). The results showed that the highest temperature of 759.150°C occurred in the throat region, while the maximum outer surface temperature reached approximately 59.566°C. The estimated convective heat loss to the surrounding environment was 0.78 kW, equivalent to only 0.31% of the biomass energy input, indicating that the selected SS 310S material and wall thickness configuration provided effective thermal insulation. These findings provide a practical reference for the design and thermal optimization of safe and efficient container-based biomass gasification reactors
Desain dan simulasi statik rangka alat sortir buah kopi Tegar Indarto; Nur Hayati; Arbye S. Arbye S.; Trisma Jaya Saputra; Arif Rahman Saleh
Jurnal Mesin Sains Terapan Vol 10, No 2 (2026): JURNAL MESIN SAINS TERAPAN
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jmst.v10i2.10475

Abstract

Manual coffee cherry sorting has limitations in terms of capacity, consistency, and efficiency, making it necessary to develop a sorting machine with a strong, safe, corrosion-resistant, and cost-effective structure. This study aims to design the frame of a coffee cherry sorting machine and determine the most suitable materials for the frame and hopper through static structural simulation. The design was developed using SolidWorks, while the structural analysis was conducted using SolidWorks Simulation based on the Finite Element Analysis (FEA) method to evaluate the von Mises stress, displacement, and Factor of Safety (FOS). The simulation results indicate that Galvanized Steel is the most suitable material for the machine frame, as it provides safe structural performance with maximum stress below the material’s yield strength, low displacement, and Factor of Safety that satisfies engineering safety requirement. In addition, Galvanized Steel offers better corrosion resistance and material cost efficiency than the other evaluated materials. For the hopper, Stainless Steel 201 demonstrated the best performance, achieving an excellent structural strength and corrosion resistance for coffee cherry handling applications. Based on the static simulation and cost analysis, Galvanized Steel is recommended as the frame material, while Stainless Steel 201 is recommended as the hopper material because they provide the best balance of structural strength, safety, corrosion resistance, and cost efficiency
Co-Authors , Raka Mahendra Sulistiyo -, Diyono Achmad Aziizudin Adi Purwanto Adi Purwanto Adityo Noor Setyo H.D Adityo Noor Setyo Hadi Darmo Alvin Indi Lazuardi Arbye S Arfanindita, Her Tafga Arif Rahman Saleh Bariq Firmanda Ceren, Tiko Es Saputra Erwan Muladi Erwan Muladi Faiz Listyanda Fajarningrum, Nurmala Dyah Fidaroin, Arsyad Ni'am GALIH PRATAMA I Gusti Gde Badrawada M. Fendy Kussuma H.S M. Fendy Kussuma Hadi Sufyan Maulana, Rizki Muchammad Insan Brilian Muhammad Hilmi Hanafi Mujiarto, Sigit Nurmala Dyah Fajarningrum Nurmala Dyah Fajarningrum Raka Mahendra Sulistiyo Saleh, Arif Rahman Saleh, Arif Rahman Satriawan Dini Hariyanto Susilo, Gunawan Budi Tegar Indarto Trisma Jaya Saputra Yudha, Venditias