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All Journal Eksergi: Chemical Engineering Journal KOVALEN: Jurnal Riset Kimia CHEESA: Chemical Engineering Research Articles Eduvest - Journal of Universal Studies Journal Serambi Engineering (JSE) Journal of Green Science and Technology Scientific Contributions Oil and Gas
Yusuf, Yusmardhany
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Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Neuroscience Social Sciences Transportation

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Utilization of Coconut Shell and Coffee Grounds as Briquettes Using the Carbonization Method Adhitasari, Alfiana; Manfaati, Rintis; Paramitha, Tifa; Zahwa, Keisya Adellia; Setiawan, Kiranna Shalmadevy; Yusuf, Yusmardhany
Eksergi Vol 22 No 3 (2025)
Publisher : Prodi Teknik Kimia UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i3.15128

Abstract

Biomass-based briquettes offer a renewable energy alternative that can help reduce CO₂ emissions. Coconut shells and coffee grounds are promising waste materials due to their high calorific value. This study aimed to optimize the composition and carbonization time in producing briquettes from these two materials. The briquettes were prepared following SNI 01-6235-2000 and export briquette standards. The process included drying, carbonization at 300 °C for 60, 90, 120, 150, and 180 minutes, sieving, mixing, molding, and drying. Coconut shells and coffee grounds were mixed at weight ratios of 9:1, 8:2, 7:3, 6:4, and 5:5 with a total of 46.5 grams and 8.5 grams of adhesive. Briquette quality was evaluated based on moisture content, ash content, volatile matter, density, calorific value, and fixed carbon. The 9:1 composition yielded the highest calorific value of 6,472 cal/g, while a carbonization time of 90 minutes produced the best calorific value of 6,504 cal/g. The results show that a high proportion of coconut shells with limited coffee grounds and optimal carbonization time can produce briquettes with high energy potential, suitable for use as an alternative fuel.
Techno-Economic Design of Onshore Gas Pipelines with High CO₂ and H₂S Content Pamungkas, Joko; Pramadewi , Indrianti; Hermawan, Yulius Deddy; Yuliestyan, Avido; Yusuf, Yusmardhany; Kurniawan, Aditya; Ramadhan, Muhammad Redo; Anggorowati, Heni; Perwitasari; Wulandari, Mutiara; Lazuardi, Muhammad Daffa
Scientific Contributions Oil and Gas Vol 49 No 1 (2026)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/scog.v49i1.2023

Abstract

This study develops a simulation-based techno-economic framework for designing an onshore gas trunkline system to accommodate production from newly developed wells in the X and Y Fields. The system transports 35 MMSCFD of untreated natural gas containing approximately 60 mol% CO₂ and 70 ppm H₂S, where high acid gas content and declining wellhead pressure impose constraints on pressure delivery, flow velocity, material selection, and lifecycle cost. Steady-state hydraulic simulations were performed using UniSim R490 to evaluate early- and mid-life production scenarios based on pressure drop and erosional velocity ratio (EVR) in accordance with API RP 14E. Comparative analysis of candidate pipeline diameters shows that a 12-inch trunkline maintains a minimum delivery pressure of 50 psig while keeping EVR below unity, thereby satisfying hydraulic and mechanical integrity requirements without excessive recompression. The integration of an onshore booster compressor mitigates reservoir pressure decline and sustains gas transport to the central processing facility. Material selection analysis identifies duplex stainless steel and SS 316 as technically viable options for CO₂-H₂S service under controlled operating conditions. Techno-economic evaluation indicates that the selected configuration minimizes total lifecycle cost relative to alternative designs, with estimated CAPEX of USD 228.43 million and annual OPEX of USD 142.19 million. The results demonstrate that integrated hydraulic optimization, sour-service material selection, and economic assessment provide a robust and economically optimized design approach for onshore sour gas pipeline systems.
Estimating Worst-Case Carbon Monoxide Exposure Uncertainty Using Deterministic and Monte Carlo Methods Southward from UPN Seturan Intersection, Yogyakarta Yusuf, Yusmardhany; Dwi Amalia; Alfiana Adhitasari; Kadek Chelsy Zahra; Anggita Nur Widyastuti
Jurnal Serambi Engineering Vol. 11 No. 2 (2026): April 2026
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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Abstract

Carbon Monoxide (CO) is a critical urban pollutant with severe health implications, primarily driven by vehicular emissions in high-density traffic zones. This study investigates the spatial dispersion of CO along the main road located towards the south of the Universitas Pembangunan Nasional (UPN) Seturan Depok intersection, extending 150 meters to the south (Jalan Seturan Raya) in Condongcatur Sleman Yogyakarta, aligning with specific sampling positions located directly amidst the traffic stream to capture immediate exposure levels. This research addresses the limitations of deterministic approaches based on the advection-diffusion equation, which often fail to fully account for the random fluctuations of atmospheric turbulence inherent in complex urban environments. To address this, the study integrates direct field measurements with a probabilistic algorithm that treats the diffusivity coefficient as a random variable governed by the Peclet number. The results demonstrate that the Monte Carlo simulation achieves a predictive accuracy (R2 = 0.9393) which, while slightly lower than the analytical model (R2 = 0.9522), remains highly robust as it successfully accounts for the chaotic, random nature of real world atmospheric turbulence. Furthermore, the simulation identifies a critical high-risk zone within 40 meters of the source where concentrations consistently exceed 35 mg/m³ due to diffusion-dominated transport.
Co-Authors -, Alfiana Adhitasari Aditya Kurniawan Alfiana Adhitasari Anggita Nur Widyastuti Asyari, Restu Adji Alif Augustina, Nadya Avido Yuliestyan Bambang Soeswanto Clarisa, Shintiya DWI AMALIA Fatah, Khalaida Fania Gunawan, Sinna Chaerunnabila Hariyadi, Tri Heru Suharyadi Joko Pamungkas Kadek Chelsy Zahra Khalilullah, Hanif Kristanto Jiwo Saputro Kurnia, Dianty Rosirda Dewi Lazuardi, Muhammad Daffa Luviana, Angely Manfaati, Rintis Muhammad, Bagoes Nur Muhari, Emma Hermawati Nugraha, Ganjar Paramitha, Tifa perwitasari Perwitasari Perwitasari Pramadewi , Indrianti Putri, Alifhah Ananda Ramadhan, Muhammad Redo Rizky, Alfiani Samuel Samuel Sari, Sindi Mutika Sarip, Fahmi Haddad Setiawan, Kiranna Shalmadevy Sihombing, Rony Sihombing, Rony Pasonang Suryadi, Joko Trirahayu, Dhyna Analyes Unung Leoanggraini Wulandari, Mutiara Yulius Deddy Hermawan Yusuf, Nur Reza Muhammad Zahwa, Keisya Adellia