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Tulus Burhannudin Sitorus
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Faculty of Engineering, University of Sumatera Utara J17 Building 3rd Floor Mechanical Engineering Department Jl. Almameter Kampus USU Medan Telp.061-8213250, Fax 061-8213250
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Dinamis
Published by TALENTA PUBLISHER
ISSN : 02167492     EISSN : 28093410     DOI : https://doi.org/10.32734/dinamis
Core Subject : Science, Education, Engineering,
Education Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Transportation
Focus and Scope Dinamis Journal is a national electronic journal as a means to publish scientific works in Mechanical engineering and other relevant fields. This journal has strengths and focuses on the sub-fields of energy conversion, structural materials and materials engineering, production processes, and maintenance systems which are all part of mechanical engineering science. This journal is managed by the Department of Mechanical Engineering, Faculty of Engineering, University of Sumatera Utara. Scientific works published in the Dinamis Journal are the results of research, both experimental, literature reviews, and simulations and contribute significantly to the development of science and technology. The Dinamis Journal publishes scientific papers in the field of Mechanical engineering related to the following fields of study: Experimental and Computational Mechanical Systems Solar Energy Fuel Cell Noise and Vibration Alloy and Processing
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 253 Documents
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Risk Analysis of Potable Water Service Improvement in PDAM Malang City Rona Rofida; Fadhila Fadhila; Calysta Deli Ad’hani
DINAMIS Vol. 14 No. 1 (2026): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v14i1.25208

Abstract

PDAM Malang has legally and technically provided potable drinking water through the Zona Air Minum Prima (ZAMP) program. Although most service areas have met ZAMP requirements, several areas still require improvements in service quality. The development of potable drinking water services requires substantial investment and faces technical, operational, and financial risks that may affect project performance and sustainability. This study analyzes the risks associated with improving potable drinking water services in PDAM Malang under a Public Private Partnership (PPP) scheme, focusing on risk allocation and mitigation strategies throughout the project lifecycle. A mixed-methods approach was employed, combining qualitative and quantitative techniques. Risks were identified through semi-structured interviews with five experts selected using purposive sampling. Risk assessment used the water sector risk matrix developed by PT Penjaminan Infrastruktur Indonesia, based on probability and impact scores ranging from 1 to 5. The results show that the dominant risks during the pre-construction stage were land acquisition delays and design errors, each with a risk score of 12. During construction, the highest risk was unclear output specifications, with a risk score of 20. In the operational stage, inaccurate life-cycle cost estimation and low initial service uptake were identified as the most critical risks, each scoring 25. The operational stage exhibited the highest overall risk level and was predominantly allocated to the private sector partner. These findings highlight the importance of appropriate risk allocation and effective mitigation strategies to ensure the sustainable delivery of potable drinking water services under a PPP framework.
Structural Strength Simulation of an Archimedes Screw Turbine Casing for MicroHydropower Applications suherman Suherman; Tri Imam Sugatra; Ahmad Yunus Nasution
DINAMIS Vol. 14 No. 1 (2026): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/dinamis.v14i1.25283

Abstract

The Archimedes screw turbine (AST) has emerged as a promising technology for low-head micro-hydropower generation due to its simple configuration, high operational efficiency, and environmental compatibility. Nevertheless, studies addressing the structural performance and mechanical reliability of AST casing systems remain limited, particularly under different static loading conditions. This study aims to evaluate the structural strength of an ASTM A36 steel casing for an Archimedes screw turbine using finite element analysis in SolidWorks 2020. The novelty of this research lies in the integrated structural assessment of a closed-type AST casing, analysing stress distribution, strain behaviour, displacement characteristics, and factor of safety under various loading conditions prior to practical implementation. Static loads of 55.154 N, 57.704 N, and 84.584 N were applied to the casing structure. The simulation results revealed that the maximum von Mises stress increased from 7.517 × 10⁶ N/m² to 1.152 × 10⁷ N/m² as the load increased, while the maximum displacement rose from 1.050 × 10⁻¹ mm to 1.612 × 10⁻¹ mm. In contrast, the factor of safety decreased from 33.26 to 21.70, although all obtained values remained below the yield strength limit of ASTM A36 steel. The highest stress and strain concentrations were identified near the casing support and end sections, indicating critical regions requiring structural attention. Overall, the proposed casing design demonstrates satisfactory mechanical performance and structural safety for low-head micro-hydropower applications employing Archimedes screw turbines.
Effect of Indoor Temperature Setpoint on HVAC Energy Use and Thermal Comfort in Tropical Classrooms Hotdian Sinambela; Pramio Garson Sembiring; Haksa Fadilman Sinambela; Mei Derman Hulu; Wilbert Wu
DINAMIS Vol. 14 No. 1 (2026): Dinamis
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Heating, Ventilation, and Air-Conditioning (HVAC) systems contribute significantly to electricity consumption in tropical educational buildings due to continuous cooling demand. This study evaluates the influence of indoor temperature setpoints on cooling energy consumption and thermal comfort in two university classrooms equipped with split air-conditioning systems in Medan, Indonesia, using EnergyPlus simulations. Six temperature setpoints ranging from 20°C to 25°C were analyzed under identical operational and climatic conditions. Thermal comfort performance was assessed using the Predicted Mean Vote (PMV) method based on ASHRAE Standard 55. To verify the representativeness of the climatic input data, the outdoor dry-bulb temperature obtained from the EPW weather file was compared with observed outdoor temperature data collected on 30 May 2026, resulting in a relative error of 2.26%. The results show that increasing the setpoint temperature reduced annual cooling electricity consumption from 5,515 kWh to 3,607 kWh in Room J20.301 and from 5,284 kWh to 3,581 kWh in Room J20.302, corresponding to energy savings of 34.6% and 32.2%, respectively. However, thermal comfort performance decreased as the setpoint increased. At 25°C, PMV values reached 0.71 and 0.73, exceeding the ASHRAE comfort limit and reducing annual comfort compliance to below 1% in both rooms. The 23°C setpoint provided the most balanced performance, with annual energy consumption of 4,379 kWh and 4,292 kWh while maintaining PMV values within the acceptable comfort range at 0.35 and 0.32. Annual comfort compliance at this condition reached 87.6% and 96.1% for Rooms J20.301 and J20.302, respectively.

Page 26 of 26 | Total Record : 253

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