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EPI International Journal of Engineering
Published by Universitas Hasanuddin
ISSN : 26155109     EISSN : 26210541     DOI : https://doi.org/10.25042/epi-ije
Core Subject : Science, Engineering,
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering
EPI International Journal of Engineering (EPI-IJE) is published and managed by Center of Technology, Faculty of Engineering, University of Hasanuddin (CoT, FoE, UNHAS), Indonesia. The main objective of this international journal is to create publishing opportunities and to disseminate knowledge in engineering-related topics collected from all over the world. A wide range of topics may be accepted, including from both conventional engineering and newly developed fields. Multi-disciplinary and Inter-disciplinary fields are encouraged to submit, and the topic on engineering education is also welcome. Manuscripts should be in English only. This journal system is open free-access to public in electric form, and the paper-form journal is also available. No fee is charged to accepted papers. On acceptance of submitted paper, authors are asked to submit a short copy-right form, but the authors have rights to reuse their work. The submitted manuscripts are under peer review at least by two reviewers, and publication is made biannually.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 168 Documents
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The Assessment of Indoor Thermal Comfort Of University Classrooms in Hot and Humid Area Andarini, Rahmi; Al-Haidar, Muhammad Dzaky; Lee, Vincentius Rayza
EPI International Journal of Engineering Vol 8 No 1 (2025): Volume 8 Number 1, Februari 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

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Abstract

Thermal comfort is a description of the mental satisfaction experienced by humans regarding the temperature conditions in the surrounding environment. Appropriate thermal comfort conditions will have a positive influence on the occupant such as increasing productivity. This research was carried out to determine the level of thermal comfort in classrooms of the Universitas Multimedia Nusantara. There are two methods applied in this study, firstly by measuring indoor air quality parameters, and the second method is by surveying the occupants' acceptance of the indoor air condition. The measurement of indoor air parameters consists of two different methods, those are by installing Internet of Things monitoring systems, and manual measurement. There were 2 classrooms and 1 student lounge surveyed, and the measured parameters were indoor air temperature and relative humidity. The results of the measurements show that the average indoor air temperature of the conditioned classrooms was 26OC and the average temperature of the student lounge during unconditioned was 29OC. With the same condition, the measured relative humidity in the classrooms was found at 55% and the student lounge was at 70%. Regarding the thermal comfort condition, 68% of occupants of Student Lounge felt just comfortable,17% felt very comfortable and 15% felt uncomfortable. The opinion regarding this choice is affected by the sitting position of the respondents. At the classrooms D1509 and D1510, 64% of the respondents felt just comfortable, 28% felt very comfortable, 8% felt uncomfortable, which means that the majority of the respondents felt comfortable.
Slope Stability Analysis of Pit X on Nickel Mining Based on Comparison between Design and Actual Mining Condition Purwanto, Purwanto; Abadi, Tegar
EPI International Journal of Engineering Vol 7 No 2 (2024): Volume 7 Number 2, August 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082024.02

Abstract

The nickel laterite mining on the slopes of pit X uses the open-cast mining method with material strength conditions similar to soil. Slope stability considerations under temporary conditions such as earthquakes and increased groundwater levels due to rain need to be reviewed as a precaution against landslides. Limonite and saprolite materials have varying cohesion and phi values that affect the safety factor value. The probability function describes the distribution of a random variable to estimate the probability value of a parameter. The limit equilibrium method can indicate the probability of failure. The pit X slope is designed with a bench height of 10 meters, a bench width of 7 meters, and a single slope inclination of 45˚, but after mining, the slope geometry and material distribution conditions change. Stability analysis of the pit X by comparing design and actual conditions after mining is conducted to determine the safety factor comparison under various soil conditions in both design and actual states. The analysis is performed using the Unified Soil Classification System (USCS) classification method and the Morgenstern-Price (MP) limit equilibrium method. All sections meet the slope stability criteria based on the minimum safety factor standards of 1.30 for static conditions, 1.10 for dynamic conditions, 1.0 for saturated soil conditions, and a probability of failure of <5%. However, based on the results of physical property tests, slope stability needs to be reviewed periodically due to the potential for landslides. Sections A-A' and D-D' have steeper overall slopes in the actual condition, resulting in lower safety factors than in the design condition. Sections B-B' and C-C' have gentler overall slopes in the actual condition, resulting in higher safety factors than in the design condition.
Analysis of the Performance of a Solar Water Heating System Utilizing a Flat-Plate Absorber with Integrated Thermal Storage Anis IR, Muhammad; Haddada, Jalaluddin; Mochtar, A. Amijoyo
EPI International Journal of Engineering Vol 7 No 2 (2024): Volume 7 Number 2, August 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082024.06

Abstract

Solar water heaters (SWHs) are widely used all over the world since they use solar energy to power themselves. Solar water heaters that use aluminum-alumina (AL2O3) thermal storage at the collector base are the focus of this experimental evaluation. To maximize the efficiency of the heat transfer process and the water heating system, it is essential to incorporate thermal storage within the collector. An investigation of the efficiency of a solar water heater with AL2O3 thermal storage has been conducted. Tests are conducted on two different types of absorber plates: the standard flat-plate (SFP) collector and the SFP with AL2O3 as thermal storage. The tests are carried out over the course of a period of 180 minutes and under conditions of constant solar intensity. When the SFP and SFP-TS models are compared, the results indicate that the SFP-TS type has a greater outlet temperature than the traditional SFP. The SFP-TS model delivers a thermal efficiency boost of around 6% when compared to the SFP model with the same specifications. Adding AL2O3 to the absorber plate as a thermal storage material improves the thermal efficiency of the plate collector, increases the duration that heat is stored in the collector, and improves the absorption of radiant heat energy. Keywords: Solar Water Heater (SWH), Aluminum-alumina (AL2O3), Standard Flat Plate (SFP), Standard Flat Plate with Thermal Storage (SFP-TS)
Performance and Capabilities of Small Qualification Contractors on the Sustainable Construction Regulations Implementation Choir, Mochamad; Sebayang, Nusa; Wijayaningtyas, Maranatha; Wiharti, Wiwik
EPI International Journal of Engineering Vol 7 No 2 (2024): Volume 7 Number 2, August 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082024.05

Abstract

The construction sector is important in Indonesia's economic and social development. With the increasing awareness of the importance of sustainability, implementing sustainable construction principles has become necessary. On the other hand, construction service businesses with small qualifications face various challenges in meeting strict regulations and adapting to sustainable practices. This study aims to analyse the performance and capabilities of sustainable construction services businesses in small qualification contractors in East Java on implementing sustainable construction services business regulations. The research method used is mixed methods, as well as qualitative and quantitative methods. As many as 100 respondents are members of the Gapeksindo East Java association with small qualifications. The results showed that construction service businesses with good management (high managerial ability) tend to be more able to comply with sustainable construction regulations. In addition, the descriptive analysis results show recommendations and strategies to improve the implementation of construction services regulations among small businesses, such as training and education, financial support, Simplification of Regulations, technology and innovation, Increased Market Awareness, and technical assistance. With these strategies, it is expected that small construction service businesses in East Java can be more effective in implementing sustainable construction regulations to improve their performance and contribution to sustainable development.
Bearing Capacity and Deformation of Timber Pile-Raft Foundation on Soft Soil Deposits Yunus, Muhammad; Firman, Risman
EPI International Journal of Engineering Vol 7 No 2 (2024): Volume 7 Number 2, August 2024
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25042/epi-ije.082024.04

Abstract

A pile-raft foundation is a type of foundation that combines two different types of foundations, a raft base and a pile foundation. These raft bases are one of the most practical economic solutions for buildings because both the support capacity of the raft and the support capability of the pile both work. The paper presents results of the test bearing capacity of piled-raft foundations made from timber in the laboratory and analyzes numerically the deformations that occur in piled raft foundations made of timber. The results of the loading test on the Bakau piled raft foundations in the laboratory obtained the maximum load that can be held by the foundation before experiencing a failure of 85.00 kN with a deformation value of 21.50 mm. Whereas from the load vs. deformation curve, the ultimate bearing capacity is obtained by the Bakau piled raft foundations at 59.00 kN with an ultimate settlement of 6.00 mm. From the results of the validation between the loading test results of the foundation model in the laboratory and the results of numerical analysis, which compared the results of laboratory tests and the results of plaque analysis, the soil with reinforcement of Timber piled raft foundations gave results that were not much different.
Computational Fluid Dynamic Analysis on Double-Type Drying Machine Design -, Waleed; Moulia, Mona Nur; Azadi, Athoillah
EPI International Journal of Engineering Vol 8 No 1 (2025): Volume 8 Number 1, Februari 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

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Abstract

The design of a double-type dryer with tray and rotary will be designed to be able to dry chips and grains commodities in one time process for energy and time-saving. In the designing process, Computational Fluid Dynamic (CFD) simulation is used to analyze the distribution of hot air and minimize failures in the design. The purpose of this study was to determine the pattern of hot air flow distribution and determine the best design of the drying machine. The parameters used in the CFD input have a temperature of 60 oC, air velocity 1 m/s, and a pressure 1.01325 bar with a constant time. This study used 2 treatments, namely the outlet position parameter (A) with dimension 60 mm x 60 mm and the number of holes in the bulkhead between the tray and rotary have the gap type (L) with dimension 540 mm x 70 mm with a total of 21 treatments. This research begins with pre-processing for made geometry and boundary condition input, next is solver process with average iterations 298 with 36 s interval, and the last is post-processing for having air contour. The results showed that the best treatment based on temperature pattern is the A2L1L2 treatment, with the output A2 and 2 limiting gaps, on gaps 1 and 2. This treatment had an average temperature distribution of 56.69 oC, deviation 3,55 oC, air velocity 1.57 m/s, and turbulence 0.021 m/s.
Evaluation of Articulated CAT 745 Fuel Ratio Based on Haul Road Geometry at PT Hillconjaya Sakti Site PT Adhi Kartiko Pratama Tbk Anas, Aryanti Virtanti; S, Wahyuni; Sutardjo Tui, Rini Novrianti; Amalia, Rizki
EPI International Journal of Engineering Vol 8 No 1 (2025): Volume 8 Number 1, Februari 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

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Abstract

The distance for transporting overburden at PT Hillconjaya Sakti reaches hundreds of meters. Based on actual conditions, Articulated CAT 745 queues often occur on certain haul road segments due to unsuitable haul road conditions so the fuel ratio value is in the low performance category. The purpose of this study is to evaluate the fuel ratio value and provide recommendations for improving the geometry of haul roads to meet the established fuel ratio value standards. Multiple linear regression analysis using Eviews 12 VS was used to determine the variables that significantly affect the fuel consumption of hauler based on haul road geometry. Road grade, total resistance, travel time and speed of the hauler are independent variables, while fuel consumption is the dependent variable. Based on the results of data processing, a fuel ratio value of 1.85 was obtained and the parameters that had a significant effect on fuel consumption were total resistance and travel time. Improvement of haul road conditions based on ESDM Decree No. 1827 K/30/MEM/2018 and AASHTO Manual Rural High Way Design. The fuel ratio value after repairs decreased to 0.60 and was in the best performance category based on PT Hillconjaya Sakti's standard fuel ratio value.
Preliminary Design and Energy Production of a Mobile Floating Structure (MFS) for Offshore Wind Turbines in Indonesian Waters Pawara, Muhammad Uswah; Sitorus, Chris Jeremy Verian; Hariyono, Hariyono; Arifuddin, Andi Mursid Nugraha; Alamsyah, Alamsyah; Hidayat, Taufik; Suardi, Suardi; Syadzali, Abdul Mujib; Mahmuddin, Faisal
EPI International Journal of Engineering Vol 8 No 1 (2025): Volume 8 Number 1, Februari 2025
Publisher : Center of Techonolgy (COT), Engineering Faculty, Hasanuddin University

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Abstract

The Mobile Floating Structure (MFS) is an innovative floating wind turbine concept that utilizes a catamaran hull design to enhance mobility and operational efficiency. Unlike stationary platforms, the MFS can relocate to areas with higher wind energy density, making it a promising solution for optimizing wind energy harvesting in offshore environments. This study focuses on the preliminary design and energy production of the MFS. Maxsurf is used to analyze hydrostatics and assess the hydrodynamic performance of the MFS hull after the dimension of the MFS is determine with key considerations including rotor diameter and the weight of the wind turbine. Furthermore, four wind turbines are installed in the MFS. Those aspect were integrated into the design process to ensure realistic operational adaptability. As result. the resulting dimensions of the MFS were determined utilizing Maxsurf. Moreover, different with the previous study that use satellite data, the present study employs reanalysis data to estimate the energy density and power production of MFS. the energy density map is also produced in the present study to determine the monthly location of the MFS. The energy production of the MFS with four turbines has been calculated, and the energy production map is also drawn. Finally, the energy production of the MFS in the chosen location has also been estimated. The energy production map can be utilized to develop MFS in other location.

Page 17 of 17 | Total Record : 168

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