UMA - Open Access Journals (Universitas Medan Area)
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Hydrogen Production Simulation From Empty Palm Oil Bunches Using Aspen Plus
Get PDFA simulation model of biomass gasification for hydrogen production has been further developed using Aspen Plus. The model developed is based on Gibbs free energy minimization using the finite equilibrium method. The objective was to study the effect of important parameters such as gasification temperature, steam to biomass ratio and shift reaction temperature on hydrogen concentration. Simulations were conducted for palm empty bunch feedstock. The simulation results show that the main gas components in the synthetic gas are H₂, CO, CO₂, CH₄. Hydrogen gas increases with increasing temperature, hydrogen concentration increases from 22 kg/hour to 64 kg/hour but CH₄ concentration decreases from 50 kg/hour to 0 kg/hour with increasing temperature from 500-800˚C under 500 kg/hour steam flow rate operation
Design of an IoT-Based Control System for Energy Storage Efficiency and Monitoring
Get PDFThe increasing demand for efficient, transparent, and adaptive energy storage systems presents a significant challenge in supporting the global transition to renewable energy. This study presents the development of an Internet of Things (IoT)-based control system designed to optimize intelligent energy storage management. The system is built around an ESP32 microcontroller and integrates voltage, current, and temperature sensors, alongside wireless communication modules, all connected to a web-based dashboard for real-time monitoring. A dynamic control algorithm is employed to enhance the efficiency of the charging and discharging processes. Experimental results show a charging efficiency of 95% and a discharging efficiency of 94.74%, accompanied by a low data latency of 120 ms. The monitoring sensors demonstrate exceptional accuracy, with deviations within ±1% for voltage and current, and ±2°C for temperature, surpassing conventional systems. Compared to traditional approaches, the IoT-based system offers significant improvements in operational efficiency, data accuracy, and transparency in energy management. These findings highlight the potential of IoT integration in electronic control systems as an innovative solution for smart, efficient, and reliable energy storage. Future research should focus on scaling the system for industrial applications and incorporating artificial intelligence to predict performance and adapt system conditions in real-tim
Development of a Soybean Crushing Machine Based on the VDI 2221 Method at UKM Tempe Tiga Putra
Get PDFUKM Tempe Tiga Putra, located in Jepara, faces challenges in the manual soybean crushing process. This process takes approximately 2 hours and 30 minutes per day to handle a daily capacity of 65 kg and imposes significant physical strain on workers, especially on the wrists. This study aims to design a more efficient and ergonomic soybean crusher using the VDI 2221 method. The resulting machine features specifications such as a ¼ hp AC motor, a hollow galvanized frame, an A-type V-belt, and dimensions tailored to the operator's anthropometry. The machine reduces processing time to 24 minutes per day, improving efficiency by 83.97%. The VDI 2221 method facilitated a design that meets the technical and economic requirements of the UKM while enhancing operator comfort. This innovation not only boosts production efficiency but also minimizes the risk of injury from manual labor. Consequently, the tool significantly enhances productivity and fosters a better working environment at UKM Tempe Tiga Putra
Penerapan Arsitektur Tropis pada Rumah Susun di Kecamatan Tanjung Morawa
Get PDFNorth Sumatra, whose capital city is Medan, is in the 4th position as the most populous province in Indonesia, which of course will continue to increase over time due to population urbanization activities. Meanwhile, Medan City has increasingly scarce land for development, therefore the government is implementing a development strategy in the Medan City area which has a hierarchy related to the development of Medan City and Population. One of the districts that is related to Medan City is Deli Serdang Regency. Of the several sub-districts in Deli Serdang Regency, Tanjung Morawa Sub-district and its surroundings are the sub-districts that are highly prioritized for development. This design is in line with the one million houses for the people program which is the national residential development agenda listed in the attachment to Presidential Decree No.2 of 2015 concerning the national medium term development plan (RPMJ). Tropical architecture is very suitable for this development because it is considered to provide a positive reaction to weather and climate and can provide comfort to building users
Menyelami Potensi Kecerdasan Buatan: Perspektif Mahasiswa Arsitektur dalam Membangun Masa Depan Desain
Get PDFArtificial intelligence has evolved from being a design tool to a system capable of performing design analysis, generating architectural concepts. This study aims to explore students' views on AI that can complement their creativity and contextual sensitivity. Using a survey approach with a descriptive quantitative design, it explores students' perspectives on Artificial Intelligence. The findings show that although AI has significant potential to improve efficiency in the architectural profession, aspects such as creativity, empathy, and cultural sensitivity remain beyond the reach of technology
Evaluasi Fungsi Pedestrian di Kesawan dalam Mendukung Kawasan Heritage Kota Medan
Get PDFHistoric areas play an important role in the cultural and architectural identity of a region. In a historic area, the local government, in this case BPK2LK, conserves historical relics not only in the old building rows, but also in the surrounding area. This aims to provide an area identity to revive and improve the area's economy. In the Kesawan area which is one of the historical areas, the implementation of revitalization of the area by widening the pedestrian area. This is to provide comfort and activate the pedestrian function as a support for the historic tourism area in Kesawan. But an evaluation study is needed on the effectiveness of the function of the pedestrian path, on the basis of observations there are several congestion problems due to smaller vehicle lanes and the quantity of vehicles that increase every day. Another problem is that there is no bus stop, so public transportation uses the road to lower and raise passengers. Pedestrians who are already larger and more comfortable, have not increased the quantity of pedestrians. The purpose of this study was to assess the effectiveness of the success of the pedestrian function in the Kesawan area after the pedestrian area underwent reconstruction. Research methods carried out with qualitative and quantitative approaches through field surveys, interviews, questionnaires, statistical data processing. The analysis was carried out using SWOT analysis to get a comprehensive picture of the strengths, weaknesses, opportunities, and threats in the function of pedestrian paths in historic areas. The research output shows the success of changes to road widening in the pedestrian area in Kesawan which shows 85% stated that pedestrians in the area feel comfortable with the presence of street furniture. This facility allows pedestrian users to enjoy the historic area in the area. However, there are still some shortcomings such as poor facilities such as the lack of trash bins that make this area less clean. Nevertheless, this widening area can be recommended to the community to maximize the use of pedestrians
Penerapan Arsitektur Hijau pada Bangunan Politeknik Teknologi Kimia Industri Medan
Get PDFGreen architecture, also known as sustainable architecture, is a concept in architecture that has characteristics and focuses on environmentally friendly architecture. The important points of green architecture include minimising the consumption of natural resources, energy efficiency, wise and sustainable use of water, and non-polluting and recyclable materials. In educational buildings, the concept of green architecture is very important to use, not only to reduce emissions and global warming, but also because green architecture significantly influences the performance or comfort of people inside when learning. The purpose of this study is to understand how the concept of green architecture is applied in the buildings of the Polytechnic of Chemical Industry Technology (PTKI) campus in Medan. This study employs a qualitative descriptive method, which involves describing or explaining existing conditions in the field through analysis and extensive discussion to identify results and conclusions. The application of green architecture in buildings is assessed using the Green Building Council Indonesia (GBCI) green architecture indicators. The findings of this study indicate that the PTKI campus meets three main GBCI green architecture indicators: appropriate land use, material sources and cycles, and air quality and comfort
Analisis Faktor-Faktor yang Mempengaruhi Hasil Tangkapan Nelayan Payang di Kelurahan Pasie Nan Tigo Kecamatan Koto Tangah Kota Padang: Analysis of Factors Affecting the Catches of Payang Fishermen in Pasie Nan Tigo Village, Koto Tangah District, Padang City
Get PDFPayang is one of the fishing gears used by fishermen in Pasie Nan Tigo Village. The utilization of production factors contributes to an increase in the catch of payang fishermen. This study aims to identify the factors influencing the catch of payang fishermen and to determine the scale of their business operations in Pasie Nan Tigo Village. The research employed a survey method with a quantitative descriptive approach. Data were analyzed using multiple linear regression, supported by classical assumption tests and the Cobb-Douglas production function. The results indicate that the production factors significantly influencing the catch of payang fishermen are the duration of fishing trips (X2), the number of settings (net deployments) (X3), and the number of crew members (X4). Meanwhile, the length of the net bag (X1) and the fishermen's work experience (X5) were found to have no significant effect on the catch. The coefficient of determination shows that 75.4% of the variation in catch is explained by the model, while the remaining 24.6% is influenced by other factors not included in the model. The Return to Scale (RTS) value of 1.072 indicates an increasing return to scale, meaning that an increase in input results in a more than proportional increase in output
ANALYSIS OF SOIL MACROFAUNA DIVERSITY IN DRAGON FRUIT AREA AT AL-ASRI FRUIT GARDEN APPLIED WITH PALM OIL MILL EFFLUENT
Get PDFThe presence and diversity of soil macrofauna in dragon fruit areas that are not applied with Palm Oil Mill Effluent (POME) and those applied with POME as fertilizer, with variations in application time, can reflect different soil qualities. This study aims to analyze species presence, Diversity Index (H') soil macrofauna, and its correlationwith application POME in dragon fruit areas without application (Block I) and those applied with POME (Pond 5) PT. Anugrah Tanjung Medan, with variations in waste application time 14 days (Block II) and 28 days (Block III). The research used Purposive Sampling method, and soil macrofauna sampling with Quadrat and Hand Sorting methods. The results of the study revealed 52 species of soil macrofauna, with 28 species Block I, 40 species Block II, and 37 species Block III. The highest H' value for soil macrofauna was found in Block II (3.08), categorized as high diversity, followed by Block III (2.87) and Block I (2.72), which were categorized as moderate diversity. These results indicate that utilization of POME as fertilizer for 14 days (Block II) has a positive correlation with increase in the presence and diversity of soil macrofauna, contributing to improved soil quality
Analisis Tegangan, Regangan dan Pertambahan Panjang Profil C Baja Ringan
Get PDFDengan kemajuan masyarakat kontemporer, khususnya konstruksi, telah terjadi evolusi yang signifikan dan cepat. Cold formed steel, umumnya disebut sebagai baja ringan, merupakan salah satu bahan yang sedang berkembang di pasar konstruksi yang diproduksi melalui pendekatan manufaktur sistematis. Tujuan penelitian untuk memastikan kualitas bahan baja ringan di Yogyakarta sejalan dengan spesifikasi yang disyaratkan untuk aplikasi struktural, terkhusus G550. Metode penelitian yang digunakan merupakan eksperimen uji tarik menggunakan Automax Universa Testing Machine. Hasil penelitian diperoleh rata-rata tegangan maksimum diperoleh sampel S memiliki kuat tarik maksimum rata-rata 864,76 MPa lebih besar dibandingkan sampel C dan M dengan masing-masing kuat tarik maksimum rata-rata sebesar 831,92 Mpa dan 818,15 Mpa. Sedangkan, rata-rata regangan masing-masing sampel C, S, dan M adalah 1,51, 1,50, dan 1,52. Sampel M memiliki regangan lebih besar dibandingkan sampel C dan S. Pada pertambahan panjang total tegangan leleh sampel C memiliki pertambahan total 0,1427 mm lebih besar dibandingkan kedua sampel S dan M dengan masing-masing petambahan total tegangan leleh sebesar 0,1327 mm dan 0,1387 mm. Sedangkan, untuk pertambahan panjang total tegangan maksimum menunjukkan bahwa sampel S lebih unggul dibandingkan kedua sampel lainnya dengan nilai sebesar 3,3021 mm, sedangkan C dan M masing-masing memilki nilai sebesar 3,0549 mm dan 3,1075.With the advancement of contemporary society, especially in construction, there has been a significant and rapid evolution. Cold-formed steel, commonly referred to as light steel, is one of the materials that is currently developing in the construction market, produced through a systematic manufacturing approach. The purpose of this research is to ensure the quality of lightweight steel materials in Yogyakarta meets the specifications required for structural applications, specifically G550. The research method used is a tensile test experiment using the Automax Universat Testing Machine. The research results show that the average maximum stress of sample S has a maximum tensile strength of 864.76 MPa, which is greater than that of samples C and M, with average maximum tensile strength of 831.92 MPa and 818.15 Mpa, respectively. Meanwhile, the average strain for sampels C, S, and M are 1.51, 1.50, and 1.52, respectively. Sample M has a greater strain compared to samples C and S. in terms of total elongation at the yield point, sample C has a total elongation of 0.1427 mm, whichis greater than that of samples S and M, with total elongations of 0.1327 mm and 0.1387 mm, respectively. For total elongation at maximum stress, sample S outperforms the other two samples with a value of 3.3021 mm, while C and M have values of 3.0549 mm and 3.1075 mm, respectively