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Nozel : Jurnal Pendididikan Teknik Mesin
Published by Universitas Sebelas Maret
ISSN : -     EISSN : 2656713X     DOI : https://doi.org/10.20961/nozel
Core Subject :
NOZEL : Jurnal Pendidikan Teknik Mesin is a national forum for the publication and dissemination of original work which contributes to greater scientific understanding of the main disciplines underpinning the mechanical engineering and vocational education. This international journal is dedicated to the latest advancements in mechanical engineering and vocational education. The goal of this journal is to provide a platform for scientists and academicians all over the world to promote, share, and discuss various new issues and developments in different areas of mechanical engineering and vocational education. This journal is published in the online journal, which publishes research articles, reviews, and letters in all areas of mechanical engineering and vocational education. It is a blind peer-reviewed journal, aims to provide the most complete and reliable source of information on current developments in the field. The emphasis will be on publishing quality papers rapidly and available to researchers worldwide.
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Articles 158 Documents
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Analisis Kinerja Buck Boost Converter LTC3780 Pada Sistem Micro Combustion Untuk Pengisian Baterai Lithium Hidayatullah, Arrafi Nur; Saputro, Herman
Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 4 (2025)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v7i4.105162

Abstract

The use of electronic devices or equipment is inseparable from daily life, which contributes to the increasing demand for electrical energy. The growing electricity consumption in Indonesia encourages many people with various creative ideas to develop tools or generate electricity independently by utilizing existing energy sources. One solution for supplying electrical energy is micro-scale power generation (micropower generation). In this context, the converter module used is a Thermo Electric Generator (TEG). TEG can generate electrical voltage proportional to the temperature difference between the hot and cold sides. The heat source is obtained from the combustor, while the cooling temperature is provided by a cooling system. One of the solutions to stabilize the electrical energy produced by the TEG is to use a buck-boost converter. This research aims to analyze the performance of the LTC3780 buck-boost converter concerning the electrical energy produced by the micropower generation system for battery charging and to determine the efficiency of the LTC3780 buck-boost converter for lithium battery charging with various cell configurations. This research employs a quantitative descriptive data analysis technique combined with a comparative approach. The results of this study indicate that the use of the LTC3780 affects the voltage stability during battery charging, and the number of battery cells also influences the output voltage of the LTC3780. The 3-cell configuration provides the highest and most consistent output voltage throughout the testing period. Furthermore, battery charging efficiency tends to be more optimal with fewer battery cells, particularly in the 1-cell and 2-cell configurations. Conversely, the greater the number of cells used, the lower the charging efficiency tends to be.
Analisis Pengaruh Kedalaman Insulasi Riser Terhadap Kinerja Termal dan Tekno - Ekonomi Sistem Geothermal Closed-Loop Berbasis Co2 Atho'illah, Muhammad Robith; Pambudi, Nugroho Agung
Nozel : Jurnal Pendididikan Teknik Mesin Vol 8, No 1 (2026)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v8i1.118682

Abstract

AbstractThe closed-loop geothermal system (CLGS) utilizing supercritical carbon dioxide (sCO2) is a promising technology, yet its thermal efficiency is significantly affected by heat loss as the fluid flows upward to the surface through the production pipe (riser). The application of Vacuum Insulated Tubing (VIT) on the riser is proven effective in suppressing thermal losses, but it presents a financial trade-off due to high capital expenditure (CAPEX). This study aims to analyze the effect of riser insulation depth variations on the thermal performance of sCO2 wells and the power generation performance of an Organic Rankine Cycle (ORC) utilizing R245fa working fluid, as well as to evaluate its techno-economic aspects to determine the optimal insulation depth that yields the lowest Levelized Cost of Electricity (LCOE). The method used in this research is numerical modeling and simulation of a U-shaped geothermal system configuration. Variations were applied to the insulation depth ranging from 0 meters (uninsulated) to the maximum well depth, evaluating changes in parameters such as outlet temperature, heat extraction rate, natural thermosiphon effect, ORC net power output, and economic feasibility indicators. The results show that increasing insulation depth has a significant impact on the system's thermal performance. Increasing the insulation depth from 0 m to the optimum point of 2,750 m increased the fluid production temperature from 111.27 °C to 127.13 °C and raised the heat extraction rate from 1.949 MW to 2.472 MW. This improvement in thermal quality directly impacted the increase in ORC net electric power by 26.83%, from 0.2339 MW to 0.2966 MW. From a techno-economic perspective, the insulation depth of 2,750 m was determined as the financial sweet spot, generating a minimum LCOE of 0.96991 USD/kWh, which is a 13.51% decrease compared to the uninsulated system. In conclusion, determining the precise insulation depth is highly crucial in maximizing thermodynamic performance while maintaining the financial feasibility limits of the CLGS power plant infrastructure
Persepsi Pihak Industri Terhadap Kompetensi Mahasiswa PTM pada Program Magang Industri Sari, Risa Tri Komala; Estriyanto, Yuyun
Nozel : Jurnal Pendididikan Teknik Mesin Vol 6, No 4 (2024)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v6i4.90595

Abstract

The purpose of this study was to determine the assessment of the industry, especially field supervisors regarding the competence of students who participated in the industrial internship program majoring in Mechanical Engineering Education FKIP UNS with a concentration in Production for the 2022 period. This study uses a descriptive method, which aims to collect, analyze, and present data that has a relationship with the problem under study. Data collection techniques using questionnaires and interviews. The results showed that the industry's perception of the competence of PTM students was in the very good category and was considered quite in accordance with industry needs, with work attitude as the most prominent aspect (82.5%). However, there is still room for improvement, especially in the aspects of practical skills (74.2%) and knowledge application (76.5%) in order to produce graduates who are better prepared to face the demands of the dynamic world of work. With good assessments, especially in the work attitude aspect, PTM graduates have good competitiveness potential in the job market, but need to continue to improve their practical skills and knowledge application abilities to maximize employment opportunities. Conducting Conduct an in-depth analysis of the gap between the competencies expected by industry and those possessed by students so that it can be the basis for recommendations for curriculum improvements that are more specific to the demands of the labor market and improve the work readiness of PTM graduates.
Analisis Kinerja Sistem Pengisian Baterai Lithium-Ion Menggunakan Buck Converter LM2596 Pada Micropower Generation Berbasis Thermoelectric Muayad, Muhamad Khizam; Saputro, Herman
Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 3 (2025)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v7i3.105135

Abstract

Penelitian ini menggunakan metode penelitian eksperimen. Percobaan ini menggunakan baterai lithium-ion. Pengujian dilakukan sebanyak 3 kali dengan waktu 25 menit dengan interval pengambilan data setiap 5 menit. Pengujian dilakukan dengan pembakaran dalam double meso vortex combustor. Kemudian nyala api distabilkan dengan mass flow meter. Suhu sisi panas dan sisi dingin TEG diukur menggunakan termokopel untuk menghasilkan perbedaan suhu (∆T) antara kedua sisi, output yang dihasilkan berupa tegangan (Volt) dan arus (Ampere), kemudian dihubungkan dengan rangkaian sistem pengisian baterai. Pengukuran dilakukan dengan mengukur output TEG, output buck converter, dan tegangan serta arus input pada baterai menggunakan multimeter. Variasi 1 sel baterai memiliki efisiensi total terbaik dibandingkan dengan konsentrasi lainnya dengan nilai rata-rata sebesar 41%, sedangkan untuk efisiensi buck converter tertinggi sebesar 47%. Hal ini menunjukkan bahwa jumlah sel baterai mempengaruhi efisiensi kinerja sistem pengisian baterai menggunakan buck converter LM2596 pada Pembangkit Listrik Tenaga Mikro. 
Dampak Pembelajaran Project Based Learning Terhadap Sikap Disiplin dan Hasil Belajar Unjuk Kerja Mata Pelajaran Teknik Pemesinan Bubut Maulana, Faadiihilah Daffa; Shidqi, Muhammad Ilhamus; Faii, Muhamad Zahril; Suwarta, Suwarta; Wijayanto, Danar Susilo
Nozel : Jurnal Pendididikan Teknik Mesin Vol 8, No 1 (2026)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v8i1.107041

Abstract

Mata kuliah Praktik Pemesinan teknik bubut di Sekolah Menengah Kejuruan (SMK) bertujuan untuk membekali siswa dengan keterampilan teknis dan sikap kerja profesional. Namun, hasil observasi di Kelas XI Fase F SMKS Pancasila Surakarta menunjukkan masih rendahnya kedisiplinan siswa saat praktik, seperti penggunaan alat keselamatan kerja yang kurang tepat dan ketidakpatuhan terhadap prosedur. Selain itu, capaian kinerja siswa juga masih rendah, hanya 23,08% siswa yang melampaui Kriteria Kompetensi Minimal (KKM). Penelitian ini bertujuan untuk meningkatkan kedisiplinan dan capaian kinerja siswa melalui penerapan model Project Based Learning (PjBL). Metode yang digunakan adalah Penelitian Tindakan Kelas, dilaksanakan selama tiga siklus dengan melibatkan 13 siswa sebagai subjek. Pengumpulan data dilakukan melalui observasi untuk menilai kedisiplinan dan penilaian kinerja menggunakan lembar kerja untuk menilai capaian pembelajaran. Hasil penelitian menunjukkan adanya peningkatan yang signifikan. Pada siklus I, hanya 30,77% siswa yang menunjukkan kedisiplinan baik, dan 23,08% memenuhi kriteria pembelajaran. Pada siklus kedua, kedisiplinan meningkat menjadi 53,85%, dan penguasaan pembelajaran meningkat menjadi 46,15%. Pada siklus ketiga, seluruh siswa (100%) menunjukkan kedisiplinan yang sangat baik, dan semuanya mencapai penguasaan pembelajaran dengan skor rata-rata 85,38. Kesimpulannya, penerapan model PjBL terbukti efektif dalam meningkatkan kedisiplinan dan hasil kinerja siswa dalam mata kuliah praktik pemesinan bubut, karena model ini mendorong keterlibatan aktif, tanggung jawab, dan kolaborasi selama proses pembelajaran.
Internalisasi Nilai Sense Of Efficiency dalam Pembentukan Budaya Industri di SMK Mikael Surakarta Mahardika, Mikael Dimas; Sutrisno, Valiant Lukad Perdana
Nozel : Jurnal Pendididikan Teknik Mesin Vol 8, No 3 (2026)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v8i3.119667

Abstract

Vocational education plays an important role in preparing human resources who are not only technically competent but also possess work characteristics aligned with industrial culture. One important industrial value that needs to be internalized is Sense of Efficiency, which emphasizes effective and optimal utilization of time, energy, tools, and materials without compromising work quality. This study aims to analyze the internalization process of the Sense of Efficiency value in shaping industrial culture at SMK Mikael Surakarta. This study employed a qualitative case study approach involving school management, workshop coordinators, practical teachers, and twelfth-grade students selected through purposive and snowball sampling techniques. Data were collected through semi-structured interviews and analyzed using the interactive model of Miles and Huberman, while data validity was ensured through source triangulation. The findings indicate that the internalization of Sense of Efficiency is implemented gradually through time discipline, work preparation, optimization of tools and materials, and time-based work evaluation. The process is strengthened through a block learning system, industrial-based practical environments, and teachers’ active roles in guiding students toward effective work habits. This study concludes that the cultivation of efficiency values in vocational education contributes to strengthening students’ work readiness in responding to industrial productivity demands.
UPAYA PENINGKATAN PRESTASI BELAJAR MAHASISWA PADA PERKULIAHAN MOTOR BAKAR MAHASISWA PRODI PTM FKIP UNS MELALUI PENERAPAN MODEL PEMBELAJARAN PROBLEM BASED LEARNING (PBL) Bawono, Lanang Pandi; Ranto, Ranto
Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 2 (2025)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v7i2.98720

Abstract

This study aims to investigate the application of the Problem Based Learning (PBL) model in improving student learning achievement in the Internal Combustion Engine course for second-semester students of the Mechanical Engineering Education Program, Faculty of Teacher Training and Education, Sebelas Maret University Surakarta, in the 2022 academic year. This research is a classroom action research (CAR) conducted over three cycles, with each cycle consisting of (1) Planning, (2) Implementation, (3) Observation, and (4) Reflection, focusing on actions to improve student learning achievement in the Internal Combustion Engine course. Data collection was carried out using observation methods. The research subjects were students of the Internal Combustion Engine Course, Class A, second semester, of the Mechanical Engineering Education Program, batch 2022, with a total of 42 students. The analysis used in this study is descriptive qualitative analysis. Based on the research results, the application of the Problem Based Learning (PBL) model resulted in an improvement in student learning achievement. The study showed that the students' learning outcomes in the Internal Combustion Engine course in Class A, PTM FKIP UNS, were initially low. The data obtained showed that the percentage of all indicators in the pre-cycle was 69.52%, in the first cycle 96.67%, in the second cycle 72.02%, and in the third cycle 76%. The conclusions drawn from the analysis and discussion of the research are as follows: The application of the Problem Based Learning (PBL) model can improve student learning achievement in the Internal Combustion Engine course in the PTM FKIP UNS, second semester of the 2023 academic year.
Implementasi Kelas Industri pada Program Keahlian Teknik Kendaraan Ringan Otomotif di SMK Ganesha Tama Boyolali Diningrat, Tomi Leo Putra; Sutrisno, Valiant Lukad Perdana
Nozel : Jurnal Pendididikan Teknik Mesin Vol 8, No 3 (2026)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v8i3.119265

Abstract

Industrial class programs in Vocational High Schools (SMK) are an educational innovation aimed at bridging the gap between the world of education and the requirements of the industry. This study aims to analyze the implementation process of the industrial class program within the Automotive Light Vehicle Engineering Department at SMK Ganesha Tama Boyolali. A qualitative approach with a case study design was employed. Data were collected through in-depth interviews, observations, and documentation analysis. The data analysis followed the Miles and Huberman model, encompassing data reduction, data display, and conclusion drawing. The findings reveal that the implementation involves five strategic stages: (1) initiating partnership through a Memorandum of Understanding (MoU) with PT Komatsu, (2) adaptive curriculum synchronization to integrate industrial standards, (3) selective student recruitment involving physical and psychological assessments, (4) Teaching Factory (TEFA)-based learning with additional practical hours and the internalization of the 5R/5S work culture, and (5) rigorous discipline monitoring and evaluation. The study concludes that while the program successfully integrates industrial standards into the school environment, the synchronization process remains largely one-way, with the school predominantly adapting to the industry partner's standards.
Penerapan Model Pembelajaran Teaching Factory (TEFA) pada Materi Konsep Dasar Kelistrikan Sepeda Motor Terhadap Hasil Belajar Siswa Kelas XI TBSM SMK Negeri 1 Nisam abidin, zainal; Siraj, Siraj; Fatwa, Islami; Bakar, Abu; Muliana, Muliana
Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 1 (2025)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v7i1.95439

Abstract

This research aims to find out: (1) Improvement in student learning outcomes, (2) Student responses, (3) Find out whether there is an increase in student and teacher activity, after implementing the taching factory learning model on basic electrical concepts material in class XI TBSM SMK Negeri 1 Nisam. The type of research used is Quasi Experimental Design using a nonequivalent control design. The sampling technique used was 40 students consisting of 20 class XI TBSM 2 students as the experimental class and 20 TBSM 1 students as the control class. Data collection instruments use multiple choice questions and questionnaires. The research results show that: (1) There is an increase in student learning outcomes after implementing the teaching factory learning model on basic motorbike electrical concept material with an average n-gain score for the experimental class of 0.70, which is in the medium category, in the control class the average is n -gain score of 0.16 is in the low category. (2) Student response questionnaire after applying the teaching factory learning model to the basic concepts of motorbike electricity in class XI TBSM SMK Negeri 1 Nisam is in the very good category with an average score of 83%. (3) teacher activities are in the good category with an overall average score of 3.42 with a percentage of 85.5%, while student activities are in the good category with an overall average score of 3.33 with a percentage score of 83%. Keywords: Teaching Factory, Student Learning Outcomes, Basic Concepts of Motorcycle Electricity
Analisis Energi dan Eksergi Pembangkit Listrik Tenaga Panas Bumi Dieng dengan Penambahan Sistem Double-Flash Menggunakan Metode Termodinamika Pramundana, Arya Pramudya; Pambudi, Nugroho Agung
Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 4 (2025)
Publisher : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/nozel.v7i4.115575

Abstract

Indonesia possesses significant geothermal energy potential, accounting for approximately 40% of the world's total reserves. However, its utilization in power generation is still constrained by system efficiency limitations. This study aims to assess the thermal performance of the Dieng Unit 1 Geothermal Power Plant (GPP), which currently operates with a 55 MW single-flash system, and evaluate performance improvements through the integration of a double-flash configuration. A numerical simulation was conducted using the Engineering Equation Solver (EES) software, based on actual operational data from January to February 2025. The results indicate that the implementation of the double-flash system enhances energy efficiency from 71.87% to 84.1%, and exergy efficiency from 43.17% to 49.11%. Net power output increased by 7,560 kW by re-utilizing brine from the high-pressure separator. The study further investigates the effects of pressure variation in the Low Pressure Separator (LPS) and turbine efficiency on power output, identifying 1.6 bar as the optimal pressure for maximizing exergy input. These findings confirm that the double-flash system effectively reduces energy losses and significantly improves the plant’s thermodynamic performance. This research provides valuable insights for optimizing geothermal power systems, offering strategic solutions for sustainable energy development in high-potential regions like Indonesia.

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