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<![CDATA[Analisis Pengaruh Nanofluida TiO2-(Air-Propilen Glikol) Pada Sistem Pendingin Terhadap Kinerja Sistem Pendingin dan Daya Listrik yang Dihasilkan oleh Micropower Generation ]]>
<![CDATA[Santoso, M. Ferry Teguh]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 4 (2025) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v7i4.105161
<![CDATA[An The use of Micro Power Generation (MPG) or small-scale power plants based on micro combustion using the Thermoelectric Generator (TEG) converter type. This study aims to determine the performance of the TiO2 nanofluid cooling system with the basic fluid of water-propylene glycol mixture on the performance of the cooling system in this case, namely temperature and viscosity, as well as the electric power generated by MPG. The research method used is the experimental method. The variables used are variations in the concentration ratio of the mixture of water with propylene glycol which is used as the base fluid for TiO2 nanofluids in the cooling system. The variation of the ratio used for the mixture of propylene glycol and water is 25%: 75% with a total volume of 2.4 L of cooling fluid and 96 grams of nanoparticles. Tests were carried out by combustion in a double meso vortex combustor with propane gas fuel and air. Then the flame is stabilized with a mass flow meter. The temperature of the hot side and cold side of the TEG is measured using a thermocouple to produce a temperature difference (∆T) between the two sides. While the resulting output in the form of voltage (Volt) and current (Ampere) is measured with a multimeter and then accumulated in the form of Power (Watt). The results of the study were taken on average produced by nanofluid variations with 25% propylene glycol and 75% water base fluid of 7.08 watts. The average hot side is 148.35 °C, the average cold side is 36.20 °C with the highest voltage of 9.24 V, and an electric current of 0.77 A. This shows that there is an effect of TiO2-(water-propylene glycol) nanofluid in the cooling system on the performance of the cooling system and the electric power generated by the micropower generation.]]>
<![CDATA[STUDI KESIAPAN MAGANG INDUSTRI (MI) MAHASISWA PROGRAM STUDI PENDIDIKAN TEKNIK MESIN FKIP UNS ]]>
<![CDATA[Rohman, Ngatou]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 5, No 1 (2023) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v5i1.72282
<![CDATA[The FKIP UNS Mechanical Engineering Education study program is one of the clusters in vocational education that produces vocational teacher candidates. To equip the competencies required to become a SMK teacher in the field of Mechanical Engineering and Automotive Engineering, it is necessary to gain experience in the industry. Industrial Internship is one of the subjects that must be taken by students of the Mechanical Engineering Education Study Program FKIP UNS as a graduation requirement. To examine the extent to which students carry out industrial apprenticeship programs in terms of the aspects of students and study programs, it is necessary to conduct research on the analysis of Industrial Internship readiness of students of the Mechanical Engineering Education Study Program FKIP UNS which can then be used as a basis for making policies regarding industrial apprenticeships. The design in this research is descriptive quantitative. The data collection technique was carried out in a survey using a questionnaire. The respondents in this study were all students of the Mechanical Engineering Education Study Program FKIP UNS class of 2020 or semester IV who will carry out the Industrial Internship program in 2022. The research data were analyzed descriptively with the help of the SPSS program. The results showed that 1) the readiness for industrial internships for students of the Mechanical Engineering Education Study Program FKIP UNS class of 2020 was 3.93 which was in the good category. 2) in providing industrial apprenticeship services for students, the Mechanical Engineering Education study program FKIP UNS makes an industrial apprentice manual and appoints an industrial apprentice coordinator.]]>
<![CDATA[PENGARUH VARIASI PENAMBAHAN FLY ASH & BENTONIT TERHADAP SIFAT PASIR CETAK DAN CACAT GASHOLES PADA HASIL PENGECORAN LOGAM ALUMINIUM ]]>
<![CDATA[Bahrudin, Faqih]]>;
<![CDATA[Harjanto, Budi]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 1, No 1 (2019) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v1i2.30430
<![CDATA[The objectives of this study to describe: (1) The effect of adding fly ash and bentonite to the permeability of molding sand. (2) The effect of adding fly ash and bentonite to the moisture of molding sand. (3) The effect of adding fly ash and bentonite to gasholes defect on aluminium metal casting. This study is conducted at Polytechnic of Manufaktur Ceper, Klaten. The method that used is pre-experimental design which one-shot case study design. The compositions of the molding sand are varied is fly ash and bentonite. The Sample variations are divided into 4 types based on fly ash and bentonite concentration. The comparison of fly ash and bentonite concentration are: variation A are 0%:9%, variation B are 1%:8%, variation C are 2%:7%, and variation D are 3%:6%. The tests which is done in this study such as permeability test by using permeability tester, moisture test by using moisture tester, and gaholes defect test by using visual observation and calculation of gasholes defect.The results showed that: (1) The adding fly ash and bentonite can decreased the permeability values of molding sand. The lowest permeability values occur at variation D that is 85.34 cm3/min. (2) The adding fly ash and bentonite can decreased the moisture of molding sand. The lowest moisture values occur at variation D that is 5,26 %. (3) The adding fly ash and bentonite can improved the quality of castings. The results of castings at variation B which adding fly ash and bentonite has less gasholes defects compared with variation which no adding fly ash that is 3,15 cm3]]>
<![CDATA[PENGARUH MEDIA PENDINGIN PADA PENGELASAN BAJA S45C MENGGUNAKAN METODE PENGELASAN GAS METAL ARC WELDING TERHADAP KEKERASAN DAN STRUKTUR MIKRO ]]>
<![CDATA[Rachmadani, Rachmadani]]>;
<![CDATA[Suharno, Suharno]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 1 (2020) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v2i1.43237
<![CDATA[This study aims to determine the effect of cooling media on microstructure and hardness values on alloy steel S45C using the welding method of Gas metal arc welding (GMAW). This research is using an experimental method. The data analysis technique used is descriptive comparative. The tool used for microstructure testing is Olympus Metallurgical Microscope and hardness test using the Vickers Hardness Tester. Based on the results of the study, it can be concluded that the results of the microstructure show an increase in the structure of pearlite after welding. In raw material, ferrite structures are seen evenly but in the welding results, GMAW which has cooled by using water, air, and oil cooling media show that ferrite is reduced in each specimen, so the pearlite structure dominates. The values of hardness and microstructure in the welding results using water, oil and aircooling media show differences in the level of hardness and microstructure. Specimens with water cooling media at the Heat Affected Zone (HAZ) test point have a higher hardness level of 315.4 VHN when compared to specimens using an oil cooling medium of 268.7 VHN and air conditioning media of 177.4 VHN. Specimens with water cooling media the microstructure in the Heat Affected Zone (HAZ) section showed more pearlite which was evenly distributed compared to specimens using other cooling media, or it could be concluded that the further away from the Las area and HAZ the smaller the pearlite content. This study shows that welding using variations in cooling media changes the microstructure and influences the hardness value of the S45C steel alloy]]>
<![CDATA[Pengaruh Desain Magnet Pada Rotor Generator Dan Variasi Kecepatan Angin Terhadap Energi Listrik Yang Dihasilkan Oleh Turbin Angin Sumbu Horizontal Skala Mikro ]]>
<![CDATA[Albab, Mohamad Ulil]]>;
<![CDATA[Bugis, Husin]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 3, No 4 (2021) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v3i4.63007
<![CDATA[Energy use in Indonesia is increasing while energy reserves in Indonesia are running low. In an effort to meet energy needs in Indonesia, there must be the development of renewable energy sources by utilizing wind energy to be converted into electrical energy using a horizontal wind turbine generator. To optimize the wind turbine generator, you can change its parameters, one of which is by changing the design of the generator magnet. The method used in this study is an experimental method, where the variables used in this study are the design of the magnet skew, the design of the interior magnet and the design of the magnet surface. This research was conducted at wind speeds of 1 m/s to 5 m/s using a wind tunnel. Tests were carried out using 12 V and 24 V lamp loads and no-load tests to determine the power generated by each generator. The results of the research are the design of the magnet on the generator rotor and variations in wind speed affect the power produced by the wind turbine, the magnetic skew produces a power of 0.974 W, the interior magnet produces a power of 0.674 W and the surface magnet produces a power of 1.386 W. Tests without load and speed variations The wind affects the power produced by the wind turbine, where the power at the generator cannot be calculated. Tests with loading and wind speed variations affect the power produced by the wind turbine, where each loading test has various results such as when a load is given to the magnetic surface design at a wind speed of 5 m/s with a loading of 24 V producing a power of 1.386 W.]]>
<![CDATA[STUDI KARAKTERISTIK PROSES PIROLISIS CEPAT RDF-5 BEBRBAHAN DASAR LIMBAH AREN DAN KOPI DENGAN PENGIKAT LIMBAH PLASTIK TERHADAP KUANTITAS BIO-OIL ]]>
<![CDATA[Riswanda, Muhammad]]>;
<![CDATA[Saputro, Herman]]>;
<![CDATA[Wijayanto, Danar Susilo]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 4, No 4 (2022) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v4i4.72277
<![CDATA[Currently, the Indonesian people are faced with various problems in terms of waste management, both organic and inorganic waste. Some of the wastes that can be used are palm waste, coffee grounds and HDPE plastic waste which can be used as alternative fuels, one of which is through the pyrolysis process. Pyrolysis is a process of chemical decomposition of a material thermally in the absence of oxygen. This pyrolysis process converts RDF-5 biomass into a liquid smoke product in the form of bio-oil. This study aims to determine the quantity of pyrolysis oil through the best variation of the composition ratio used. In this study used composition ratio variables, namely 50%:30%:20%, 40%:40%:20%, and 30%:50%:20%. The results of this study obtained the best quantity from a mixture ratio of 50% palm waste, 30% coffee grounds and 20% HDPE plastic to produce 200 ml. The composition ratio affects the quantity of pyrolysis oil results. RDF-5 from palm waste and coffee grounds with HDPE plastic waste binder produces a quantity that tends to decrease as the composition ratio of palm waste waste decreases.]]>
<![CDATA[Analisis Kinerja Buck Boost Converter LTC3780 Pada Sistem Micro Combustion Untuk Pengisian Baterai Lithium ]]>
<![CDATA[Hidayatullah, Arrafi Nur]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 4 (2025) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v7i4.105162
<![CDATA[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.]]>
<![CDATA[Analisis Kinerja Sistem Pengisian Baterai Lithium-Ion Menggunakan Buck Converter LM2596 Pada Micropower Generation Berbasis Thermoelectric ]]>
<![CDATA[Muayad, Muhamad Khizam]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 7, No 3 (2025) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v7i3.105135
<![CDATA[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. ]]>
<![CDATA[PENGARUH PRE-HEATING PADA PIROLISIS BIOMASSA LIMBAH AREN TERHADAP CHAR PADA REAKTOR HORIZONTAL MODEL CONTINUOUS ]]>
<![CDATA[Russiadi, Roli]]>;
<![CDATA[Saputro, Herman]]>;
<![CDATA[Bugis, Husin]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 4, No 1 (2022) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v4i1.72188
<![CDATA[Utilization of palm waste in the form of charcoal briquettes makes the fuel more efficient and in a better form. Thus, charcoal briquette fuel with sugar palm waste is a solution or alternative to solving the waste problem caused by palm trees. This research was conducted with the aim of knowing the effect of pre-heating on the pyrolysis process of palm sugar waste biomass on gas fraction, bio-oil and char. This study used an experimental method conducted in the Mechanical Engineering Education Laboratory of Sebelas Maret University. The research variable is the variation of pre-heating time in the pyrolysis of palm waste biomass against gas fraction, bio-oil and char in a continuous model horizontal reactor. The result of this study is that pre-heating has an effect on the gas fraction. The longer the pre-heating process is carried out, the lower the amount of O2 gas produced. Pre-heating affects the char, so the quality and quantity can be measured.]]>
<![CDATA[PENGARUH MATERIAL BILAH DAN KECEPATAN ANGIN TERHADAP PERFORMANSI TURBIN ANGIN HORISONTAL SKALA MIKRO ]]>
<![CDATA[Fahrudin, Mahfudz]]>;
<![CDATA[Bugis, Husin]]>;
<![CDATA[Saputro, Herman]]>
<![CDATA[ Nozel : Jurnal Pendididikan Teknik Mesin Vol 2, No 2 (2020) ]]>
Publisher : <![CDATA[Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta ]]>
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DOI: 10.20961/nozel.v2i1.43234
<![CDATA[The availability of fossil fuels in Indonesia has recently been running low due to exaggerated use of the fuel. To fulfill the electrical energy needs of the community which more environmentally friendly used, wind turbines can be used. In this study, researchers use a micro-scale horizontal axis wind turbine from wood and composite materials on the blades, where it try to determine the effect of each performance. This study uses an experimental method which is carried out at the Wind Tunnel Laboratory of the Mechanical Engineering Education, Sebelas Maret University. The variables are blades with a variety of composite and wood material. Performance of electrical power is investigated in this research. Data shows that the wind speed 5m/s - 6m/s composite without load produces the highest rotate, which is 544.64 rpm. While, wood material take lower at 494.2 rpm. The wind turbine is driven at 5 m/s – 6 m/s by using 12V of load. It produces 367.68 rpm and 6.771 watts for composites, and 303.6 rpm and 5.047 watts for wood. So it can be concluded blade materials could effect to the turbine performance.]]>
