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All Journal Jurnal Energi Dan Manufaktur INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Rekayasa Material, Manufaktur & Energi Logic : Jurnal Rancang Bangun dan Teknologi Lumbung Inovasi: Jurnal Pengabdian Kepada Masyarakat JAMETECH Logic : Jurnal Rancang Bangun Dan Teknologi Journal of Railway Transportation and Technology
I Made Agus Putrawan
Politeknik Negeri Bali
Aerospace Engineering Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Potensi Biogas dari Substrat Bio-Limbah Perhotelan I Nyoman Suprapta Winaya; I Gusti Ngurah Putu Tenaya; I Made Agus Putrawan
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Penelitian ini bertujuan untuk mengetahui potensi produksi biogas yang dihasilkan daripemanfaatan bio-limbah perhotelan seperti limbah dapur (kitchen) dan limbah lumpur (sewage)dengan penambahan inokolum kotoran hewan. Jumlah material kering (total solid, TS) darilimbah hotel akan dikaji untuk diketahui pengaruhnya terhadap produksi biogas yang dihasilkan.Penelitian dilakukan secara eksperimen dengan variasi TS sebesar 3, 4, 5 gram ke dalamsebuah biodigester skala laboratorium kapasitas 1000ml. Pengukuran kinerja dari biodigesterdiamati selama 40 hari dan dilakukan pengkondisian pH pada digester kontrol. Pengujiankandungan gas metana dilakukan secara langsung menggunakan metode absorpsi CO2 Brigongas tester. Hasil penelitian menunjukkan bahwa dengan mengkondisikan pH pada rentang 6,8-7,5 merupakan kondisi ideal bagi bakteri metana sehingga mempengaruhi produksi biogas yangdihasilkan. Komposisi 5 gram TS sewage dengan pH dikondisikan menunjukkan volume spesifikbiogas paling tinggi. Sedangkan persentase gas metana yang dihasilkan tidak memiliki korelasilangsung terhadap komposisi material kering dan menunjukkan fenomena yang hampir seragamKata kunci : Limbah perhotelan, inokolum, biogas, total solidThis study aims to determine biogas production using organic waste as raw material from hotelindustries such as kitchen waste and sewage sludge with the addition of inokolum. Total drymatter (total solid, TS) of organic waste is studied to determine its effect on the biogas production.Experiments was conducted with a variation of TS of 3, 4, 5 grams into a biodigester laboratoryscale of 1000ml. Measurement of the performance of the biodigester was observed for 40 daysand the pH condition in the digester was controlled. Methane gas content was done directly usingBrigon CO2 gas tester. The results showed that the conditioned of pH 6.8 to 7.5 are found as theideal conditions for methane bacteria to produce of biogas. Composition of 5 grams TS sewagewith a conditioned pH showed the highest specific volume of biogas production. While thepercentage of methane gas that is produced does not have a direct correlation to the compositionof TS and show the phenomenon that is almost uniformlyKey words: hotel wastes, inoculum, biogas, total solids
Redesign and Improvement of Pottery Spinner to Increase Worker Producivity I Made Agus Putrawan; I Gede Santosa; Ketut Adi
Logic : Jurnal Rancang Bangun dan Teknologi Vol 20 No 2 (2020): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v20i2.1845

Abstract

Many small industries produce handicrafts related to art in Bali, one of which is pottery. Pottery is an object made of clay which is formed and then burned to be a unique shape such as: jugs, glassware, cauldron, brazier, piggy bank, and other objects. The process of producing pottery required the complex steps, from preparing clay, printing by turning, drying and burning. The main difficulty of pottery producers is in the process of forming shapes which involved the rotating spinner. Most of small industries still use the manual spin control to rotate clay bucket holder. This research aims to re-design of a rotating spin machine from the existing pottery industries to increase the productivity. The sample was overtaken from 12 craftsmen in Singakerta Village, District of Ubud Gianyar, Bali. Sample P0 was given to craftsmen is still used the old design and P1 was given to sample modified and re-designed the old machine with added automatic control of rotating spinner. Workload is calculated based on the worker's pulse rate which is measured using a pulse meter. Research data were analyzed using descriptive and inferential statistics. T-test method was performed to analyzing the differences range between groups P0 and P1 at significance level of 5%. The results showed a workload was decreased from heavy to moderate by 12.09%. Production rate was increased by 282.1%, and productivity increased by 334.6%
SIMULASI CFD PERPINDAHAN PANAS PARTIKEL PADAT PERKOTAAN PADA REAKTOR FLUIDIZED BED I Made Agus Putrawan; I Nyoman Suprapta Winaya; I Made Sucipta
Logic : Jurnal Rancang Bangun dan Teknologi Vol 13 No 1 (2013): March
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

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Abstract

Teknologi fluidized bed (FB) mengalami perkembangan yang pesat dan sukses diaplikasikan untuk berbagai jenis bahan bakar limbah seperti sampah padat perkotaan. Permasalahan yang kompleks dari aliran dua fase pada sistem FB akan diselesaikan menggunakan perangkat lunak CFD untuk mengetahui hidrodinamika terutama karakteristik perpindahan panas yang terjadi. Perhitungan simulasi menggunakan metode Discrete Particles Model (DPM) dan Eulerian Multiphase dari permasalahan aliran gas-padat serta analisis distribusi temperatur yang dihasilkan dengan menggunakan bahan bakar yang mempunyai volatile matter (VM) tinggi seperti sampah. Perhitungan besarnya koefisien perpindahan panas pada reaktor akan dimonitor selama selang waktu 3 detik dengan menggunakan persamaan khusus (custom field function) yang ditulis dalam bahasa C+. Hasil perhitungan didapatkan bahwa VM pada bahan bakar mempengaruhi fluktuasi dari koefisien perpindahan panas. Kecepatan semu fluidisasi juga berdampak besar terhadap karakteristik distribusi temperatur dimana pada kecepatan yang paling tinggi (13cm/s) didapatkan temperatur yang lebih seragam akibat dari semakin stabilnya nilai koefisien perpindahan panas yang terjadi.
Design and Fabrication of a Fixed Bed Pyrolysis with LDPE Plastic Waste I Made Agus Putrawan; I Ketut Gde Juli Suarbawa; I Made Rajendra; INS Winaya
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 21 No. 3 (2021): November
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1435.388 KB) | DOI: 10.31940/logic.v21i3.179-183

Abstract

This paper presents the design of a fixed bed reactor pyrolysis to convert plastic waste type LDPE into condensate oil. The dimensions of the batch type pyrolysis reactor are adapted to household needs and are designed to be easy to operate and transport. From the results at three different pyrolysis temperature variations; 250 oC, 275 oC and 300 oC shows that reactor yields a maximum condensate oil of 45,3wt% at temperature of 300 oC. In addition, the weight of charcoal also decreased along with the increase in operating temperature.
THE EFFECT OF PYROLYSIS TEMPERATURE ON THE HEAT VALUE OF PYRO-OIL USING PLASTIC WASTE I Made Agus Putrawan
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 22 No. 2 (2022): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1488.25 KB) | DOI: 10.31940/logic.v22i2.162-166

Abstract

This work primarily investigated the pyrolysis of smalls scale fixed bed reactor using plastic wastes type LDPE during slow pyrolysis (non-isothermal) in a batch reactor to assess the effect of different temperatures on the product yield and heating value. The calorie bomb of Parr Instrument was performed to investigated heating value of pyro-oil product at different temperatures 250, 275, 300oC. The pyro-oil obtained at higher product yield of 300 oC while the increased temperature will affect to increase the product yield of pyro-oil. The highest heating value of pyro-oil produced at a reactor temperature of 300oC is 9,769.78 cal/gr. From the results of pyro-oil using plastic waste type LDPE, the characteristics of the heating value are equivalent to diesel fuel.
Rancang bangun mesin CNC router 3 axis dengan penggerak ballscrew untuk kerajinan acrylic Pancarana, I Dewa Made; Putrawan, I Made Agus; Gunawan, I Made Rai
Rekayasa Material, Manufaktur dan Energi Vol 8, No 1: Januari 2025
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v8i1.22135

Abstract

This research aims to design, manufacture and test a 3-axis CNC router machine with a ballscrew drive that can process acrylic into an artistic craft that has accurate, precise, neat and effective dimensions. In this research, a design was carried out to design a 3 axis CNC router machine with a ballscrew drive that suits the needs of medium and large scale industries. The working principle of a 3 axis CNC router machine with a ballscrew drive is to create a design using CAD or CAM software, then the design is converted to G-code (machine code), so that the machine can work according to G-code coordinates. The results of this research include design and construction which includes design designs, design calculations, manufacturing processes, and results of the accuracy of using acrylic materials. The results of the design and construction of a 3 axis CNC router machine with a ballscrew drive, namely a cutting work area of 800 mm x 600 mm x 100 mm, using a Breakout board controller as a controller, using a PC or laptop to find out the MDI movement of G-code coordinates. The cutting results of spindle rpm 6000, 8000, and 10,000 with varying feed rates will affect the roughness of the workpiece cutting results. The conclusion from varying the feed rate is: the greater the feed rate in units (mm/minute), the rougher the cutting results. , and vice versa, if the feed rate is smaller, the results of cutting the workpiece will be smoother.          
Performance of Automatic Temperature Control System in Pyrolysis Reactor of LDPE Plastic Waste Putrawan, I Made Agus; Susila, I Nengah Darma; Suparta, I Nyoman
invotek Vol 23 No 3 (2023): INVOTEK: Jurnal Inovasi Vokasional dan Teknologi
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/invotek.v23i3.1129

Abstract

Pyrolysis is a process of decomposing material at high temperatures without or with limited air and is an alternative waste treatment which is considered quite prospective to be developed. Plastic waste treatment as pyrolysis fuel, is strongly influenced by operating conditions, which consist of the thermal properties of plastics such as the LDPE type, which are still massively used in society. This research processes LDPE type plastic waste using technology fixed bed pyrolysis type batch reactor with a capacity of 0.01 m³ with initial heating from external heat of LPG energy source. The pyrolysis process takes in a closed reactor and the mass flow rate of the condensate flows naturally to the condenser for the condensation process to become pyro-oil product. Optimization of the reactor pyrolysis was carried out by adding insulated heat cover to reduce heat losses during the heating process. The addition of automatic temperature control to regulate the heating rate, makes operation control easier and reducing fluctuations in temperature distribution during pyrolysis process. The research was carried out with three operating temperature variations of 250, 275, and 300 °C using 0.8 kg LDPE plastic waste for batch test. The performance of automatic temperature control was observed using a digital thermometer and a comparison of the results before and after installation was carried out at a temperature of 300 °C. The results showed that heating temperature control which was previously done manually gives fluctuating results with a temperature difference of up to 50 °C. With the addition of an automatic temperature control system, the operating temperature during the pyrolysis process shows relatively lower fluctuations with a maximum difference of 20 °C. The initial heating energy consumption from LPG and the fuel consumption rate (FCR) show an increase along with the increase in the pyrolysis operating temperature setting.
ANALYSIS OF THE EFFECTIVENESS OF WATERWHEELS AS WATER PUMP DRIVERS Agung Pradnyana; I Made Anom Adiaksa; I Made Agus Putrawan; I Wayan Suma Wibawa; Made Ardikosa satrya Wibawa
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 2 (2025): July
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i2.132-139

Abstract

A pump is a device used to move liquids from one location to another through a pipeline, typically by increasing fluid pressure using electrical power. This increase in pressure helps overcome various types of flow resistance, such as pressure differences, elevation changes, or frictional losses. Transporting fluids from lowland to highland areas is not a simple task, particularly in remote regions where access to electricity is limited. This research was conducted at Pura Beji, Tanah Lot, Beraban Village, Tabanan Regency—an area that has abundant clean water resources in the lowlands compared to the highlands. The study focuses on the process of transferring clean water using water wheels as mechanical drivers in a system known as PATA Technology (Pompa Air Tenaga Air). Therefore, the objective of this research is to analyze the mechanical power generated by the water wheels and the resulting pumping performance of the water pump. This study investigates the effectiveness of waterwheels as mechanical drivers for water pumps in rural areas with limited electricity access, using the PATA (Pompa Air Tenaga Air) system. According to the research result, it was found that for mass flowrate of water wheel 75.5 kg/s then for the mass flowrate of water pump 14.7 kg/s. The efficiency for the waterwheels against the water pump obtained >40%. The water wheels act as the main drive of the water pump through rotation axle gear mechanism which is transmitted to the housing pump with average power water wheel 650 kg.m/s2
COMBUSTION TEMPERATURE ANALYSIS ON CO EMISSIONS IN A SIMPLE LIGHTWEIGHT BRICK-BASED INCINERATOR Made Ardikosa Satrya Wibawa; I Made Anom Adiaksa; I Made Agus Putrawan; I Wayan Suma Wibawa; Anak Agung Gede Pradnyana Diputra; I Wayan Agus Rantia Dana
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 26 No. 1 (2026): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v26i1.61-70

Abstract

Residual waste management at the community level remains a significant environmental problem, particularly for mixed organic and inorganic waste. The use of a simple incinerator made from lightweight bricks is a practical solution due to its low construction costs and ease of operation. However, incomplete combustion can produce harmful gas emissions such as carbon monoxide (CO). This study aims to analyze the effect of combustion temperature on CO levels produced by a simple three-level incinerator using wood fuel. The incinerator design consists of an ash chamber on the lower level, a wood combustion chamber on the middle level, and a waste combustion chamber on the upper level with a volume capacity of 0.384 m³. The residual waste burned is 10 kg per cycle consisting of a mixture of organic and inorganic waste. Data collection was carried out 20 times by measuring the combustion temperature and CO levels using a gas analyzer. The results show an inverse relationship between combustion temperature and CO levels. Increasing the combustion temperature results in a more complete oxidation process, resulting in a significant decrease in CO levels. This study demonstrates that controlling combustion temperature is an important parameter in improving combustion efficiency and reducing harmful gas emissions in small-scale incinerators.
Studi Eksperimental Perpindahan Panas pada Pengering Sepatu Berbasis Rak Datar Putrawan, I Made Agus; Adiaksa, I Made Anom; Wibawa, I Wayan Suma; Adi, I Ketut
Journal of Applied Mechanical Engineering and Green Technology Vol. 4 No. 1 (2026): April
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jametech.v4i1.20-25

Abstract

Shoe drying is a crucial process for maintaining hygiene and extending the lifespan of footwear, especially in high-humidity environments. This study aims to experimentally investigate the heat transfer characteristics of a flat-rack-based shoe dryer. The system is designed with electric heating elements and a horizontal rack configuration to promote uniform heat distribution. Key observed parameters include inlet air temperature, shoe surface temperature, drying time, and moisture content reduction. Measurements were conducted at multiple rack levels to evaluate vertical and horizontal temperature distribution. The results indicate that forced convection is the dominant heat transfer mechanism, with relatively uniform temperature distribution observed in the middle racks, while the top and bottom racks experienced temperature deviations. The heat transfer by radiation generated by the shoe dryer is 5.41 J/s, and the convective heat transfer is 238.8 J/s. The moisture content loss increases with drying time, indicating that 90 minutes is the optimal drying duration among the tested variations. This study provides a foundation for the development of more energy-efficient shoe drying systems and highlights the potential for integrating alternative heat sources such as solar energy.
Co-Authors Adi, I Ketut Agung Pradnyana Anak Agung Gede Pradnyana Diputra Dadang Sanjaya Atmaja Dimas Adi Perwira Gunawan, I Made Rai Henry Widya Prasetya I Dewa Made Pancarana I GAN Subawa, I GAN I Gede Santosa I Gusti Ngurah Putu Tenaya I Ketut Adi I Ketut Gede Juli Suarbawa I Made Anom Adiaksa I Made Anom Adiaksa I Made Rajendra I Nengah Darma Susila I Nyoman Suparta I Nyoman Suprapta Winaya I Nyoman Suprapta Winaya I Wayan Agus Rantia Dana I Wayan Suma Wibawa I Wayan Suma Wibawa Ilham Satrio Utomo Made Ardikosa Satrya Wibawa Made Ardikosa Satrya Wibawa Made Sucipta Moch Aziz Kurniawan Ni Luh Ayu Kartika Yuniastari Sarja Pamularsih, Tyas Raharjeng Putu Lokantara Rukmi Sari Hartati