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All Journal Logic : Jurnal Rancang Bangun dan Teknologi Logic : Jurnal Rancang Bangun Dan Teknologi
I Made Agus Putrawan
Politeknik Negeri Bali
Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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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

Show Abstract | Download Original | Original Source | Check in Google Scholar

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.
Co-Authors I Gede Santosa I Ketut Adi I Ketut Gede Juli Suarbawa I Made Rajendra I Nyoman Suprapta Winaya Made Sucipta