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All Journal Jurnal Teknosains JURNAL INTEGRASI Logic : Jurnal Rancang Bangun dan Teknologi Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat JAMETECH Logic : Jurnal Rancang Bangun Dan Teknologi

I Putu Gede Sopan Rahtika

Politeknik Negeri Bali

Author-ID : 2995851

Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Mechanical Engineering Medicine & Pharmacology Public Health Other

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Articles

Karakteristik temperatur fluida dingin pada grooved double pipe heat exchanger Putu Wijaya Sunu; I Putu Darmawa; Anak Agung Ngurah Bagus Mulawarman; I Made Suarta; I Putu Gede Sopan Rahtika
Jurnal Teknosains Vol 10, No 1 (2020): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.43291

Heat exchangers have widespread applications in many industrials process. There are many kind of heat exchanger. One of the simply heat exchanger is double pipe heat exchanger. The need for lightweight and enhancing the heat transfer of heat exchanger accomodated by surface engineering. One of the surface passive technique applications is groove. Incising groove in pipe as concerned wide consideration as it need no additional power, decrease in weight of system and hence give more benefit in heat transfer. The characteristics of heat transfer in grooved double pipe heat exchanger was investigated experimentally in this article. The aim of this investigation is to reveal the phenomenon of temperature characteristics of cold fluid in the heat transfer process in the grooved double pipe heat exchanger. In this study, water are used as both hot and cold fluid with counter flow pattern, and the water flow rate equal to 15 lpm for both fluid. Grooves were incised on the annulus area in the outer wall of tube side with rectangular shape and circumferential pattern. The characteristics of groove dimension that are height of groove is 0,3 mm; distance between grooves is 8 mm; and the groove space which is as independent variables are 1 mm and 2 mm. The data from 1 mm and 2 mm grooves space were compared with no grooved double pipe heat exchanger data (smooth pipe). The hot fluid temperature is 50 ± 0,50C while the cold fluid temperature is 30 ± 0,50C. The temperature data on the inlet and outlet side of heat exchangers for smooth pipe, 1 mm and 2 mm groove space were compared to find out the characteristics of increasing cold fluid temperature. This study used the temperature rate and temperature acceleration method to compare the variables. The result shows that groove installation increases the amount of heat absorbed by cold fluid. The heat exchanger with 1 mm groove spaces, was able to absorb heat about ± 2.3 % better than heat exchanger with 2 mm groove space and 13,1 % better than heat exchanger with no groove.

Experimental Investigation on the Effect of Angles of Attack to the Flutter Speed of a Flat Plate in Axial Flow I Putu Gede Sopan Rahtika; I Made Suarta; I Komang Rusmariadi; Putu Wijaya Sunu
Logic : Jurnal Rancang Bangun dan Teknologi Vol 21 No 2 (2021): 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.v21i2.2630

The application of flat plates to the field of wind harvesting requires a lot of research toward the understanding of the flutter behavior of the plates. There are shortages of articles that discuss the effect of varying the angles of attack to the flutter speed of a flat plate. This research aims to conduct a basic experimental research on the effect of relative position of a thin-flat plates to the direction of the air flow to its flutter speed. In this study, a thin-flat plate was placed in a subsonic wind tunnel to test its flutter speed. The position of the plate was varied in various angles of attack. The effect of the angles of attack to the flutter speed was observed.

RANCANG BANGUN PURWARUPA TEKNOLOGI MIKROHIDRO MENGGUNAKAN KONSEP HIDRO FLUTTER I P G Sopan Rahtika; I Made Suarta; Putu Wijaya Sunu
JURNAL INTEGRASI Vol 11 No 1 (2019): Jurnal Integrasi - April 2019
Publisher : Politeknik Negeri Batam

The decline of the world oil reserves is a global crisis for decades to come. The search for renewable energy alternatives is an urgent topic of current research trends. Indonesia has an abundance of energy availability in the form of potential microhydro development. This research is a research of development of new innovative technology in microhydro technology in the form of conversion technique of water flow energy into electric energy using hydro flutter technology. In this research, the development of new tool to convert energy from water flow into electrical energy was developed. A prototype was built that can extract energy from the water stream at times into mechanical energy ready for conversion into electrical energy using the hydro flutter principle of a flexibly mounted free leading edge cantilevered rigid plate. The advantages of the new concept are the simplicity of the design and the ability to clean the system by itself, thereby reducing the maintenance costs.

PERAN PENGELOMPOKAN MOLEKUL PADA HYDROUS ETANOL TERHADAP KINERJA MESIN I Made Suarta; I Putu Gede Sopan Rahtika; Putu Wijaya Sunu; Ketut Bangse; I Nengah
JURNAL INTEGRASI Vol 11 No 1 (2019): Jurnal Integrasi - April 2019
Publisher : Politeknik Negeri Batam

In this study observed the role of molecular clustering on engine performance produced by hydrous ethanol fuel (95.5% v). The test was performed using variation load for four-cylinder motor. Engine performance is measured using Brake Power Engine load cell type indicator TD 800PM. The engine performance produced by anhydrous ethanol was also tested. The resulting engine performance of both fuels is compared. The results showed that the power produced by hydrous ethanol was slightly higher than that of anhydrous ethanol. The charging effisiency generated by hydrous ethanol is upper than that of anhydrous ethanol.

Perbandingan konsumsi bahan bakar pada sistem injeksi dan sistem karburator I Nyoman Suparta; I Made Suarta; I Putu Gede Sopan Rahtika; Putu Wijaya Sunu
Journal of Applied Mechanical Engineering and Green Technology Vol. 2 No. 3 (2021): November 2021
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Isu dunia yang paling bayak dibicarakan adalah masalah energi dan kesehatan. Kekhawatiran terhadap pasokan energi telah memotivasi produsen otomotif mencari solusi untuk menghemat penggunaan bahan bakar. Salah satu solusi dikembangkan saat ini adalah mengganti sistim bahan bakar konvensional menjadi injeksi. Pengujian perbandingan kebutuhan bahan bakar antara sepeda motor karburator dan injeksi pada penelitian ini dilakukan menggunakan jenis motor 4 tak, kapasitas 110 cc, transmisi CVT. Pengujian dilakukan secara eksperimental. Hasil pengujian menunjukkan sistim bahan bakar injeksi lebih hemat 19,3% pada semua tingkat kecepatan.

Mold Design for Injection Molding Machine Using Recycled Aluminum Renaldy, Amadeus; Baiti, Risa Nurin; Rahtika, I Putu Gede Sopan; Widantha, Komang Widhi
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.54-60

The use of aluminum is widely spread from beverage cans, car parts, airplanes, trains, and household furniture. This is due to its lightweight and good corrosion resistance. However, as a metal aluminum waste is difficult to be decomposed naturally. Aluminum metal takes 80 to 100 years to decompose. So the accumulation of untreated scrap aluminum can pollute the environment. One of the solutions is to recycle aluminum by melting and re-casting it into a new shape: a mold for polymer processing. The waste of beverage cans was cleaned from any dirt and adhesive. Then, they were turned into small parts by a crusher. The melting process was done at 650oC. The molten aluminum was poured into a sand mould in the shape of mould of a tensile testing specimen. The recycled product can be used to prepare tensile testing samples of polymer or polymer-based composite with injection molding technique. To evaluate the quality of recycled aluminum, a hardness test was done with a value of 69.31 + 3.02 HB. This value is lower than first-use aluminum. This is due to a combination of microstructural changes due to repeated heating, the presence of additives and impurities, and the effects of heat treatment and open cooling. Metallographic testing was carried out to evaluate the microstructure of the material resulting from the smelting of scrap aluminum using sand molds. In this test, the etching solution used consisted of 100 ml of water and 20 g of sodium hydroxide. The results of the metallographic images on the recycled aluminum material show the presence of a stand-alone silicon (Si) element and an aluminum-copper alloy (CuAl₂).

Model Sistem Pengolahan Pupuk Organik untuk Mendukung Ekowisata di Desa Munduk Kecamatan Banjar Kabupaten Buleleng I Made Anom Adiaksa; I Wayan Marlon Managi; I Ketut Gde Juli Suarbawa; I Putu Gede Sopan Rahtika; M. Yusuf
ABDI: Jurnal Pengabdian dan Pemberdayaan Masyarakat Vol 7 No 3 (2025): Abdi: Jurnal Pengabdian dan Pemberdayaan Masyarakat
Publisher : Labor Jurusan Sosiologi, Fakultas Ilmu Sosial, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/abdi.v7i3.1305

Kegiatan pengabdian ini bertujuan untuk memberdayakan masyarakat Desa Munduk melalui pengolahan limbah pertanian dan peternakan menjadi pupuk organik, serta mendukung pengembangan ekowisata berbasis pertanian. Model sistem pengolahan pupuk organik yang diterapkan melibatkan pembuatan pupuk kompos padat dari kotoran sapi dan pupuk organik cair dari batang pisang, menggunakan aktivator EM4. Hasil kegiatan menunjukkan bahwa pupuk kompos dengan EM4 dapat diproduksi dalam waktu 20 hari, lebih cepat dibandingkan dengan metode konvensional yang membutuhkan 40 hari. Pupuk cair (POC) yang dihasilkan siap digunakan dalam waktu 7–14 hari dan terbukti meningkatkan jumlah bunga dan buah pada tanaman cabai sebesar 18% lebih banyak dibanding kontrol. Kegiatan ini memberikan dampak positif dalam aspek ekonomi, dengan pengurangan biaya pembelian pupuk kimia sebesar ±30% dan potensi usaha pupuk organik lokal. Dalam aspek sosial, masyarakat memperoleh keterampilan baru dalam pengolahan limbah dan membentuk kelompok tani yang mandiri. Selain itu, integrasi pengolahan pupuk organik dengan ekowisata edukatif memberikan kontribusi pada penguatan daya tarik wisata desa dan edukasi lingkungan. Kebaruan program ini terletak pada pendekatan inovatif yang menggabungkan pengolahan pupuk organik dengan pengembangan ekowisata berbasis pertanian berkelanjutan. Ke depan, model sistem ini dapat dikembangkan lebih lanjut dengan meningkatkan skala produksi pupuk organik, memperkenalkan diversifikasi produk, serta mengintegrasikan energi biogas dari limbah ternak, untuk mendukung keberlanjutan ekonomi dan lingkungan Desa Munduk.

Co-Authors Anak Agung Ngurah Bagus Mulawarman I Ketut Gede Juli Suarbawa I Komang Rusmariadi I Made Anom Adiaksa I Made Suarta I Made Suarta I Made Suarta I Nengah I Nyoman Suparta I Putu Darmawa I Wayan Marlon Managi Ketut Bangse M. Yusuf Putu Wijaya Sunu Renaldy, Amadeus Risa Nurin Baiti Widantha, Komang Widhi

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