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All Journal Buletin Udayana Mengabdi Jurnal Energi Dan Manufaktur Bumi Lestari Jurnal METTEK (Jurnal Ilmiah Nasional Dalam Bidang Ilmu Teknik Mesin) Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin Journal of Applied Agricultural Science and Technology Logic : Jurnal Rancang Bangun dan Teknologi International Journal of Engineering and Emerging Technology J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Logic : Jurnal Rancang Bangun Dan Teknologi
I Nyoman Suprapta Winaya
Program Studi Teknik Mesin Universitas Udayana
Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics

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Peningkatan konduktivitas termal lemak sapi sebagai bahan PCM dengan menambahkan arang sekam padi I.M. Astika; I.N.S. Winaya; I.D.G.A. Subagia; I.K.G. Wirawan; I.G.K. Dwijana; I.G.K. Sukadana
Dinamika Teknik Mesin Vol 11, No 1 (2021): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (928.795 KB) | DOI: 10.29303/dtm.v11i1.364

Abstract

Phase change material (PCM) is a material that can absorb and store energy and can release it based on the principle of latent heat energy storage. Beef tallow is one of the materials that can be used as PCM but its low thermal conductivity is around 0.181 W/mK. Hence, thermal conductivity is considered an important factor in the conduction heat transfer.  This further affects kinetic absorption and heat release. However it is possible to increase the values by adding another material that has a high thermal conductivity. The purpose of this study is to elevate the thermal conductivity of beef tallow by adding rice husk char. This research involves direct incorporation method, where beef tallow is thawed and mixed with the rice husk char then stirred with a rotation of 100 rpm until the mixture becomes solid. Addition of rice husk char with weight fractions of 5 and 10% and grain size of 0.045 mm. Subsequently, thermal conductivity test was performed using the TQ Heat Transfer Experiment Base Unit.The results show that with the addition of rice husk can increase the thermal conductivity of PCM beef tallow. The increase obtained in the addition of 10% rice husk char is 37 times compared to the pure sample. Based on this result it is concluded that carbon-based materials such as rice husk char can be used to increase the thermal conductivity of PCM materials.
Biodiesel Production From Sardine Flour Used Cooking Oil Using One Step Transesterification Techniques Atmiral Ernes; Poppy Diana Sari; Rukmi Sari Hartati; I Nyoman Suprapta Winaya
Jurnal Ilmu dan Teknologi Terapan Pertanian Vol 3 No 2 (2019): Journal of Applied Agricultural Science and Technology
Publisher : Politeknik Pertanian Negeri Payakumbuh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32530/jaast.v3i2.109

Abstract

Diesel oil demand as energy source at industrial, transportation and electric generating sector are increasing and it resulted with the decreasing of fossil energy source backup. Biodiesel as an alternative energy source to substitute diesel oil can be utilized from used fried oil of sardine flour. The purpose of this research was to develop the technology to convert used fried oil of sardine flour to become biodiesel using one step trans-esterification technic as an alternative of renewable energy source and also to utilize waste of used oil. Biodiesel made using one step trans-esterification technic with NaOH catalyst concentration 0.5; 1.0; 1.5; 2.0 (% m/m) from total weight of oil and methanol. Trans-esterification process run for 30, 60 and 90 minutes at 65 temperature. The biodiesel obtained was analyzed using gas chromatography and mass spectrometer (GC-MS). The quality was determined by comparing its physicochemical properties and compared to the SNI standard 04-7182-2015. The result of GC-MS showed 10 peaks corresponding to ten methyl ester (biodiesel): octanoic acid methyl ester; decanoic acid methyl ester; dodecanoic methyl ester; tridecanoic acid, 12-methyl-, methyl ester; pentadecanoic acid methyl ester; hexadecatrienoic acid methyl ester, 9-hexadecenoic acid methyl ester, 9-hexadecenoic acid methyl ester, trans-13-octadecenoic acid methyl ester, hexadecanoic acid methyl ester. The biodiesel obtained has a density of 908 kg/m3, viscosity of 3.13 mm2/s, acid value of 0.29 mg-KOH/g found in treatment 1.5% NaOH and time process of 60 minutes. Viscosity and acid value were in a good agreement with SNI standard 04-7182-2015. The research shows that used fried oil of sardine flour has possibility as biodiesel source. Keywords: Biodiesel; sardine flour used cooking oil; trans-esterification
Biogas Utilization Using Fish Waste with Constant Volume of Inoculum Cow-Dung Petr Zamazal; I Nyoman Suprapta Winaya; Ketut Astawa
International Journal of Engineering and Emerging Technology Vol 1 No 1 (2016): July - December
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

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

Abstract

This research used fish waste as a raw material and inoculum cow-dung as a starter to produce biogas. It was calculated the weight of total solid and volatile total solid for the right amount of substrate to be incorporate into the digesters. The variation of 5g, 6g, 7g, 8g, 9g and 10g of volatile total solid was mixed with the inoculum cow-dung 100ml and water as the rest, which was filled up to 300ml of the total volume of slurry. Two digesters with amount of 100ml inoculum cow-dung and 200ml water were used as the comparison. This research was conducted for 30 days and it was measuring pressure in digesters, temperature and pH, which was conditioned once a week with NaOH or H2SO4. The best result can be seen in the variation of 5g fish waste as a substrate. The volume in the digester is 93.93ml/gVS with percentage levels of CH4 by 51% and CO2 by 47%.
Thermal Conductivity and Bending Strength of Coconut Fiber/Paraffin/Graphite Composite Phase Change Materials I Made Astika; I Nyoman Suprapta Winaya; I Dewa Gede Ary Subagia; I Ketut Gede Wirawan
International Journal of Engineering and Emerging Technology Vol 5 No 2 (2020): July - December
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2020.v05.i02.p20

Abstract

The use of composite materials for panel boards, building construction, vehicle accessories, and household furniture is growing. Coconut coir fiber-reinforced composites can be applied as panel boards for building and furniture construction, which can also be used as heat storage systems. The coco fiber composite's low energy storage capacity can be increased by incorporating PCM material into it, forming a PCM composite material. Heat absorption and release performance depend on the material's thermal conductivity, which can be increased by adding additives such as graphite. This paper presents a performance test of PCM composites to obtain bending strength and thermal conductivity. The research materials were coconut coir fiber, polyester, paraffin, and graphite. The weight fractions of coco fiber and polyester were 30 and 50%, respectively. Variation of paraffin weight fraction 15 and 20% and variation of graphite weight 0 and 5%. The method of mixing materials is direct incorporation and forming of PCM composites using a press molding process. The tests carried out include the bending test (ASTM D790-03) and the thermal conductivity test using the Heat Transfer Experiment Base Unit test kit. The results show that the use of 15 wt% paraffin with 5 wt% graphite increases thermal conductivity by 23.27% and increases bending strength by 36.71%.
EFFECT OF ALKALI TREATMENT ON THE TENSILE STRENGTH OF LIDAH MERTUA FIBER/ POLYPROPYLENE RECYCLED BIOCOMPOSITE I Putu Lokantara; NPG Suardana; IW Surata; INS Winaya
International Journal of Engineering and Emerging Technology Vol 4 No 2 (2019): July - December
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2019.v04.i02.p09

Abstract

The purpose of this study was to determine the effect of alkali fiber treatment on the tensile strength of composites. The material in this study was recycled polypropylene from plastic beverage glass and lidah mertua fiber with a fiber length of 180 mm, fiber treatment using 5% NaOH and without treatment. Composite specimens were prepared using the hot press method at 170oC for 120 minutes. Tensile testing with the dimensions of the test specimen refers to ASTM D-638. The results of the test carried out the maximum tensile strength value of 71,606 MPa in fiber with 5% alkali treatment. The tensile strength of composites with alkali treatment increased 223% compared to the tensile strength without alkali
Solid Catalyst in Esterification and Transesterification Reactions for Biodiesel Production: A Review Nengah Simpen; IN. Suprapta Winaya; ID.G. Ary Subagia; IW. Budiarsa Suyasa
International Journal of Engineering and Emerging Technology Vol 5 No 2 (2020): July - December
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2020.v05.i02.p29

Abstract

Biodiesel is considered as an important substitute for the replacement of fossil diesel due to its biodegradable, renewable and non-toxicity to environment. Biodiesel consist of mixture of mono alkyl esters of long chain fatty acids. It is produced from vegetable oils, animal fats and waste cooking oil. Solid catalysts are promising and advantageous for biodiesel production because those could be reusable, environmentally benign and are more effective than liquid catalysts. Moreover, the application of solid catalysts does not produce soaps through triglycerides saponification or free fatty acids neutralization. When triglycerides as major component of oil react with alcohol (methanol or ethanol) to form biodiesel in the presence of base catalyst, this called is transesterification. When acid catalysts are used for reducing free fatty acids to form biodiesel, this called is esterification. The application of solid catalysts in esterification and transesterification reactions for biodiesel production are discussed in this review.
HEAT TRANSFER RATE OF SINTERED ZEOLITE WICK HEAT PIPE Luh Putu Ike Midiani; I Nyoman Suprapta Winaya; Wayan Nata Septiadi; Made Sucipta
International Journal of Engineering and Emerging Technology Vol 5 No 1 (2020): January - June
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2020.v05.i01.p03

Abstract

This paper discusses about heat transfer rate in heat pipe with sintered zeolite wick. The type of zeolite is natural zeolite and activated zeolite. Zeolite used in powder form divided into two grain size i.e. 100 µm and 200 µm. Wick were made by sintering process. Calculation of the heat transfer rate for sintered zeolite heat pipe shows sintered zeolite activates heat pipe has the highest heat transfer rate.
The Hardness Analysis of Epoxy Composite Reinforced with Glass Fiber Compared to Nettle Fibers I Gede Putu Agus Suryawan; NPG Suardana; IN Suprapta Winaya; IWB Suyasa
International Journal of Engineering and Emerging Technology Vol 5 No 1 (2020): January - June
Publisher : Doctorate Program of Engineering Science, Faculty of Engineering, Udayana University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/IJEET.2020.v05.i01.p02

Abstract

The purpose of this study is to compare the hardness of glass fiber reinforced composite materials with the hardness of netted fiber-reinforced composite materials. Glass fiber is a commercial fiber that has been used in various industries while nettle fiber is a natural fiber that is more environmentally friendly. Composite material has several advantages, namely the form that can be adjusted, high strength, lightweight and resistant to corrosion. Nettle plants are plants that have strong fibers in the bark. In this study, nettle composites were made with variations in the weight fractions of 10%, 15%, and 20%. Hardness testing used the Shore D Durometer. The results of the hardness value of glass fiber composites with weight fractions of 10%, 15%, and 20% are 82.4 Shore D, 84.5 Shore D, and 86.5 Shore D, show an increase in stable hardness because the glass fiber factor is already commercial, the fiber strength is evenly distributed. The hardness values of nettle fiber composites with fractions of 10%, 15%, and 20% are 81.6 Shore D, 85 Shore D, and 86.6 Shore D, the hardness value of each nettle composite increases with the addition of fiber weight fraction but is unstable due to the strength factor of each nettle single fiber uneven. Furthermore, with the right treatment, nettle fiber can replace glass fiber.
PEMODELAN CFD PERILAKU FLUIDISASI HAMPARAN PARTIKEL SEWAGE SLUDGE I Nyoman Gede Sujana; I Nyoman Suprapta Winaya; 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 | Full PDF (153.803 KB)

Abstract

Dalam menjalankan fungsi maupun produksinya di tempat-tempat tertentu seperti pusat perdagangan, perhotelan, perbankkan, rumah sakit maupun industri, memerlukan energi listrik secara kontinu dan handal.Untuk itu biasanya dipergunakan generator set (genset) sebagai sumber energi listrik cadangan untuk memback-up suplai utama (PLN). Sebagai kontrol kapan genset mengambil alih suplai tenaga listrik ke beban ataupun sebaliknya dipergunakan sebuah sistem atau alat yang disebut Automatic Transfer Switch (ATS) – Automatic Main Failure (AMF). Sesuai dengan namanya alat ini dapat bekerja secara otomatis. Untuk mengetahui dan memahami cara kerja rangkaian control ATS – AMF ini hendaknya dipahami terlebih dahulu komponen-komponen pendukungnya. Dari hasil analisis yang dilakukan dapat diuraikan bahwa komponen-komponen yang dirangkai menjadi sistem ATS – AMF, mempunyai peran masing-masing diantaranya : sebagai proses pemanasan serta start genset saat PLN padam, mematikan genset saat PLN hidup kembali, sebagai start bantu bila terjadi gagal start, serta mematikan genset saat terjadi gangguan over heating dan low pressure oil .
FLUIDIZED BED GASIFICATION BERBAHAN BAKAR BIOMASSA DAN BATUBARA DENGAN VARIASI KOMPOSISI BAHAN BAKAR I Putu Angga Sukma Primantara; I Nyoman Suprapta Winaya; I Made Widiyarta
Logic : Jurnal Rancang Bangun dan Teknologi Vol 14 No 3 (2014): November
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (265.624 KB)

Abstract

:Gasifikasi merupakan sistem konversi bahan bakar mentah untuk dirubah menjadi gas yang mampu bakar, di beberapa negara gas ini akan digunakan untuk bahan bakar mesin diesel pada pembangkit listrik. Batubara biasanya digunakan sebagai bahan bakar utama dalam proses gasifikasi karena memiliki karbon dan nilai kalor yang cukup tinggi, namun di sisi lain batubara memiliki tingkat polusi yang cukup besar jika digunakan terus menerus dan batubara merupakan unrenewable energi dan ketersediaanya mulai menipis. Untuk mengatasi masalah tersebut dapat dilakukan dengan cara co-gasifikasi, dimana sistem ini adalah pencampuran dua bahan bakar atau lebih yang bertujuan untuk meningkatkan performansi proses gasifikasi. Penelitian ini menggunakan empat jenis biomassa dicampur dengan batubara pada variasi komposisi massa (50%-50%, 60%40%, 70%-30%) dengan temperatur operasi 600OC. Reaktor gasifikasi berteknologi fluidized bed dengan diameter gasifier 96cm dan tinggi 162 cm menggunakan oil burner untuk memanaskan hamparan bed hingga mencapai teperatur operasi agar dapat terjadinya auto ignition. Keunggulan reaktor ini dapat digunakan untuk mengkonversi berbagai jenis bahan bakar dengan nilai kalor yang rendah untuk menghasilkan gas mampu bakar. Distribusi temperatur yang merata sepanjang reaktor diperoleh pada semua penelitian, persentase gas mampu bakar mengalami peningkatan dalam setiap penelitian, efisiensi konversi karbon tertinggi sebesar 86.10% dan efisiensi gasifikasi sebesar 95.09% pada penelitian komposisi 70% cangkang kelapa sawit dengan 30% batubara. Gas mampu bakar dan efisiensi gasifikasi mengalami peningkatan ketika bertambahnya massa biomassa pada perbandingan komposisi massa bahan bakar.
Co-Authors A.A. Krisna Wira Putra Ahmad Maulana K Atmiral Ernes Dedy Haryanto G.B. Heru K Giarno . Gusti Ngurah Agung Satria Prasetya D.Y I .G. P. Agus Suryawan I B Ardhikayana I Dewa Gede Ary Subagia I Dewa Made Susila I G.N.A. Satria Prasetya D. Y. I Gede Hendra Gunawan I Gede Wiratmaja I Gusti Bagus Wijaya Kusuma I Gusti Komang Dwijana I Gusti Ngurah Priambadi I Gusti Ngurah Putu Tenaya I Ketut Adi Sugita I Ketut Gede Juli Suarbawa I Ketut Gede Wirawan I Ketut Wijaya I Made Agus Putrawan I Made Agus Putrawan I Made Astika I Made Panji Tirta Prakasa I Made Rajendra I Made Widiyarta I Nengah Simpen I Nyoman Gede Sujana I Nyoman Sujana I Nyoman Winjaya Putra I Putu Angga Sukma Primantara I Putu Angga Yuda Pratama I W BUDIARSA SUYASA I Wayan Ambara Antara I Wayan Arya Darma I Wayan Bandem Adnyana I Wayan Sukerayasa I Wayan Surata I Wayan Widhiada I.G.K. Sukadana I.K.G. Wirawan I.M. Astika Ida Bagus A. Swamardika Ida Bagus Agung Darma Susila Ida Bagus Gde Ardhikayana K.Amerta Yasa Ketut Astawa Luh Putu Ike Midiani Made Sucipta Mulya Juarsa Nathaniel Ezer Putra Darmawan Ni Made Ary Esta Dewi Wirastuti NPG Suardana Petr Zamazal Poppy Diana Sari Putu Brahmanda Sudarsana Putu Lokantara R.S. Hartati Rukmi Sari Hartati Siti Helmyati Temaja, I Wayan Wayan Gede Ariastina Wayan Nata Septiadi