Garuda - Garba Rujukan Digital

p-Index From 2020 - 2025

0.562

P-Index

This Author published in this journals

All Journal Jurnal Teknik Mesin Jurnal Energi Dan Manufaktur Ecotrophic, Journal of Environmental Science Dinamika Teknik Mesin : Jurnal Keilmuan dan Terapan Teknik Mesin JURNAL INTEGRASI Matrix : Jurnal Manajemen Teknologi dan Informatika Bhakti Persada Jurnal Aplikasi IPTEKS Automotive Experiences

I Made Rasta

Jurusan Teknik Mesin, Politeknik Negeri Bali

Author-ID : 358104

Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Other

Published : 11 Documents Claim Missing Document

Claim Missing Document

Articles

1 2

Pengaruh Laju Aliran Volume Chilled Water Terhadap NTU pada FCU Sistem AC Jenis Water Chiller I Made Rasta
Jurnal Teknik Mesin (Sinta 3) Vol. 9 No. 2 (2007): OCTOBER 2007
Publisher : Institute of Research and Community Outreach, Petra Christian University

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

Water Chiller Air Conditioning (AC) is an air conditioning system that has ability for cooling more than one room. The water chiller AC have two cycles consist of primary and secondary cycles. In the primary cycle, refrigerant is used as working fluid while in the secondary cycle, the water is used as working fluid. To determine the heat absorbed by water, it can be done by analyzing NTU (Number of Transfer Unit) of the water chiller system. The variation of the chilled water volume rate applied in this research was from 13 l/min to 5 l/min, with the interval of 0.5 l/min. As a result, it was founded that the maximum value of NTU was 2.01, at chilled water volume rate of 12 l/min. Below that chilled water volume rate, values of NTU would decrease and stable. It can be concluded that the volume rate of chilled water influenced the value of NTU in the FCU (Fan Coil Unit) of the water chiller AC system. Abstract in Bahasa Indoensia: AC water chiller merupakan alat pengkondisian udara yang dapat mengkondisikan udara lebih dari satu ruangan untuk satu perangkat AC, karena sistem AC water chlller terdiri dari dua siklus yaitu siklus primer dan siklus sekunder. Pada siklus primer yang bertindak sebagai fluida kerja adalah refrigeran dan pada siklus sekunder yang bertindak sebagai fluida kerja adalah air. Untuk mengetahui penyerapan panas terjadi secara maksimal oleh air dapat dilakukan dengan menganalisa NTU dari sistem water chiller tersebut. Variasi laju aliran volume dilakukan dari 13 ltr/mnt sampai 5 ltr/mnt dengan selisih 0,5 ltr/mnt setiap pengujian. .Dari hasil pengolahan data dan analisa grafik didapat bahwa NTU terbesar yaitu 2,01 dicapai pada laju aliran volume 12 ltr/mnt yaitu sebesar 2,01, kemudian turun dan stabil. Jadi laju aliran volume chilled water berpengaruh terhadap NTU pada sisi FCU dari sistem water chiller. Kata kunci: NTU, laju aliran volume, air pendingin, AC water chiller.

Wasted Heat Engine Utilization in Central AC Condenser Type Water Chiller for Economical Energy Water Heaters I Made Rasta
Jurnal Energi Dan Manufaktur Vol 3, No.2 Oktober 2009
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.964 KB)

Central AC type water chiller is a refrigeration machine that release heat to environment. Heat energy that released to environment comes from room heat load that absorbed by machine and heat from compressor. The best form in using this loss energy is heat recovery water heater technology, where this machine will take heat from condenser by a heat exchanger to heating water. Refrigerant will flow in the heat exchanger before entering condenser, after that refrigerant flow to other components such as, expansion valve, evaporator, compressor and than return again to condenser, this process will be cycling regularly (closed cycle). Based on experimental and analysis result especially for AC with capacity 2 Pk, and tank capacity 75 liter, with water heater recovery device obtained that: (1) Compressor power consumption decrease from 1.66 kW to 1.59kW. (2) Heat rejected from condenser and used by water heater has ratio 4.683 kJ/s and 1.59 kJ/s, with water heater efficiency is 32.2%. (3) Maximum water temperature can be reached are in range 34oC – 47.5oC in 10-150 minutes and flow rate is 0.5 – 2.5 liter /min

Analisis perbandingan performansi mesin pengkondisian udara dengan kompresor terisolasi dan tidak terisolasi I Made Rasta; I Dewa Made Susila
Jurnal Energi Dan Manufaktur Vol 2, No.1 Juni 2007
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (20.139 KB)

During installation of an AC Split, the technician usually didn’t release the compressor insulation. They assumed that the compressor will have longer life time rather than without insulation. Actually, in this case the compressor worked hardly in insulated condition by glass wool. The overload signal then will immediately stop the electric current to the compressor. The research was aimed to investigate the AC performance if compressor in insulated condition and without insulation. The tested unit was AC 2 PK, water chiller type. The result showed, COP decreased 0.35; electrical consumption increased 18.7 Watt; and the refrigerating effect slightly decreased, respectively.

Pengaruh tegangan listrik dan waktu elektroplating Krom keras terhadap ketebalan lapisan Krom I Ketut Suarsana; I Made Rasta; DNK Putra Negara
Jurnal Energi Dan Manufaktur Vol 1, No.2 Desember 2006
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (18.477 KB)

Proses pelapisan Krom merupakan proses akhir atau tahap penyelesaian pada kebanyakan pembuatan komponen agar tidak cepat aus, seperti pada poros, pasak, ring piston, silinder, bearing dan crank shaft. Bahan spesimen yang digunakan adalah Baja St 60 (C 0.40%; Mn 7%; Si 0.28%; P+S 0.09%; Fe 98,53%) dengan variasi tegangan listrik 4 volt, 6 volt, 8 volt, dan variasi waktu elektroplating Krom keras 30 menit, 45 menit, 60 menit. Pengujian yang dilakukan dengan pengukuran ketebalan lapisan menggunakan skala foto mikro dan menghitung ketebalan lapisan permukaan .Dari hasil penelitian ditunjukkan bahwa semakin tinggi tegangan listrik (volt) yang di gunakan dan semakin lama waktu pelapisan Krom keras maka semakin meningkat ketebalan lapisannya. Ketebalan lapisan permukaan yang paling tinggi didapatkan pada tegangan 8 volt dengan waktu pelapisan 60 menit dengan ketebalan lapisannya sebesar 89,37 ?m sedangkan ketebalan lapisan permukaan paling rendah didapat pada tegangan 4 volt dengan waktu pelapisan 30 menit ketebalan lapisannya sebesar 20,18 ?m.

EVALUASI PENGELOLAAN REFRIGERAN CFC, DAN HFC DENGAN MESIN 3R DAN UJI UNJUK KERJA MESIN PENDINGIN STUDI KASUS PADA BENGKEL AC MOBIL DI DENPASAR - BALI I MADE RASTA; I.W. Kasa; I Gede Mahardika
ECOTROPHIC : Jurnal Ilmu Lingkungan (Journal of Environmental Science) Vol 5 No 2
Publisher : Master Program of Environmental Science, Postgraduate Program of Udayana University

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

CFC refrigerant has been known to be one of causes of ozone layer diminishing and HFC is one of green house gases contributing to global warming through the leak and synthetic refrigerant waste to environment. As a response to the ozone layer diminishment on stratosphere, UNEP, in 1981, through a negotiating process of international stages of development reserve the ozone layer through Wina Convention legalized in March 1985. It was then followed up with Montreal Protocol in September 1987 consisting supervision rules on producing, consuming, and treading ozone damaging materials. The government of Indonesia had ratified the convention through President Decree Number 23 Year 1999. The ozone layer reservation program implementation in Indonesia is facilitated by KLH. Governor of Bali issued Decree Number 523/04-B/HK/2010 on membership restructuring of ozone layer reservation and ozone damaging materials control team work in province of Bali. This research was done in 27 car AC service companies or workshop, which received grant of 3R engine in Denpasar, Bali. The research was dominantly focused on monitoring and evaluation, that is how car AC service company or workshop manage CFC/ R-12 and HFC/R-134a refrigerant at service time using 3R engine that refrigerant does not escape to atmostphere. Cooling machine work procedure test (COP) was conducted in laboratory. Research result showed that car AC service company or workshop could manage CFC/ R-12 and HFC /R-l 34a eefctively ( 88,3%). The cooling engine work procedure using CFC /R-12 as the result of 3R engine recovery and recycel resulted in 2,435 while pure CFC/R-12 resulted in 2,54. There were differences in cooling engine work procedure to the use of pure CFC/R-12 refrigerant with that resulted by 3R engine with avarage difference 0,089 or 3,53%.

An Experimental Study on the Ignition Behavior of Blended Fuels Droplets with Crude Coconut Oil and Liquid Metal Catalyst Hendry Y. Nanlohy; Helen Riupassa; I Made Rasta; Masaki Yamaguchi
Automotive Experiences Vol 3 No 2 (2020)
Publisher : Automotive Laboratory of Universitas Muhammadiyah Magelang in collaboration with Association of Indonesian Vocational Educators (AIVE)

This study examines the Ignition characteristics of blended fuel droplets with crude coconut oil and rhodium liquid as a liquid metal catalyst. The ignition behavior was observed by igniting the oil droplet on a junction of a thermocouple, and the droplet evolution recorded with the high-speed camera. The results show that the addition of a liquid metal catalyst successfully reduces the molecular mass of the triglyceride and weakens the bonding force between the carbon chain, and therefore the viscosity and flash point decreases. Moreover, the addition of liquid metal catalysts increased the reactivity of fuel molecules such as C-H, C-C, C = C, and C-O. Changes in the physical properties of the fuel, the geometry of the carbon chain, and molecular mass ease the absorption of heat by the fuel droplet, thereby increasing fuel ignition performances.

ANALISIS EKSPERIMEN LAJU ALIRAN VOLUME AIR TERHADAP TEMPERATUR AIR PANAS PADA HEAT RECOVERY SISTEM AC JENIS WATER CHILLER I Made Rasta
Dinamika Teknik Mesin Vol 1, No 2 (2011): Dinamika Teknik Mesin
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (123.723 KB)

Refrigerant in refrigeration machines will absorb heat from a room space and released the heat to the environment. The heat balancing in the system is heat released from condenser equal with heat absorbed from room space added by the heat equivalent from compressor work. Based on this heat cycle, the writer try to conduct research on using this heat rejection from condenser to heating tap water, focusing on water flow rate increased from 0.5 liter/min to 2.5 liter/min. From experiment and analysis result obtained that the maximum heat water temperature which can be reached is 47.5°C in 0.5 liter/min, with the equipment specifications are 2 HP- split air conditioning and the tank volume is 75 liters. The additional result is heating water temperature is fallen when the water flow rate is increased.

PENINGKATAN PERPINDAHAN PANAS PADA FAN COIL UNIT (FCU) DENGAN NANOPARTI Al2O3 Daud S. Anakottapary; I N Sutarna; Putu Wijaya Sunu; I Made Rasta
JURNAL INTEGRASI Vol 11 No 1 (2019): Jurnal Integrasi - April 2019
Publisher : Politeknik Negeri Batam

Experimental studies on Fan Coil Unit (FCU) were conducted to investigate heat transfer characteristics due to the addition of Al2O3 nanoparticles. The aims of this study was to reveal the phenomenon of nanofluid particle influences on heat transfer performance indicators. This investigation used tube and fin FCU type with cold fluid is water-Al2O3 nanofluid and hot fluid is ambient air. The cold fluid volume flow rate is 15 lpm and the hot fluid mass flow rate is 0.48 kg/s. The concentration of nanoparticles was 0.1%. The ambient air temperature inlet of FCU is 28 ± 0,50C while the cold fluid temperature entering the FCU is 19 ± 0,50C. In this study the performance parameters on cold fluid with nanoparticles were compared with no nanoparticles. The results showed that the small addition of nanoparticles in cold fluid increased heat transfer in FCU by 9.2%.

Pendayagunaan Mata Air Alami Melalui Penerapan Teknologi Kendali Mekanis untuk Air Suci Pura Beji Banjar Pacung-Kediri-Tabanan I Nyoman Suamir; I Made Rasta; I Putu Astawa; Made Ery Arsana
Bhakti Persada Jurnal Aplikasi IPTEKS Vol 6 No 2 (2020): November 2020
Publisher : P3M Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/bp.v6i2.2046

Pengabdian ini bertujuan untuk mengevaluasi penerapan teknologi kendali mekanis untuk air suci Pura Beji di Banjar Pacung, Kediri, Tabanan, Bali. Kondisi pancuran air suci (beji) sangat memprihatinkan, debit airnya kecil. Pura Beji sangat potensial dikembangkan untuk menjadi wisata desa dan memiliki peran sangat strategis bagi masyarakat Hindu dalam menjalankan upacara keagamaan. Sedangkan ke arah hulu sungai dari Pura Beji ada sumber mata air dengan debit yang cukup besar. Dari hasil evaluasi menunjukkan bahwa teknologi yang diterapkan dapat bermanfaat untuk memperbaiki sistem suplai air suci di Pura Beji menjadi lebih bersih dan berkualitas dengan debit suplai yang cukup. Evaluasi terhadap persepsi masyarakat di Banjar Pacung tentang penerapan teknologi juga sudah dilakukan. Hasilnya menunjukkan persepsi masyarakat Banjar Pacung sangat baik dengan skor persepsi kepuasan 4,01 atau sekitar 80,16% masyarakat memiliki persepsi yang sangat baik terhadap teknologi yang telah diterapkan.

UPAYA PELESTARIAN GERABAH TRADISIONAL MELALUI IMPLEMENTASI MESIN GERABAH ERGONOMIS DI DESA KAPAL MENGWI I Ketut Widana; Ni Wayan Sumetri; I Made Rasta
Bhakti Persada Jurnal Aplikasi IPTEKS Vol 5 No 2 (2019): November 2019
Publisher : P3M Politeknik Negeri Bali

The business of traditional pottery, especially carat and coblong, has existed for a long time, said that since Hinduism began to be adopted by the Balinese. Carat is a ceremonial tool that has a design like a jug, only in small form, while coblong resembles a jar. In their use, both are filled with water, supplementing the fire and flowers which are usually always present at every Hindu prayer in Bali. Carat and coblong making technology is fairly traditional and has not been touched by modern technology. The manufacturing process, starting from the treatment of materials, the formation and finishing is done in a conventional way, which uses the feet and hands. The elements of skill and experience play an important role in the realization of carat and coblong pottery products. The aim of the program is to empower craftsmen by giving a touch of modern technology to work tools. The method used is socialization, provision of work tools, testing tools and data retrieval. The testing of the tool was assisted by 7 subjects who volunteered to be involved as testers. Data is taken twice, namely when the subject works using conventional work tools and when using ergonomic or modern work tools. The test results show that by using modern tools, subjects feel the reduction in pain due to work which in the long run will have implications for increasing the productive life of the craftsman and increasing productivity. Kata Kunci : gerabah, alat kerja ergonomis, sakit akibat kerja, produktivitas The business of traditional pottery, especially carat and coblong, has existed for a long time, said that since Hinduism began to be adopted by the Balinese. Carat is a ceremonial tool that has a design like a jug, only in small form, while coblong resembles a jar. In their use, both are filled with water, supplementing the fire and flowers which are usually always present at every Hindu prayer in Bali. Carat and coblong making technology is fairly traditional and has not been touched by modern technology. The manufacturing process, starting from the treatment of materials, the formation and finishing is done in a conventional way, which uses the feet and hands. The elements of skill and experience play an important role in the realization of carat and coblong pottery products. The aim of the program is to empower craftsmen by giving a touch of modern technology to work tools. The method used is socialization, provision of work tools, testing tools and data retrieval. The testing of the tool was assisted by 7 subjects who volunteered to be involved as testers. Data is taken twice, namely when the subject works using conventional work tools and when using ergonomic or modern work tools. The test results show that by using modern tools, subjects feel the reduction in pain due to work which in the long run will have implications for increasing the productive life of the craftsman and increasing productivity. Keywords: earthenware, ergonomic work tools, work-related illness, productivity

Co-Authors Daud Simon Anakottapary Dewa Ngakan Ketut Putra Negara Helen Riupassa Hendry Y. Nanlohy I Dewa Made Susila I Gede Mahardika I Ketut Suarsana I Ketut Widana I N Sutarna I Nyoman Suamir I Putu Astawa I.W. Kasa Made Ery Arsana Masaki Yamaguchi Ni Wayan Sumetri Putu Wijaya Sunu Yamaguchi, Masaki

Title

Found 11 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 11 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 11 Documents
Search