Article Per Year (5 Year)
p-Index From 2021 - 2026
1.203
P-Index
This Author published in this journals
All Journal Jurnal Energi Dan Manufaktur Jurnal Teknosains Matrix : Jurnal Manajemen Teknologi dan Informatika Jurnal Vokasi Madaniya Logic : Jurnal Rancang Bangun Dan Teknologi Jurnal Polimesin
I Gusti Agung Bagus Wirajati
Politeknik Negeri Bali
Religion Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Social Sciences

Published : 9 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 9 Documents
Search

 1 
Experimental Analysis of Volume Flow Rate in Water Chiller Type of Central AC System IGAB Wirajati
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 (271.614 KB)

Abstract

Central AC chilled water system is an air conditioning system that has cooling ability in more than one room. The system has two cycles consist of primary and secondary cycles. When primary cycle works, the refrigerant is used as a working fluid while in the secondary cycle process, 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.
Influence of Fixed Temperature of Chilled Water Outlet Setting toward Performance of Chiller Absorbtion with Two Level Heating Cycle Method I Gusti Agung Bagus Wirajati; Made Sucipta
Jurnal Energi Dan Manufaktur Vol 3, No.1 April 2009
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (178.638 KB)

Abstract

The study investigated the performance of re-heat two stage cycle. This paper presents the working principle and theexperimental results of the reheat two stage adsorption cycle. The performance of the cycle was evaluated under differentheat source temperature and mass recovery time. Coefficient of performance (COP) and cooling capacity have beencalculated to analyze the influences of experimental conditions. The experimental results shown in both COP and coolingcapacity increased along with heat source temperature increased, and mass recovery time is very effective to improve theperformance without increasing heat source temperature.
UNJUK KERJA SISTIM ADSORPSI CHILLER PEMANASAN ULANG DUA TINGKAT I Gusti Agung Bagus Wirajati; A.A.N.Bagus Mulawarman
Matrix : Jurnal Manajemen Teknologi dan Informatika Vol 6 No 3 (2016): MATRIX - Jurnal Manajemen Teknologi dan Informatika
Publisher : Unit Publikasi Ilmiah, P3M Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (260.221 KB)

Abstract

: Adsorpsi refrigerasi chiller adalah sistim pendinginan yang ramah lingkungan karena menggunakan refrigeran alami dan pemanfaatan panas rendah sebagai sumber energinya. Tulisan ini mencakup hasil eksperimen dari sistem adsorpsi chiller pemanasan dua tingkat yang di verifikasi juga dengan simulasi menggunakan program MATLAB dan prinsip kerja dari sistem adsorpsi chiler pemanasan dua tingkat juga dijabarkan dalam tulisan ini. Hasil perhitungan dari COP dan kapasitas pendinginan merupakan indikator unjuk kerja dalam sistem ini. Tujuan dari penelitian ini adalah membandingkan hasil simulasi dan eksperiment dari efek temperatur pemanasan terhadap unjuk kerjanya, terhadap rata-rata keluaran temperatur chiler, terhadap laju aliran masa chiler dan terhadap siklus waktunya. Dari penelitian ini didapatkan kesimpulan bahwa hasil simulasi dan eksperimen menunjukan kecenderungan yang sama dimana nilai COP dan kapasitas pendinginannya naik seiring dengan bertambahnya nilai temperatur pemanasan yang diberikan pada sitim. Disamping itu, diperoleh nilai kapasitas pendinginan yang paling baik untuk siklus waktu diantara 2000 – 2500 detik
Solar Power System Design Applications for Pool Water Pump Operation at Tourist Accomodation I Gusti Agung Bagus Wirajati; I Dewa Made Cipta Santosa; Ida Bagus Aditya Jaya Pramana; I Putu Gede Suka Haryasa; Ida Ayu Gede Bintang Madrini
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 (2189.44 KB) | DOI: 10.31940/logic.v21i3.159-164

Abstract

Utilization of solar energy in Indonesia has begun to bloom. This is due to the fact that Indonesia is located at the equator where the sun is exposed all year round and is a very environmentally friendly energy. Based on this, solar energy is used as an option to meet electricity needs by using a photovoltaic (PV) system. The use of a photovoltaic system as a power provider to operate a pool water pump at a villa in Bali is an example of the application of a photovoltaic system. In this study, A Seri and Parallel photovoltaic arrays were used with a panel system that was integrated with PLN electricity. The angle of inclination and direction of placement chosen in this study is 15° with facing north, which refers to research that, has been done previously. PV designs and a series of control panels that can be accessed via the internet will be described as well. The aim in this research is investigate how photovoltaic design used as a solar power plant which applied to the module can be runing the pool water pump in the villa or tourist accommodation.
Analysis of Display Cabinet Design with Commissioning Test for Fresh Sea Food I Dewa Made Cipta Santosa; I Gede Nyoman Suta Waisnawa; I Gusti Agung Bagus Wirajati; I Gede Thio Cahya Dinata; I Komang Raditya Cahya Dinata
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 (2873.835 KB) | DOI: 10.31940/logic.v21i3.190-196

Abstract

This research is a design of a display cabinet cooling system with integrated energy from PLN electricity and solar power. This equipment is used for displaying marine fish and other fresh sea food in restaurants or cafes in support of Balinese culinary specialties, namely grilled fish and seafood which are very well known and can be a very extraordinary carrying capacity for Bali tourism. This cooling system is designed to be able to maintain the temperature of the cooling room (cabin) up to -5 oC. This is in accordance with the standards for storing fresh sea fish and sea food in a temperature range of -2oC to 2oC, where fish and sea food are still in a very fresh condition for an average of 1 week. Other standards to maintain product freshness also require room humidity between RH 90% – RH 95%. Furthermore, data collection on system performance is carried out using the commissioning test method to determine the initial performance achievement of the tool so that its shortcomings can be evaluated which will be developed and corrected in further research. From the research, it is found that the temperature achievement is very good, the solar and PLN integration system with the Automatic Transfer Switch (ATS) control system has also worked well where the switch occurs when the battery charging condition is below 30% or below 10V. However, something that has not been achieved is the humidity in this system, the average relative humidity (RH) is 50% so that the final condition of the product becomes dry on the surface of the fish. This relatively low humidity is due to the fact that it still relies on the humidity increase system by opening the cooler cabin door. In the next development, the right humidifier system will be designed for this display cabinet system.
Optimasi unjuk kerja pada sistem pendinginan adsorpsi dengan siklus pemanasan-ulang kombinasi I Gusti Agung Bagus Wirajati; Putu Wijaya Sunu; Ida Ayu Gede Bintang Madrini; Ni Kadek Muliati
Jurnal Teknosains Vol 12, No 1 (2022): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.73676

Abstract

The adsorption refrigeration system is a cooling system that offers several benefits, including being environmentally friendly due to the very small amount of global warming effect given, the lack of potential for ozone depletion, the low energy consumption of its operation, the low heat source used in its operation and good for reducing gas emissions on earth. This paper describes a combined reheating adsorption refrigeration system with three heat exchangers, as well as operating modes. The operation of the adsorption refrigeration system with combined reheating is schematically described with operational modes and diagrams. This adsorption cooling system is made up of three heat exchangers (H), one evaporator, and one condenser. The combination cycle is intended for heat exchanger systems that operate in a reheat cycle (H1 and H2) and a non-reheating cycle (H3). This paper also discusses system cycle time optimization. Research to get the optimum value of cycle time in this system is still rarely done and therefore optimization of cycle time is carried out on the system to get the best performance. The PSO (particle swarm optimization) program is paired with the MATLAB program to simulate the performance of the system under discussion while also enhancing its performance. The goal of this work is to use simulation to determine the optimal system performance versus the overall cycle time, which includes adsorption/desorption time, pre-cooling and pre-heating time as well as mass recovery time. Getting the best value for the entire cycle time is made possible by fusing the simulation of the system's process performance with performance optimization. As a results, the greatest increase in the optimization results' performance value occurs at a heat source temperature of 55ºC with a longer time to achieve optimal performance.
Revitalisasi Sistem Penerapan K3 dalam Layanan Upacara Adat Banjar Jeroan, Patemon Singaraja dengan Pemanfaatan Kompor Gas dan Chafing Dish I Gusti Agung Bagus Wirajati; Luh Putu Ike Midiani; Made Ery Arsana
Madaniya Vol. 4 No. 3 (2023)
Publisher : Pusat Studi Bahasa dan Publikasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53696/27214834.494

Abstract

Kegiatan PkM ini bertujuan untuk menganalisis implementasi Keselamatan dan Kesehatan Kerja (K3) dalam layanan upacara adat Banjar Jeroan di Patemon Singaraja dengan pemanfaatan kompor gas dan chafing dish. Metode yang digunakan adalah observasi dan wawancara dengan pengelola layanan upacara adat Banjar Jeroan, serta pengguna layanan. Hasil PkM menunjukkan bahwa implementasi K3 dalam layanan upacara adat Banjar Jeroan telah dilakukan dengan baik dengan menggunakan kompor gas dan chafing dish yang aman dan sesuai standar. Selain itu, penggunaan alat pelindung diri seperti sarung tangan dan masker juga diterapkan oleh pengelola layanan. Meskipun demikian, masih ditemukan beberapa kekurangan dalam implementasi K3, seperti kurangnya sosialisasi kepada pengguna layanan mengenai penggunaan alat pelindung diri dan cara penggunaan kompor gas dan chafing dish yang benar. Oleh karena itu, disarankan agar pengelola layanan melakukan sosialisasi secara intensif kepada pengguna layanan tentang pentingnya K3 dalam upacara adat Banjar Jeroan, serta memberikan edukasi mengenai cara penggunaan alat pelindung diri dan alat masak yang benar. Diharapkan PkM ini dapat memberikan kontribusi bagi pengelola layanan upacara adat Banjar Jeroan dalam meningkatkan implementasi K3 dalam layanan mereka.
Real-time thermodynamic monitoring of split inverter ACs: amicrocontroller-driven investigation of performance I Gede Artha Negara; Adi Winarta; Putu Wijaya Sunu; I Dewa Made Cipta Santosa; I Nyoman Suamir; I Gusti Agung Bagus Wirajati; I Dewa Gede Agus Tri Putra
Jurnal Polimesin Vol 22, No 2 (2024): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i2.4178

Abstract

Recent technological advancements, particularly in air conditioning cooling systems, have led to rapid developments such as inverter technology. Inverter technology provides various advantages including energy savings compared to non-inverter air conditioners. Globally, the inverter modulates the compressor to continue operation despite reaching the set temperature. This study aimed to monitor the performance of split inverter air conditioners utilizing microcontroller technology. The microcontroller model employed was the ATmega2560, capable of logging each test parameter and displaying in real-time. Additionally, the ATmega2560 integrated sensors including the DS18B20 temperature sensor and PZEM 004-T multifunction electrical sensor. Monitoring occurred over one hour of operation on a 8525 Btu/h capacity split inverter AC. Experimental monitoring results showed the lowest Tsupply at T1 compared to other temperatures, reaching 8°C. At Treturn, both T1 and T2 exhibited identical decreasing trends to 25.5°C around 3000 s. The minimum power variation occurred at P5 relative to other variations. The average power consumption of the split inverter AC was approximately 750 W. The minimum energy consumption observed was at E5 during the study, while the maximum was at E1 with peak energy consumption of 0.96 kWh. Microcontroller-based experimental monitoring can provide real-time results and shows promise for monitoring split inverter AC performance.
PKM PENGGUNAAN LAMPU PENERANGAN JALAN TENAGA SURYA UNTUK MENDUKUNG KAWASAN WISATA EDUKASI SUBAK TEBA MAJELANGU DESA KESIMAN KERTALANGU Midiani, Luh Putu Ike; Wirajati, I Gusti Agung Bagus; Arsana, Made Ery
Jurnal Vokasi Vol 7, No 3 (2023): November
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/vokasi.v7i3.4580

Abstract

Kawasan Wisata Subak Teba Majelangu di Desa Kesiman Kertalangu terletak di wilayah dengan keterbatasan jaringan listrik. Minimnya pencahayaan di jalan-jalan daerah ini mengakibatkan terganggunya kenyamanan dan keamanan dalam beraktivitas, terutama saat sore menjelang malam hari. Berdasarkan kondisi tersebut tim pengabdian dari Prodi Teknologi Rekayasa Utilitas Jurusan Teknik Mesin Politeknik Negeri Bali melakukan Pengabdian kepada Masyarakat (PkM) dengan menyediakan lampu penerangan jalan tenaga surya di kawasan Wisata Edukasi Subak Teba Majelangu. Kegiatan PkM melewati serangkaian tahapan sebagai berikut : 1) analisis situasi, 2) penentuan kebutuhan daya lampu, 3) persiapan peralatan, 4) instalasi dan pemeliharaan, 5) evaluasi dan monitoring. Hasil yang dicapai adalah pemasangan lampu penerangan jalan tenaga surya di kawasan Wisata Edukasi Subak Teba Majelangu Desa Kesiman Kertalangu, yang mampu memberikan penerangan yang memadai di malam hari untuk jalan dan area sekitarnya, serta memiliki durasi pencahayaan yang panjang. Pemasangan lampu penerangan jalan tenaga surya merupakan implementasi penggunaan energi terbarukan dalam upaya pelestarian lingkungan..
Co-Authors Adi Winarta Anak Agung Ngurah Bagus Mulawarman I Dewa Gede Agus Tri Putra I Dewa Made Cipta Santosa I Gede Nyoman Suta Waisnawa I Gede Thio Cahya Dinata I Komang Raditya Cahya Dinata I Nyoman Suamir I Putu Gede Suka Haryasa Ida Ayu Gede Bintang Madrini Ida Bagus Aditya Jaya Pramana Luh Putu Ike Midiani Made Ery Arsana Made Sucipta Negara, I Gede Artha Ni Kadek Muliati Putu Wijaya Sunu