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All Journal Rotasi Jurnal Teknik ITS Dinamika Teknik Mesin Journal of Science and Applicative Technology Journal of Renewable Energy and Mechanics
Devia Gahana Cindi Alfian
Department Of Mechanical Engineering, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Desa Way Hui, Kecamatan Jatiagung, Lampung Selatan, Indonesia 35365
Automotive Engineering Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Journal : Rotasi

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Heat Transfer Characteristics of Hybrid Nanofluids Al2O3/ZnO as Working Fluid in Electronic Cooling Systems Devia Gahana Cindi Alfian
ROTASI Vol 24, No 4 (2022): VOLUME 24, NOMOR 4, OKTOBER 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.4.65-71

Abstract

The use of nanofluid as a working fluid to improve equipment performance has been growing recently. Utilization of nanofluid hybrids is the development of mono nanofluid to improve heat transfer performance which is still not maximized when using mono nanofluid. This research was conducted to determine the performance of hybrid nanofluids with composition of Al2O3/ZnO-Distilled Water as working fluids in electronic devices. The process of making hybrid nanofluids was carried out using a two-step method using an ultrasonic cleaner for 3 hours. Furthermore, the test was carried out by varying the ratio of Al2O3 and ZnO nanoparticles at 25%:75%, 50%:50%, 75%:25% at exactly 0.5% volume fraction. Based on the test results, adding nanoparticles can increase the heat transfer in the working fluid. The use of nanofluid hybrids at varying ratios of Al2O3:ZnO (50%:50%) with a flow rate of 0.7 L/min has the highest heat transfer coefficient value of 220.14 W/m2.oC at Reynolds Number 178.4 and requires pumping power of 0.649 W. Moreover, distilled water with a flow rate of 0.7 L/min has the heat transfer coefficient of 77.48 W/m2.oC at Reynolds Number 130.1 and requires a pump power of 0.425 W.
The Effect of Pressure Variations on the Characteristics of Coconut Shell Based Briquettes Using Tapioca Starch Adhesive Devia Gahana Cindi Alfian; Marone J Tambunan; Fajar Paundra; Dicky J Silitonga; Lathifa Putri A; Muhammad Syaukani
ROTASI Vol 25, No 3 (2023): VOLUME 25, NOMOR 3, JULI 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.3.23-32

Abstract

The very limited availability of energy on this planet is one of the main problems that concerns almost all countries. The presence of emergency energy indicates that energy usage is very high. Therefore, encouraging the use of new and sustainable energy sources is of utmost importance. Biomass energy can be the answer to overcoming the limitations of decreasing fossil assets, especially through the production of charcoal briquettes. Biomass energy is derived from plants or easily traceable natural materials that are abundant, such as wood waste, rice husks, bagasse, and coconut shells. Coconut shells, for example, can be a primary ingredient for making charcoal briquettes, using tapioca flour or starch as an adhesive. The briquettes can be produced using pressure variations of 50 kg/cm², 60 kg/cm², and 70 kg/cm², with a drying temperature of 100°C for 3 hours. The recommended ratio for making charcoal briquettes is 3 parts coconut shell to 1 parts tapioca flour adhesive. The purpose of this study is to compare the briquettes produced with coconut shell and tapioca flour adhesive to the SNI Briquette standard No.1/6235/2000. For the conducted tests, the results were as follows: the water content was 6.06%, the ash content was 5.9695%, the carbon content was 43.5946%, and the calorific value was 34,182.6808 calories. Additionally, the substance score yield was 26.845%, and the combustion rate was 0.12179 g/minute.
Co-Authors Abdul Muhyi Dian Fajarika, Dian Dicky J. Silitonga Didik Supriyadi Djatmiko Ichsani F. Oktaberi F.M.Al Machzumy Fajar Paundra Fajar Perdana Nurullah L. Triawan Lathifa Putri A Lathifa Putri Afisna Marone J Tambunan Mika Margareta Muhammad Syaukani Rico Aditia Prahmana Rinda Gusvita Rizky Faesal Sadikin Theodorus Rendy Prasetya