Browsing by Author "Ragadhita, Risti"

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    Feasibility study based on economic perspective of cobalt nanoparticle synthesis with chemical reduction method
    (جامعة الوادي - university of el oued, 2019-02-28) Nandatamadini, Fira; Karina, iSuci; Nandiyanto, Asep Bayu Dani; Ragadhita, Risti
    Cobalt nanoparticle powder is synthesized by a chemical reduction method. In short, it is synthesized through reduction of cobalt ions that are dissolved in aqueous solution by Boronrelated solution with cationic surfactant. Cobalt nanoparticles have many applications, especially in the field of engineering. The successful project for the production of cobalt nanoparticles will produce opportunities that make it possible to advance technology in developing countries. For this reason, a feasibility study for the synthesis of cobalt powder nanoparticles is needed. This project has estimated ideal conditions for worst cases that will occur in production by adding several parameters: raw materials and sales. Evaluation of this feasibility study is using two parameters, which are economic analysis and evaluation techniques, including Gross Profit Margin (GPM), Cumulative Net Present Value (CNPV), Break-Even Point (BEP), Payback Period (PBP) this parameter to show potential profitability for the project. The IRR value of this project that it is not very promising, but all evaluations with various parameters have a positive impact. The project also uses the method of reducing metal salt an easy and the total cost of purchasing relatively inexpensive equipment will provide benefits in the project, and investors will attract this project.
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    Heat exchanger design for the production of synthesized gold nanoparticles
    (جامعة الوادي - university of el oued, 2020-12-10) Erlangga, Thyta Medina Salsabila; Nandiyanto, Bayu Dani; Ragadhita, Risti; Kurniawan, Teguh
    This study aims to develop and analyze the design of heat exchangers in the production of gold nanoparticles (AuNPs) by the biosynthesis method using Sargassum horneri (SH) extract. The simple design of this heat exchanger (HE) uses the shell and tube type, the one-pass tube, and the fluids are water. These specifications pertain to the design of a heat exchanger (HE). The tube length of 4.267 m, shell diameter of 254 mm, outer tube diameter of 22.225 mm, inner tube diameter of 21.184 mm, and wall thickness of 2.1082 mm describe the physical dimensions of the tubes in the heat exchanger. The pitch tube of 31.75 mm refers to the distance between the centers of adjacent tubes in the heat exchanger. Based on manual calculations using Microsoft Excel, the results show that this design has laminar flow as indicated by the Reynolds value. In addition, the HE designs has an effectiveness value of 98.98% with an NTU value of 11.50. In this study, the HE designs results have a high effectiveness value, so it can be considered effective for use in producing gold nanoparticles with SH extract. Therefore, this HE designs analysis can be used as a learning medium in the HE designs process, the operating mechanism, and the performance analysis of the HE.