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All Journal International Journal of Renewable Energy Development Rekayasa Mesin REKAYASA
Wijayanta, Agung Tri
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Agriculture, Biological Sciences & Forestry Chemistry Computer Science & IT Electrical & Electronics Engineering Energy Engineering Mechanical Engineering Physics

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SIMULATION-BASED ASSESSMENT KINERJA TERMAL PADA CONCENTRIC TUBE HEAT EXCHANGER Kristiawan, Budi; Wijayanta, Agung Tri; Juwana, Wibawa Endra; Rachmanto, Rendy Adhi; Enoki, Koji; Prasojo, Arfi Singgih
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1372

Abstract

The double-pipe heat exchanger is one of the most popular heat exchanger devices. In this study, the concentric tube heat exchanger as the double pipe heat exchanger device was simulated with ANSYS code FLUENT. The simulation was done by based on the Reynolds number variation from 400010.000 using the method of co-current and counter flow. The hydrodynamic and thermal simulation results agree with the empirical correlation of the Pethukov and Dittus-Bolter equations, respectively. The friction factors of the water base fluid and nanofluid f TiO2/water f (0.1 vol.%) do not result in a significant difference in the turbulent flow regime for both co-current and counter flow. The thermal performance of TiO2/water (0.1% vol) nanofluid as indicated by the value of the heat transfer coefficient results in an increase of 6.9% for counter low flow and 6.0% for co-current flow. Meanwhile, the direction of fluid flow in the heat exchanger does not have a significant effect on its thermal performance.
Screen printed carbon electrode from coconut shell char for lead ions detection Heliani, Kinkind Raras; Rahmawati, Fitria; Wijayanta, Agung Tri
International Journal of Renewable Energy Development Vol 13, No 1 (2024): January 2024
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2024.57679

Abstract

This research aimed to produce a screen-printed carbon electrode (SPCE) from an activated coconut shell carbon. As a raw material, coconut shell char provides renewability and is abundantly available in the market. Meanwhile, SPCE offers a simple electroanalytical electrode because the working, counter, and reference electrodes are in one piece. The coconut shell carbon was activated by steam at 700 oC for 1h, producing AC700 that was then characterized to ensure the result by following per under carbon as the main component, the phases, crystal structure, surface area, morphology, and elemental content. The result showed that the surface area of AC700 is 816 m2/g, and the surface structure is porous, as identified by SEM images. Impedance analysis followed by data fitting and conductivity calculation found a high conductivity of 8.68 x 10-2 Scm‑1. The produced-SPCE or SPAC700 was modified by ferrocene at various compositions of 10%; 20%; and 30% of mass. The SPAC700-Fc30 provided the best performance for lead analysis with a detection limit of 0.35 mM, a quantitation limit of 1.17 mM, and good reproducibility with a Repeatability Coefficient (RC) of 0.022. SPAC700-Fc30 showed good lead ions detection despite under 10% Cu2+ and 10% Co2+ interferences. The result confirmed the potential use of coconut shell char as the raw material for SPCE production.
STUDI EKSPERIMEN PENINGKATAN PERPINDAHAN KALOR FLUIDA NANO CuO /AIR PADA VERTICAL HELICAL MICROFIN TUBE Kristiawan, Budi; Khoirudin , Ilham; Wijayanta, Agung Tri; Hadi , Syamsul; Effendi, Hilbran Tama Dida
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1715

Abstract

The way to increase heat transfer is to use nanofluids and expand the heat transfer area. This research studied the thermal performance, convection heat change coefficient, and pressure drop in a double pipe heat exchanger experimentally in a vertically arranged helical microfin tube heat exchanger. Hot water flows on the side of the annulus. In contrast, nanofluid CuO/distilled water concentration of 0.05 vol% flows laminarly in the inner pipe of the microfin tube with cross-flow and parallel-flow arrangements. The result is convection heat transfer coefficient enhancement and thermal performance factor compared to the base fluid. Counter flow improves heat transfer better than parallel flow. This research contributes to the use of helical microfin and nanofluids to increase heat transfer in heat exchangers used in industrial processes.
Modeling of conventional single slope solar still (CS4) with phase change material (PCM) Santosa, Irfan; Dwi Septiyanto, Muhamad; Andriyanto, Sholikhin; Budiana, Eko Prasetya Budiana; Hadi, Syamsul; Wijayanta, Agung Tri
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.29386

Abstract

This study investigates the capability of two-dimensional Computational Fluid Dynamics (CFD) simulation to estimate the temperature distribution pattern and velocity contours in a single slope solar still that uses soybean wax as a phase change material (PCM). A triangular mesh model is employed in the simulation. The basin geometry uses a mesh with 20,402 nodes and 10,000 elements, while the PCM geometry uses a mesh consisting of 9,272 nodes and 4,500 elements. This study introduces an equation developed based on the Dunkle, Bulk Motion, and Chilton-Colburn analogies to estimate the Nusselt number in the solar still. The water temperature (Tw), the inner surface temperature of the glass cover (Tg), and the PCM temperature (Tpcm) are determined experimentally, whereas the performance of the conventional solar distillation system is predicted theoretically using the experimental results. The results demonstrate that the use of soybean wax as a PCM positively influences the temperature distribution and streamline patterns within the single slope solar still. In the morning, the temperature and velocity distributions reveal that the isotherm lines are parallel to the lower right segment of the cavity, indicating that conduction is the dominant heat transfer mechanism. As the day progresses, the streamline pattern inside the cavity expands and becomes more curved, suggesting an increased influence of the convection process. These findings are consistent with the CFD analysis results, which show high accuracy in predicting Nusselt numbers. Furthermore, the comparison between daily distilled water productivity from experimental measurements and theoretical predictions shows good agreement.
SIMULATION-BASED ASSESSMENT KINERJA TERMAL PADA CONCENTRIC TUBE HEAT EXCHANGER Kristiawan, Budi; Wijayanta, Agung Tri; Juwana, Wibawa Endra; Rachmanto, Rendy Adhi; Enoki, Koji; Prasojo, Arfi Singgih
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1372

Abstract

The double-pipe heat exchanger is one of the most popular heat exchanger devices. In this study, the concentric tube heat exchanger as the double pipe heat exchanger device was simulated with ANSYS code FLUENT. The simulation was done by based on the Reynolds number variation from 400010.000 using the method of co-current and counter flow. The hydrodynamic and thermal simulation results agree with the empirical correlation of the Pethukov and Dittus-Bolter equations, respectively. The friction factors of the water base fluid and nanofluid f TiO2/water f (0.1 vol.%) do not result in a significant difference in the turbulent flow regime for both co-current and counter flow. The thermal performance of TiO2/water (0.1% vol) nanofluid as indicated by the value of the heat transfer coefficient results in an increase of 6.9% for counter low flow and 6.0% for co-current flow. Meanwhile, the direction of fluid flow in the heat exchanger does not have a significant effect on its thermal performance.
STUDI EKSPERIMEN PENINGKATAN PERPINDAHAN KALOR FLUIDA NANO CuO /AIR PADA VERTICAL HELICAL MICROFIN TUBE Kristiawan, Budi; Khoirudin , Ilham; Wijayanta, Agung Tri; Hadi , Syamsul; Effendi, Hilbran Tama Dida
Jurnal Rekayasa Mesin Vol. 15 No. 3 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i3.1715

Abstract

The way to increase heat transfer is to use nanofluids and expand the heat transfer area. This research studied the thermal performance, convection heat change coefficient, and pressure drop in a double pipe heat exchanger experimentally in a vertically arranged helical microfin tube heat exchanger. Hot water flows on the side of the annulus. In contrast, nanofluid CuO/distilled water concentration of 0.05 vol% flows laminarly in the inner pipe of the microfin tube with cross-flow and parallel-flow arrangements. The result is convection heat transfer coefficient enhancement and thermal performance factor compared to the base fluid. Counter flow improves heat transfer better than parallel flow. This research contributes to the use of helical microfin and nanofluids to increase heat transfer in heat exchangers used in industrial processes.
Co-Authors Andriyanto, Sholikhin Budi Kristiawan, Budi Budiana, Eko Prasetya Budiana Dwi Septiyanto, Muhamad Effendi, Hilbran Tama Dida Enoki, Koji Fitria Rahmawati Hadi , Syamsul Heliani, Kinkind Raras Irfan Santosa Khoirudin , Ilham Prasojo, Arfi Singgih Rachmanto, Rendy Adhi Syamsul Hadi Wibawa Endra Juwana, Wibawa Endra