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All Journal Rekayasa Mesin Mekanika: Majalah Ilmiah Mekanika SEMAR
Rachmanto, Rendy Adhi
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Humanities Education Environmental Science Languange, Linguistic, Communication & Media Mechanical Engineering Social Sciences

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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.
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.
Experimental Test of Ignition Timing with Programable CDI on Performance Single Cylinder Otto Engine Rachmanto, Rendy Adhi; Wijayanto, Martinus Darmawan Bagas; Juwana, Wibawa Endra; Kataraki, Pramodkumar Siddappa
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.58951

Abstract

Ignition timing is sparking from the spark plug based on the ignition angle during the compression stroke in the combustion chamber relative to the piston position and the crankshaft angular speed. Adjusting the ignition angle is one method to optimize the combustion process in the engine. An optimal combustion process can improve engine performance and reduce fuel consumption. This study investigates optimal data from ignition angle changes using a programmable Capacitive Discharge Ignition (CDI). The test was performed on a single-cylinder four-stroke Otto engine with standard ignition angle variations, +3°, +6°, and +9° before Top Dead Centre (TDC). The test results show that torque and power have increased while brake-specific fuel consumption has decreased. Optimal data acquisition at ignition angle of +9° with peak torque value of 6.91 Nm and peak power value of 4.80 kW, while the lowest value of specific fuel consumption is 0.234 kg/kWh, and the highest value of thermal efficiency is 36%. From this study, it was concluded that the ignition timing could affect the engine performance.
Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine Juwana, Wibawa Endra; Rachmanto, Rendy Adhi; Wiyono, Mugi; Istanto, Iwan
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.59487

Abstract

Increasing the compression ratio is an attempt to increase the efficiency and performance of the engine. The purpose of the study was to analyze the effect of changes in the compression ratio on engine performance. Tests using a single-cylinder Otto engine by comparing the performance of an enlarged compression ratio of 9.7:1 and 10.4:1 with a standard compression ratio of 9.0:1. The result of the research is that the compression ratio of 9.7:1 produces a peak torque of 7.51 Nm at 6000 rpm, a peak power of 5.30 kW at 8000 rpm, and the lowest Brake-Specific Fuel Consumption (BSFC) is 0.146 kg/kWh at 6000 rpm. Torque and power increased by 0.09 Nm and 0.28 kW, and Brake-Specific Fuel Consumption (BSFC) decreased by 0.018 kg/kWh compared to the standard compression ratio of 9.0:1. Using a compression ratio of 10.4:1 produces a peak torque of 7.69 Nm at 6000 rpm, a peak power of 5.38 kW at 8000 rpm, and the lowest Brake-Specific Fuel Consumption (BSFC) is 0.116 kg/kWh at 6000 rpm. Torque and power increased by 0.27 Nm and 0.36 kW, and Brake-Specific Fuel Consumption (BSFC) decreased by 0.030 kg/kWh compared to the standard compression ratio of 9.0:1.
PENERAPAN TEKNOLOGI BIOPORI UNTUK MENINGKATKAN KETERSEDIAN AIR TANAH SERTA MENGURANGI SAMPAH ORGANIK DI DESA PURON SUKOHARJO Arifin, Zainal; Tjahjana, Dominicus Danardono Dwi Prija; Rachmanto, Rendy Adhi; Suyitno, Suyitno; Prasetyo, Singgih Dwi; Hadi, Syamsul
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 9, No 2 (2020): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v9i2.43408

Abstract

Ketersediaan air tanah di Desa Puron Kecamatan Bulu Kabupaten Sukoharjo semakin menurun. Hal itu dikarenakan pengambilan air tanah yang tidak diimbangi dengan semangat konservasi dan sedikitnya air hujan yang masuk ke dalam tanah. Berkurangnya jumlah air yang ada mengakibatkan mengeringnya tumbuhan di lingkungan tersebut. Selain itu, masih banyaknya sampah rumah tangga menjadi permasalahan yang harus dihadapi masyarakat permukiman. Penanganan sampah dan irigasi secara konvensional yang telah diterapkan oleh masyarakat belum menjadi solusi terbaik. Sehingga perlu penanganan secara tersistematis, terstruktur dan berkelanjutan. Pengabdian yang dilakukan bertujuan untuk membantu masyarakat Desa Puron dalam menangani masalah air dan sampah. Pengabdian masyarakat dengan mensosialisasikan dan mengajak masyarakat untuk melakukan konservasi sumber daya air dengan penerapan teknologi sederhana dan murah. Penerapan teknologi yang bisa diterapkan yaitu dengan pembuatan lubang resapan biopori untuk meningkatkan jumlah air dalam tanah serta mengurangi sampah organik di Desa Puron. Lubang resapan biopori berfungsi sebagai tempat resapan air ke dalam tanah dan sebagai tempat pembuatan kompos dari sampah organik. Lubang resapan biopori tidak membutuhkan area luas dan proses pembuatannya sangat mudah, hal ini tentu menjadi solusi yang tepat untuk wilayah Desa Puron. Hasil pengabdian menjadikan ketersedian air yang ditandai dengan menghijaunya tumbuhan. Kata kunci: Air, Biopori, Pengabdian, Desa Puron
Implementation of Solar-Powered Water Purification Technology to Enhance Quality of Life in Rural Areas Suyitno, Suyitno; Arifin, Zainal; Tjahyana, Dominicus Danardono Dwi Prija; Juwana, Wibawa Endra; Rachmanto, Rendy Adhi; Yaningsih, Indri
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 13, No 2 (2024): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v13i2.90334

Abstract

This study presents the development and implementation of a solar-powered reverse osmosis (RO) water purification system at Pondok Pesantren Tijarotul Qur’aniyah, Sub-district of Bulu, District of Sukoharjo, Indonesia. The project aimed to provide a sustainable solution to the urgent need for clean drinking water in the community. The implementation process was divided into four main phases: comprehensive survey and needs analysis, prototype development and testing, system implementation, and long-term monitoring and evaluation. The initial survey identified significant issues with water quality and accessibility, leading to the design of a tailored RO system powered by solar energy. The prototype was rigorously tested and adjusted based on user feedback to ensure it met community requirements. The system was implemented on a small scale, involving the construction of necessary infrastructure and integration of solar panels for reliable power. Post-implementation water quality tests showed substantial improvements in key parameters. Results included a pH level of 7.20, hardness (CaCO₃) at 252.87 mg/L, total dissolved solids (TDS) at 0.023 mg/L, and iron (Fe) at 0.2639 mg/L. Chlorine and chromium levels were 0.00 mg/L, manganese (Mn) was 0.1001 mg/L, ammonia (NH₃) was 1.14 mg/L, and sulfate (SO₄) was 11.26 mg/L. All parameters met the quality standards set by the Indonesian Ministry of Health and Government Regulation on Water Quality Management. Continuous monitoring and educational programs were incorporated to ensure local engagement and long-term sustainability. This study demonstrates that the solar-powered RO system effectively meets the community’s need for clean water and offers a scalable model for similar regions, highlighting the potential of combining renewable energy with advanced water purification technologies. Keywords: Water Purification, Reverse Osmosis, Solar Energy, Water Quality, Sustainability
Co-Authors Budi Kristiawan, Budi Danardono Dwi Prija Tjahjana, Dominicus Enoki, Koji Indri Yaningsih Istanto, Iwan Kataraki, Pramodkumar Siddappa Prasojo, Arfi Singgih Singgih Dwi Prasetyo Suyitno Suyitno Syamsul Hadi Tjahyana, Dominicus Danardono Dwi Prija Wibawa Endra Juwana, Wibawa Endra Wijayanta, Agung Tri Wijayanto, Martinus Darmawan Bagas Wiyono, Mugi Zainal Arifin