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All Journal Rekayasa Mesin Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Jurnal Abdikarya : Jurnal Karya Pengabdian Dosen dan Mahasiswa
Budi Kristiawan, Budi
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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.
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.
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.
Drying Characteristics of Pine Wood (Pinus merkusii Jungh. et de Vriese) Using Hot Air, Infrared, and Combined Infrared-Hot Air Chan, Yefri; Himawanto, Dwi Aries; Kristiawan, Budi; Yaningsih, Indri; Erwin, Erwin
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 3 (2025): June 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i3.772-780

Abstract

This research aims to determine the drying characteristics of Merkusii pine wood (Pinus merkusii Jungh. et de Vriese) using three methods, including the hot air drying, infrared, and combined infrared-hot air. The drying characteristics included temperature distribution, reduction in moisture content, drying rate, wood surface temperature distribution, and specific energy consumption (SEC). The results show that the combined infrared-hot air drying method produces a faster drying time and the highest drying rate compared to the only hot air or only infrared drying method. The fastest drying time was 345 min at a treatment temperature of 90°C, air velocity of 3 m/s, and the greatest drying rate was 0.429 gr/min at a temperature of 80°C, air velocity of 3 m/s. Additionally, the combined infrared hot air method produces a more uniform temperature distribution on the wood surface and lower specific energy consumption, specifically 1027.15 MJ/kg. Keywords: Drying, Hot air, Infrared, Temperature.
PENINGKATAN SARANA PENDUKUNG PENGOLAHAN MAKANAN PENDAMPING ASI SEBAGAI UPAYA PREVENTIF PENCEGAHAN STUNTING OLEH KOMINITAS SWEET BABY POKJA 4 TP PKK DESA KECAMATAN WEDI KABUPATEN KLATEN: Improving Supporting Facilities for Processing Complementary Foods for Breast Milk as a Preventive Effort to Prevent Stunting by the Sweet Baby Community, Working Group 4, TP PKK, Wedi District, Klaten Regency Budiana, Eko Prasetya; Hadi, Syamsul; Kristiawan, Budi; Septiyanto, Muhamad Dwi
Jurnal Abdikarya: Jurnal Karya Pengabdian Dosen Dan Mahasiswa Vol. 8 No. 02 (2025): Vol. 08 No. 02 Tahun 2025
Publisher : Lembaga Penelitian Dan Pengabdian Kepada Masyarakat Universitas 17 Agustus 1945 Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30996/.v8i02.11729

Abstract

Stunting merupakan masalah global yang berkembang dan terjadi diberbagai negara belahan dunia. Masalah kesehatan ini merupakan problem fundamental mendasar yang terjadi akibat adanya masalah kekurangan suplai gizi, protein dan lain sebagainya. Masalah tersebut menjadi perhatian khusus bagi Komunitas Sweet Babby Pokja 4 TP PKK Desa Pandes untuk menanggulangi masalah stunting. Kelompok ini memiliki kegiatan yang disebut dengan MP-ASI yaitu kegiatan menyediakan makanan pendukung ASI untuk bayi usia 0-2 tahun di wilayah Desa Pandes Kabupaten Klaten. Selain daripada menanggulangi isu kesehatan stunting komunitas Sweet Baby juga mennghidupkan kehidupan ekonomi dengan mendapatkan keuntungan dari penyediaan MP-ASI dan menerima pesanan makanan konsumsi untuk berbagai acara. Namun kendala yang dihadapi oleh Komunitas adalah penggunaan peralatan yang sederhana rumahan yang sangat terbatas untuk menerima pesanan dalam jumlah yang besar. Oleh sebab itu kegiatan pengabdian yang dilakukan oleh Universitas Sebelas Maret melalui Grub Riset Sustainable Thermofluids melakukan pengabdian ini sebagai bentuk daya dukung terhadap komunitas dan bentuk upaya pelaksanaan kegiatan Tri Dharma Peguruan Tinggi. Kegiatan berjalan dengan baik berupa penyerahan sarana prasarana serta pendampingan tenaga ahli berupa cooking class untuk pelatihan skill dan pengetahuan anggota komunitas tentang olahan makanan bergizi.
Co-Authors Budiana, Eko Prasetya Dwi Aries Himawanto Effendi, Hilbran Tama Dida Enoki, Koji Erwin Erwin Hadi , Syamsul Indri Yaningsih Khoirudin , Ilham Prasojo, Arfi Singgih Rachmanto, Rendy Adhi Septiyanto, Muhamad Dwi Syamsul Hadi Wibawa Endra Juwana, Wibawa Endra Wijayanta, Agung Tri yefri chan