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Sahat
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Variasi Laju Aliran Air Panas Terhadap Efisiensi Dan Efektifitas Laju Perpindahan Panas Pada Alat Heat Exchanger Tipe Shell And Tube Dengan Aliran Searah Angga Bahri Pratama; Saragi, Jandri Fan HT; Al Qadry; Boangmanalu, Eka Putra Dairi; Sahat; Kadriadi; Fajri, Nural
Jurnal INOVATOR Vol. 6 No. 2 (2023): Jurnal INOVATOR
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/inovator.v6i2.252

Abstract

Heat exchanger merupakan suatu alat yang digunakan dalam proses perpindahan panas suatu fluida ke fluida lain tanpa adanya perpindahan massa dan dapat digunakan sebagai pemanas atau pendingin. Salah satu jenis heat exchanger yang sering digunakan dalam proses industri adalah shell and tube heat exchanger. Fokus penelitian ini adalah menghitung dan menganalisis efisiensi dan efektivitas laju perpindahan panas pada alat penukar panas tipe shell and tube dengan aliran searah. Metode pengumpulan data adalah pengamatan langsung terhadap alat, dengan selang waktu lima menit untuk setiap pengujian. Setelah dilakukan penelitian dan analisis, hasil penelitian ini menunjukkan bahwa pengaruh variasi aliran pada Vh = ±800 l/h, Vc = ±1000 l/h yang dibuat konstan pada tipe shell and tube, dapat disimpulkan semakin besar laju aliran panas maka semakin besar temperatur yang dihasilkan yaitu dengan temperatur 47.7°C, hal ini juga mempengaruhi waktu pengambilan data, dengan efisiensi yang diperoleh sebesar 146% dan efektifitas = 0.50.
Pengaruh Temperatur terhadap Kekuatan Impak Material Baja ST37 dengan Metode Charpy dan Izod Jandri Fan; Sahat; Al Qadry; Eka Putra Dairi Boangmanalu; Angga Bahri Pratama
Jurnal INOVATOR Vol. 6 No. 2 (2023): Jurnal INOVATOR
Publisher : LPPM Politeknik Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37338/inovator.v6i2.254

Abstract

Impact Test can be interpreted as a test that measures the ability of a material to accept impact loads which are measured by the amount of energy required to break the specimen with a swing. The aim of this test is to determine the effect of temperature on the value of energy absorbed by the material and the impact value. The method used in this research is the experimental method, namely the method used to find the effect of temperature on the impact strength of charpy and izod. The results of the charpy and izod impact tests on ST37 Steel specimens prove that there is an influence of temperature on the charpy and izod impact tests. Where the higher the temperature, the higher the energy absorbed and the impact price. Conversely, the lower the temperature, the energy absorbed and the impact price will be lower. In the test results, the lowest energy absorbed in the charpy impact test was 76 J and 22 J in the izod impact test, while the highest energy absorbed in the charpy impact test was 245 J and 114 J in the izod impact test. The lowest impact price in the test was 0.1727 J/mm2 for the charpy impact test and 0.037 J/mm2 for the izod impact test, while the highest impact price in the test was 0.5568 J/mm2 for the charpy impact test and 0.19 J/mm2 for izod impact testing.
Hardness Test Analysis on ST 37 Steel Plate Material and Aluminum Using the Brinell Test Method Sinaga, Franklin Taruyun Hudeardo; Boangmanalu, Eka Putra Dairi; Pratama, Angga Bahri; Saragi, Jandri Fan HT; Al Qadry; Sahat
Formosa Journal of Science and Technology Vol. 2 No. 12 (2023): December 2023
Publisher : PT FORMOSA CENDEKIA GLOBAL

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55927/fjst.v2i12.7035

Abstract

One of the most frequently used methods of material testing is hardness testing. The aim of conducting research on material hardness is to determine the hardness value of the material specimens tested, namely ST 37 steel plate and aluminum plate. The test method is to use the Brinell hardness test where the values ​​obtained during testing are from the force load, indenter diameter and pressure trace diameter and the pressure time that has been determined. By using testing tools such as hardness tester, mechanical caliper, indenter, flat file, stopwatch. And the materials used are ST 37 steel plate, aluminum plate and sandpaper. From the test results obtained we can calculate the Brinell hardness value of the test material. The value from the calculation of test data where the highest hardness value using the Brinell method (BHN) for ST 37 steel plate material is 256.992. Meanwhile, the highest hardness value using the Brinell method (BHN) for aluminum plate material is 55,182.
Penerapan Mesin Screw Press Gambir pada Kelompok Maju Tani di Desa Boangmanalu Kecamatan Salak Kabupaten Pakpak Bharat Jandri Fan HT Saragi; Sahat; Suadi; Nelson Manurung; Sondang Beatrix Siahaan; Angga Bahri Pratama
JURPIKAT (Jurnal Pengabdian Kepada Masyarakat) Vol. 7 No. 1 (2026)
Publisher : Politeknik Piksi Ganesha Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37339/jurpikat.v7i1.2770

Abstract

Pakpak Bharat Regency has great potential in gambier (Uncaria Gambir Roxb.) production, yet low productivity, substandard quality, and limited technology remain major challenges. This community engagement program aimed to improve production capacity and product quality through the implementation of a screw press machine and farmer skill enhancement. The method applied was Participatory Action Research (PAR) involving partners in planning, training, mentoring, and evaluation. Results showed a 15–20% production increase per 100 kg of leaves, reduced moisture content to ≤14%, and more uniform yellowish-brown product quality that meets market standards. Moreover, farmers’ knowledge and skills improved, leading to higher efficiency, increased income, and stronger business independence. This program has a significant impact on farmer empowerment and supports the sustainability of gambier enterprises in Pakpak Bharat.
Design And Build A Double Roll Type Pecan Breaking Machine With A Power Of 0.5 Hp Marslino Simanjuntak, Arion; sahat; Naibaho, winfrontstein
International Journal of Science, Technology & Management Vol. 3 No. 6 (2022): November 2022
Publisher : Publisher Cv. Inara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46729/ijstm.v3i6.680

Abstract

Pecan is one of the spices that become an ingredient in the process of the food and cosmetic industry. The pecan separator machine is made to facilitate and speed up the process of breaking the pecan fruit in order to increase work efficiency in the hope that the machine can achieve high efficiency in the form of good fruit yields. The purpose of this pecan fruit separator machine is to help facilitate the community in processing pecan fruit to the maximum of its production, and the community can also increase the processing productivity of pecan fruit, which can improve the community's economy. The research method applied in this study is an experimental method, namely the initial stage of designing a double roll type pecan breaking machine using Auto CAD. Then build the machine in the workshop based on the design that has been done before. The stages passed are making design drawings in Auto CAD and analyzing the components used in the pecan breaking machine. Such components are the frame, inlet funnel, shaft, breaker roller, bearing and outlet funnel. From the results of the analysis, the motor power is 0.5 HP with a rotation of 1400 rpm. The belt length used from the calculation of the pulley size on the 3" machine and the pulley on the 10 breaking roll is 42". For breaking rollers the outer diameter of the roller = 120 mm, the inner diameter of the roller = 100 mm, and the length of the roller = 190 mm. The shaft on the drive motor is 24 mm in diameter. The shaft isestimated to be of S30C carbon steel with tensile strength = 48 kg/mm².
OPTIMALISASI FRAKSI VOLUME SERAT DAUN NANAS PADA KOMPOSIT EPOKSI BERDASARKAN KEKUATAN TARIK: OPTIMIZATION OF PINEAPPLE LEAF FIBER VOLUME FRACTION IN EPOXY COMPOSITES BASED ON TENSILE STRENGTH Dairi Boangmanalu, Eka Putra; Fan HT Saragi, Jandri; Bahri Pratama, Angga; Sahat; Positron
Atech-i Vol. 3 No. 1 (2025): Tahun 2025
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/atech-i.v3i1.44

Abstract

Penelitian ini bertujuan mengoptimalkan fraksi volume serat daun nanas (Ananas comosus) pada komposit epoksi berdasarkan kekuatan tarik. Serat daun nanas dipilih karena memiliki kekuatan tarik tinggi, densitas rendah, dan ramah lingkungan. Variasi fraksi volume matriks yang digunakan adalah 10%, 20%, dan 30%, dengan pengujian tarik mengikuti standar ASTM D638. Hasil menunjukkan bahwa komposit dengan fraksi matriks 20% menghasilkan kekuatan tarik tertinggi sebesar 34,5 MPa dan modulus elastisitas 1,55 GPa. Peningkatan matriks di atas 20% menurunkan kekuatan tarik akibat berkurangnya fraksi serat efektif. Komposit epoksi–serat daun nanas terbukti potensial sebagai material ringan dan berkelanjutan untuk aplikasi teknik.
Co-Authors Al Qadry Angga Bahri Pratama Boangmanalu, Eka Putra Dairi Dairi Boangmanalu, Eka Putra Eka Putra Dairi Boangmanalu Fajri, Nural Franklin Taruyun Hudeardo Sinaga Jandri Fan Kadriadi Marslino Simanjuntak, Arion Naibaho, Winfrontstein Nelson Manurung Positron Saragi, Jandri Fan HT Sondang Beatrix Siahaan Suadi Zainal