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All Journal Jurnal Rekayasa Mesin Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Fair Value: Jurnal Ilmiah Akuntansi dan Keuangan Jurnal Qua Teknika Jurnal Muara Ilmu Ekonomi dan Bisnis JURPIKAT (Jurnal Pengabdian Kepada Masyarakat) Journal of Applied Computer Science and Technology (JACOST) Jurnal Ekonomi Trisakti Journal of Scientech Research and Development Global Accounting : Jurnal Akuntansi OKTAL : Jurnal Ilmu Komputer dan Sains Reviu Akuntansi, Keuangan, dan Sistem Informasi
Alvin
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Agriculture, Biological Sciences & Forestry Humanities Astronomy Chemistry Computer Science & IT Dentistry Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Mechanical Engineering Public Health Social Sciences

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The Analysis and Evaluation of The Performance of 7 Stage Centrifugal Compressor Apparatus with Variations in Blade Speed and Flow Rate Alvin; Ahmad Khairul Faizin
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6642

Abstract

Centrifugal compressors have an important role in industry because they function to increase gas pressure through the impeller. However, efficiency and power consumption issues frequently arise, particularly under variations in blade speed and flow rate. Previous studies have mostly employed CFD simulations without direct experimental analysis of blade speed and valve opening on actual compressor performance. This study aims to analyze the performance of a seven-stage centrifugal compressor with variations in blade speed and flow rate through experimental methods to obtain efficient operating conditions. The research method involved collecting data three times with variations in blade speed and valve openings of 50%, 75%, and 100%, and analyzing isentropic efficiency based on motor power. The results showed the highest efficiency of 67% occurred at 550 RPM with a 50% valve opening, while efficiency decreased at 100% valve opening across all RPM levels. Motor power consumption increased from 35 Watts at 450 RPM to 280 Watts at 1350 RPM, but the increase in power was not accompanied by an increase in efficiency, especially at high speeds, which led to turbulence and decreased performance. In conclusion, the optimal compressor performance was achieved at medium blade speeds with partial valve openings, resulting in optimal efficiency and power consumption. These findings can serve as a reference for the design and operation of centrifugal compressors to achieve more energy- and cost-efficient performance.
An Inventory Control System to Minimize the Cost of Disposing of Expired Goods in Multi Indah Store Arisandy, Desi; Rudi; Caroline; Reid; Alvin
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 8 No. 1 (2023): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/abdimastalenta.v8i1.10157

Abstract

Multi Indah store is a small business engaged in the sale of shoe raw materials. The customer is a shoemaker. The problem faced by stores today is the process of sorting the shelf life which takes quite a long time so that it has an impact on the slow delivery of goods to customers. The development of an inventory control system using the RAD methodology is a solution offered to stores. The results of the system test found that the sorting process is faster and can help control the amount of inventory, service life, and items that are nearing expiration can be known quickly by shop owners through reports presented by the system.
ANTESEDEN DAN KONSEKUEN PRAKTIK RANTAI PASOK RAMAH LINGKUNGAN PADA PERUSAHAAN SUSU DI INDONESIA Alvin; Wahyuningsih Santosa
Jurnal Ekonomi Trisakti Vol. 3 No. 2 (2023): Oktober
Publisher : Lembaga Penerbit Fakultas EKonomi dan Bisnis 

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25105/jet.v3i2.17400

Abstract

Penelitian ini bertujuan untuk menganalisis Anteseden Dan Konsekuen Praktik Rantai Pasok Ramah Lingkungan Pada Perusahaan Susu Di Indonesia. Penelitian ini menggunakan metode kuantitatif dengan jumlah responden sebanyak 257 responden dengan menggunakan metode purposive sampling. Pengujian hipotesis ini dilakukan dengan metode Structural Equation Model (SEM) dengan bantuan software AMOS. Hasil menunjukan bahwa terdapat pengaruh positif Manajemen Lingkungan Internal terhadap Praktik Rantai Pasok Ramah Lingkungan, terdapat pengaruh positif Kerjasama Dengan Pemangku Kepentingan terhadap Praktik Rantai Pasok Ramah Lingkungan, terdapat pengaruh positif Praktik Rantai Pasok Ramah Lingkungan terhadap Kinerja Lingkungan.
Co-Authors Ahmad Khairul Faizin Arisandy, Desi Caroline Cindy Devilia Putri Efelyn Virginnia Eko Rudiawan Jamzuri Fajar Septian Fajrin Fransiska Soejono Hetty Karunia Tunjungsari Ilianto Tri Sagianto leli honesti Lim, Rico Limgestu M.J. Tyra Nopry Patrick Heaven Reid Rico Limgestu Rudi Rudy Hansen Santosa, Wahyuningsih Wuryan Andayani Yulfis Yulfiswandi, Yulfiswandi