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Jurnal Mekanik Terapan
Published by Politeknik Negeri Jakarta
ISSN : -     EISSN : 27471381     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Jurnal Mekanik Terapan (JMT) adalah jurnal ilmiah yang terbit secara berkala dua kali setahun pada bulan Mei dan Oktober. Jurnal ini dapat digunakan sebagai sumber informasi ilmiah untuk peneliti, akademisi atau lembaga penelitian, insinyur industri, dan lembaga pemerintah. JMT memuat informasi bidang riset Mekanik Terapan berupa hasil riset dan Ulasan Ilmiah pada bidang: -Teknik Mesin dan Manufaktur -Energi (Konversi Energi, Renewable Energy, Applied Chemistry in Energy) -Mekatronika dan Robotika -Otomotif (Alat Berat dan Kendaraan Ringan) -Material dan Metalurgi -Teknik Pembangkit Tenaga Listrik
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 144 Documents
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Evaluation of Cooling Tower Performance Based on Range, Approach and Effectiveness Parameters on Geothermal Power Plant Turbine Performance Fitri Wijayanti; Muhammad Ridho Kurnia; Paulus Sukusno
Jurnal Mekanik Terapan Vol 7 No 2 (2026): August 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v7i2.8724

Abstract

This study evaluates the thermal performance of the cooling tower at PT. Geo Dipa Energi Unit Patuha, a 60 MW single-flash geothermal power plant, using cooling-water temperature range, approach, and effectiveness, and examines their statistical relationships with condenser pressure and turbine output power. Operational data were obtained from the plant Distributed Control System (DCS) at two-hour intervals during January–June 2026. After validation, 1,090 of 1,104 records (98.8%) were retained. The cooling-water temperature range, defined as the difference between return and supply temperatures, remained relatively stable (mean 24.65°C, SD 0.24°C). Because range is a temperature difference, it is not itself a measure of heat-rejection rate; the latter requires cooling-water mass flow rate and specific heat according to Q̇ = ṁCp(T1−T2). The approach ranged from 2.38°C to 12.33°C and effectiveness from 66.43% to 91.15%. Wet-bulb temperature was positively associated with cooling-water supply temperature (r = 0.704). Cooling-water supply temperature showed a very strong association with condenser pressure (r = 0.975, R² = 0.951; Vacuum = 5.76T2 − 20.33), while condenser pressure was negatively associated with turbine output power (r = −0.716, R² = 0.512), with an estimated 0.0723 MW decrease per 1 mbara increase. These observational results indicate that absolute cooling-water supply temperature is more directly associated with turbine output than effectiveness alone. The findings should be interpreted as statistical associations rather than causal effects because steam flow, inlet steam conditions, plant load, humidity, fouling, and other operational factors were not simultaneously controlled in the simple regression models.
Innovation in Truck Air Filter Cleaning: Effectiveness and Development of an Electric Motor-Based System Sugiyarto; Rahmat Noval; Edy Ismail; Hana Yulia Siska; Siti Widyawati; Wildan Ma’wa Riski; Rahmat Hari Prasetya
Jurnal Mekanik Terapan Vol 7 No 2 (2026): August 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v7i2.8737

Abstract

Manual cleaning of truck air filters in workshops is time-consuming, reduces work efficiency, and may expose technicians to fine dust. However, practical and affordable electric motor-based cleaning tools specifically designed for truck workshops remain limited. This study aimed to design and develop a practical electric motor-based air filter cleaning tool suitable for truck repair workshops, and evaluate and compare the cleaning time of the developed tool at three motor rotation speeds (800, 1000, and 1200 RPM) with the conventional manual cleaning method. The results showed that the average cleaning time was 6.99 minutes for the manual method, 5.21 minutes at 800 RPM, 4.94 minutes at 1000 RPM, and 5.09 minutes at 1200 RPM. The 1000 RPM setting produced the shortest cleaning time and achieved a 27.46% reduction in cleaning time compared with the manual method. Therefore, the developed electric motor-based air filter cleaning tool demonstrates potential to improve cleaning efficiency for truck air filter maintenance. The results indicate that the developed electric motor-based air filter cleaning tool can reduce cleaning time compared with the conventional manual method, with 1000 RPM producing the shortest average cleaning time among the tested speeds.
Design and Fabrication of Die and Punch Components for the Piercing-Coining Process of AA 1100-O Aluminum Plate Muhammad Khafidz Maulana; Dhiya Luqyana; Nugroho Eko Setijogiarto; Rafiel Syafa Budihardjo
Jurnal Mekanik Terapan Vol 7 No 2 (2026): August 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v7i2.8796

Abstract

The preparation of aluminium workpieces for anodizing at Jakarta State Polytechnic is currently performed manually using a hacksaw and metal file, resulting in a production time of more than 60 min/workpiece. This study focuses on the design and fabrication of punch and die components for an existing die machine by applying the Quality Function Deployment (QFD). User needs were identified through observation, interviews, and questionnaires, and subsequently translated into engineering specifications using the House of Quality (HoQ). Based on the design analysis, a die clearance of 0.21 mm and a required pressing force of 3 tons were determined. The fabricated punch and die components were then evaluated through trial production of aluminium specimens. The experimental result demonstrated that the developed tooling was successfully integrated into the die system and produced workpieces with consistent dimensions and satisfactory accuracy. In addition, the proposed system substantially improved production efficiency, increasing the production capacity from approximately one workpiece/hour using the conventional manual process to 240 workpieces/hour, assuming continuous machine operation without downtime. The proposed approach demonstrates the potential of integrating industrial press tooling into vocational laboratory applications to improve the efficiency and consistency of practical workpiece preparation. Furthermore, this approach can serve as a scalable model for implementing low-cost manufacturing technologies in vocational education.
Analysis of the Effect of Sootblowers on Superheater Heat Transfer Rates in Units 2 and 3 of the Indramayu Steam Power Plant (PLTU) Ardi Wibowo; Paulus Sukusno; Candra Damis Widiawaty
Jurnal Mekanik Terapan Vol 7 No 2 (2026): August 2026
Publisher : Politeknik Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32722/jmt.v7i2.8843

Abstract

Coal ash fouling on boiler superheater tubes causes a reduction in power plant thermal efficiency. This study analyzes the effect of sootblower operation on the heat transfer rate (Q) of Unit 2 and Unit 3 superheaters at Indramayu Power Plant. Secondary data from the Distributed Control System (DCS) were collected for 9 hours before and 9 hours after sootblowing under stable load conditions. The value of Q was calculated using Q = ṁ(hout − hin) with enthalpy values from IAPWS-IF97 steam tables. Results show that average Q for Unit 2 increased from 83.24 MW to 89.80 MW (a 7.88% rise) with a 7.37°C increase in outlet steam temperature. For Unit 3, average Q increased from 80.27 MW to 89.93 MW (a 12.03% rise) with a 10.98°C temperature increase. For the single sootblowing cycle observed in each unit, sootblower operation was associated with a clear increase in superheater heat transfer rate, indicating its potential as a reference for evaluating boiler cleaning schedules.

Page 15 of 15 | Total Record : 144

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