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All Journal Eksergi: Jurnal Teknik Energi
F. Gatot Sumarno
Politeknik Negeri Semarang
Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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Case Study of Heat Transfer on Heater Performance of Injection Molding Machines Before and After Maintenace Mochamad Denny Surindra; Ahmad Hamim Su’udy; Baktiyar Mei Hermawan; Nur Fatowil Aulia; Slamet Priyoatmojo; F. Gatot Sumarno; Gatot Suwoto
Eksergi Vol 18, No 3 (2022): SEPTEMBER 2022
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v18i3.3891

Abstract

Injection molding is a thermoplastic material forming method in which the material melted by heating is injected by a plunger into a water-cooled mold so that it hardens. Molding companies have a classic problem with heaters used to heat plastic ores. One of the companies using the Yizumi UN160SK Injection Molding Machine with polystyrene plastic ore faced a heater malfunction that disrupted the production process.A case study of heater performance was carried out to find out signs of damage, what condition the heater was in (electricity consumption, heat generated and the condition of the plastic ore melt).
Performance Characteristics of Savonius Wind Turbines With Variations Air Gaps in Supporting the Development of Renewable Energy Baktiyar Mei Hermawan; F. Gatot Sumarno; Totok Prasetyo; Sahid Sahid; Anis Roihatin; Nur Fatowil Aulia; M. Denny Surindra; Mulyono Mulyono; Gizella Sofiani; Tania Prameswari Putri; Wahyu Ariyanto
Eksergi Vol 19, No 01 (2023): JANUARY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i01.4252

Abstract

To overcome the occurrence of an energy crisis in the future, an innovation / invention of energy that is environmentally friendly and energy sources will not run out in the future. Energy sources that are environmentally friendly and their potential when developed is very large, one of which is energy sources derived from wind energy. This study aims to determine the effect of wind speed on the performance of wind turbines. To find out the performance characteristics of wind turbines with variations in air gaps. The research method begins with the design / design of the wind turbine, then continues the manufacturing stage, the assembling and installation stage, the testing of tools and analysis, the tests carried out include testing the performance characteristics of the wind turbine. The parameters measured in this study are rotation, torque as well as calculating the kinetic power produced, TSR and CP. The test results conducted showed that the 200 mm air gap Savonius wind turbine with a value of CP = 0.02480-0.15658 had optimum work at low wind speeds (4 m / s). Meanwhile, the 170 mm airborne Savonius wind turbine with a value of CP = 0.00593-0.14668 has optimum work at high wind speeds (8 m / s to 9 m / s). Keywords- wind turbine savonius, air gap, coefficent of power.
Co-Authors . Sahid Ahmad Hamim Su’udy Anis Roihatin Baktiyar Mei Hermawan Gatot Suwoto Gizella Sofiani M. Denny Surindra Mochamad Denny Surindra Mulyono Mulyono Nur Fatowil Aulia Slamet Priyoatmojo Tania Prameswari Putri Totok Prasetyo Wahyu Ariyanto