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All Journal Jurnal Rekayasa Mesin Eksergi: Jurnal Teknik Energi Jurnal Polimesin
F. Gatot Sumarno, F. Gatot
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Karakterisasi Alat Pengering Tipe Kabinet Berbahan Bakar Liquefied Petrolium Gas (LPG) Dengan Penambahan Low Cost Material Heat Storage (LCMHS) Apriandi, Nanang; Sumarno, F. Gatot; An-Nizhami, Avicenna; Luthfiana, Nadia Tasya Ayu; Kholifah, Nevita Nur; A’tohillah, Muhammad Khusnul; Prakoso, Raden Gumilang Aji
Jurnal Rekayasa Mesin Vol 17, No 2 (2022): Volume 17, Nomor 2, Agustus 2022
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v17i2.3690

Abstract

Efektifitas kerja alat pengering utamanya mempersyaratkan temperatur ruang pengering tinggi, kelembaban udara relatif (RH) rendah dan hemat energi. Salah satu upaya peningkatan efektifitas kerja alat pengering adalah dengan penambahan heat storage. Umumnya, material heat storage yang digunakan adalah material komersil dengan harga yang relatif mahal dan ketersediaanya tidak merata di setiap daerah. Diperlukan material heat storage alternatif yang murah dan mudah ditemukan, salah satunya adalah limbah gram besi proses permesinan. Makalah ini mengeksplorasi low cost material heat storage (LCMHS) yang diintegrasikan ke dalam alat pengering tipe kabinet berbahan bakar liquefied petrolium gas (LPG) dengan memanfaatkan limbah gram besi praktikum permesinan di Jurusan Teknik Mesin, Politeknik Negeri Semarang sebagai material heat storage. Tujuan dari penelitian ini adalah untuk melakukan karakterisasi terhadap alat pengering dengan penambahan material heat storage berbasis limbah gram besi pada ruang plenum, dimana karakterisasi alat pengering melibatkan distribusi temperatur di ruang plenum, distribusi temperatur di ruang pengering, dan ditribusi kelembaban udara relatif (RH) di ruang pengering, dengan memvariasikan massa limbah gram besi 3,5 kg, 6,5 kg, dan 9,5 kg. Hasilnya, temperatur rata-rata di ruang plenum berturut-turut adalah 72,08°C, 87,2°C, dan 99,53°C, dengan temperatur tertinggi di ruang pengeringan yaitu 51,26°C pada massa gram besi 3,5 kg dan RH terendah 24,1% dengan massa gram besi 9,5 kg. Secara keseluruhan, limbah gram besi praktikum permesinan dapat digunakan sebagai alternatif material heat storage berbiaya rendah pada sistem alat pengering.
Reverse Time During Current Relay Performance to Support the Protection System Practicum Wahyono, Wahyono; sumarno, F. Gatot; W, wiwik Purwati; margana, margana; suwarti, Suwarti; N., Ajie Pribadi
Eksergi Vol. 18 No. 2 (2022): MAY 2022
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1124.259 KB) | DOI: 10.32497/eksergi.v18i2.3572

Abstract

””Overcurrent Relay is one of the protection system tools in the electricity network. Overcurrent Relay works based on the increase in fault current that exceeds a certain safety value and a certain period of time. The type of relay that will be used in this test is the IDMT NX203A Overcurrent Relay. The purpose of this test is to get a good practicum module and to prove the inverted time relay characteristic curve according to British Standard BS142. In the test, the tool to be assembled is tested for its work function so that in data collection errors can be avoided while the relay on the module will be given a current setting of 2A; 3A; and 4A with TMS0.05; 0.5; and 1.0 which will be connected to a digital timer so that if the fault current exceeds the setting current, the relay will automatically give a signal and the digital timer will show the time when the current is cut off. The final result is a practicum module where each tool functions under normal working conditions and a graph of time against relay current for setting current 2A, fastest time 0.498s at 9A fault current and 0.05 TMS, longest time 12.991s at 4A TM fault current. . 1.0. Current setting of 3A for the fastest time is 0.572s at fault current of 9A and TM 0.05, for the longest time is 35.854s at fault current of 4A and TM 1.0. Current setting of 4A for the fastest time is 0.708s at fault current of 9A and TM 0.05, for the longest time is 55.979s at fault current of 5A and TM 1.0.
Case Study of Heat Transfer on Heater Performance of Injection Molding Machines Before and After Maintenace Surindra, Mochamad Denny; Su”™udy, Ahmad Hamim; Hermawan, Baktiyar Mei; Aulia, Nur Fatowil; Priyoatmojo, Slamet; Sumarno, F. Gatot; Suwoto, Gatot
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 Hermawan, Baktiyar Mei; Sumarno, F. Gatot; Prasetyo, Totok; Sahid, Sahid; Roihatin, Anis; Aulia, Nur Fatowil; Surindra, M. Denny; Mulyono, Mulyono; Sofiani, Gizella; Putri, Tania Prameswari; Ariyanto, Wahyu
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.
Evaluation Of Refrigerating Load And Air Flow Performance In Air Conditioning Unit at Hospital Z Aulia, Nur Fatowil; Hendrawati, Dwiana; Hanif, Muhammad; Mei H, Baktiyar; Hamim S, Ahmad; Sumarno, F. Gatot; Surindra, M. Denny
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.v19i01.4253

Abstract

This research was conducted to evaluate air conditioning systems in pharmaceutical warehouses against the ANSI/ASHRAE/ASHE ventilation standards 170 ”“ 2008 and SNI-03-6572-2001. The method used is to calculate the cooling load on the FCU (Fan Coil Unit) using the CLTD (Cooling Load Temperature Difference) method and calculate the External Static Pressure on the ducting system. The analysis is carried out by comparing the results of calculating the FCU requirements with the actual specifications that have been implemented. Furthermore, the measurement results of the existing room air condition are compared with the standards for pharmaceutical warehouse applications. The calculation results show that the pharmaceutical warehouse has a cooling load of 47,472.72 Btu/hr, and has an external static pressure of 123 Pa. While the selected FCU (Fan Coil Unit) has a capacity of 78,771 Btu/hr and a maximum external static pressure of 130 Pa with a rated airflow of 4000 m3/hr. After 9 years of use, it is known that the rated airflow has decreased by around 37% of the FCU capacity. Existing room air conditions obtained the extreme temperature and RH of 23.36 °C and 72%, respectively.
Micro Hydro Power Plant (MHP) performance using breast-shot waterwheel with different electrical load to improve efficiency Herlambang, Yusuf Dewantoro; Bono, Bono; Suwoto, Gatot; Hermawan, Baktiyar Mei; Sumarno, F. Gatot; Margana, Margana; Marliyati, Marliyati
Jurnal Polimesin Vol 22, No 3 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i3.4608

Abstract

The aim of this study is to investigate the performance of breast-shot waterwheel with different electrical loads to increase efficiency. The method used is to design a pinwheel blade using blade material with a supporting frame added to the top, middle, and bottom of the pinwheel blade. The blade material used a thickness of 1.5 mm with angle iron installed on the three sides of the blade with a size of 30 mm × 30 mm × 3 mm. Tests were carried out with variations in lamp load when the water flow rate and water velocity were constant. Parameters measured in this test are water flow rate (m3/s), velocity of water (m/s), head of water (m), generator rotation (rpm), electric current (A), and generator output voltage (V). The results of the Hydro Power Plant (MHP) test with a waterwheel drive with the highest efficiency value at a water discharge of 0.267 m3/s, a velocity of 5.069 m/s, a generator rotation of 940 rpm, and a load of 840 W, which is 10.74%.
Co-Authors - Suwarti, - An Nizhami, Avicenna Anis Roihatin Ariyanto, Wahyu Aulia, Nur Fatowil A’tohillah, Muhammad Khusnul Bono Bono Didik Darmawan, Didik Dwiana Hendrawati Gatot Suwoto Hamim S, Ahmad Hermawan, Baktiyar Mei Kholifah, Nevita Nur Luthfiana, Nadia Tasya Ayu Margana Margana Marliyati Marliyati, Marliyati Mei H, Baktiyar Mochammad Denny Surindra Muhammad Hanif Mulyono Mulyono N., Ajie Pribadi Nanang Apriandi Prakoso, Raden Gumilang Aji Putri, Tania Prameswari Rudy Haryanto Sahid Sahid Slamet Priyoatmojo, Slamet Sofiani, Gizella Suwarti Suwarti Su”™udy, Ahmad Hamim Totok Prasetyo W, wiwik Purwati Wahyono Wahyono Yusuf Dewantoro Herlambang