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All Journal BANGUN REKAPRIMA Eksergi: Jurnal Teknik Energi Jurnal Hilirisasi Technology kepada Masyarakat (SITECHMAS) Jurnal Pengabdian Masyarakat Bangsa AutoMech : Jurnal Teknik Mesin Jurnal Polimesin
Aulia, Nur Fatowil
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EVALUASI KINERJA POMPA SENTRIFUGAL PADA SISTEM THERMAL OIL DI INDUSTRI PENGOLAHAN MAKANAN MENGGUNAKAN SOFTWARE PSAT Aulia, Nur Fatowil
Eksergi Vol. 17 No. 3 (2021): SEPTEMBER 2021
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v17i3.4389

Abstract

Pompa merupakan mesin yang digunakan untuk memindahkan fluida. Penelitian inidilakukan pada unit pompa yang ada di salah satu industry makanan, digunakan uuntukmemindahkan fluida berjenis thermal oil yang temperaturnya mencapai 300C. Penelitiandilakukan untuk mengetahui kinerja dari pompa sentrifugal dengan menggunakan dataoperasi yang ditinjau dari daya pompa, Head Pompa, Headloss mayor, minor, dan daya fluidayang dikorelasikan dengan software PSAT. Hasil menunjukkan bahwa perhitungan manualdidapatkan Head total sebesar 65,43 m dengan head loss total sebesar 11,86 m dan effisiensisebesar 82%. Hasil perhitungan PSAT menunjukan effisiensi optimal pompa sebesar 87,5%dan effisiensi exsisting sebesar 85,6% yang artinya memiliki perbedaan sebesar 4% - 7% dariperhitungan manual. Hal ini bisa disebabkan karena software tidak memperhitungkanbeberapa faktor seperti head loss
Characteristics of the Savonius turbine to variation angles Su'udy, Ahmad Hamim; Prasetiyo, Budhi; Aulia, Nur Fatowil; Surindra”¬, ”ªMochamad Denny; Safarudin”¬, ”ªYanuar Mahfudz; Sutanto, Bayu
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4476

Abstract

Wind energy is a form of energy that can be converted into electrical energy using a wind turbine. Based on the axis of rotation, wind turbines are of two types, namely horizontal axis wind turbines and vertical axis wind turbines. Wind turbines with a vertical axis have several types including Darrieus wind turbines, Savonius wind turbines, and H wind turbines. The purpose of this manufacture and test is to determine the effect of wind speed and system efficiency from the Savonius 8 blade wind turbine with variations in the angle of attack on wind speed. certain. Based on the test results, it can be seen that the highest generator power value is at a wind speed of 6 m/s worth 3.85 Watt with an angle of attack of 20 ° and a load of 1 DC lamp, a wind speed of 7 m/s worth 5.58 Watt with an angle of attack   f 0 ° and a load 3 DC lamps, wind speed of 8 m/s worth 8,52 Watts with an angle of attack of 5 ° and a load of 4 DC lamps. While the highest system efficiency value is obtained at a wind speed of 6 m/s worth 4,62 % with an angle of attack of 20 ° and a load of 1 DC lamp, a wind speed of 7 m/s worth 4,218 % with an angle of attack of 0 ° and a load of 3 DC lamps, wind speed 8 m/s worth 4,31 % with an angle of 5 ° and a load of 4 DC lamps.
Statistical Process Control And Analytical Hierarchy Process Methods For Reducing Earth Resistance Wahyono, Wahyono; Aulia, Nur Fatowil; Hermawan, Baktiyar Mei
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4477

Abstract

Security or protection systems at generators, substations, transmission, and housing and others, especially to overcome lightning disturbances and leakage currents, the earthing system must meet the required standards. For each part of the system, from transmission, substation and residential electricity utilization as well as other parts, the standard of earth resistance is not the same, for example for housing a maximum of 5 Ω, for a small generator system a maximum of 10 Ω, for a large generator a maximum of 20 Ω and so on etc. In areas where the soil type resistance is high, it is necessary to reduce the value of the earth resistance so that it reaches the Indonesian national standard. There are many ways to reduce the value of earth resistance, including lowering soil resistivity, adding electrodes to the soil, changing the type of electrode and its diameter, and so on. The aim of the research was to determine the effect of the value of earthing resistance on the depth of electrode planting and the type of soil that is affected by the water content in the soil and to apply simple statistical tools, namely Statistical Process Control (SPC) and Anlytical Hierarchy Process (AHP).The measurement method in this research uses a three-point system, namely one point for the test electrode and two points for the auxiliary electrode and the measuring instrument used to measure earth resistance is a digital earth resistance tester type digital model 4105A. This tool is designed according to international electrical commission (IEC) standards. To analyze reducing earth resistance using Statistical Process Control (SPC) and Analytical Hierarchy Process (AHP) methods. The design of this research is to answer the problems and research objectives that have been planned, namely to determine the effect of soil type on earth resistance and to analyze efforts to reduce the value of earth resistance to achieve standards with statistical process control (SPC) and analytical hierarchy process (AHP) methods. To find potential causes, it is done by calculating the analytical hierarchy process (AHP) in order to obtain a sequence of problems to be solved. If the consistency ratio value is more than 10%, then the data judgment must be corrected, but if the consistency ratio is less than or equal to 10% then the calculation results are declared correct or accepted. From the results of the AHP calculation, it is then verified by testing the earth resistance.
Study of solar power plants as an aerator driver based on the Internet of Things (IoT) Margana, Margana; Wahyono, Wahyono; Hermawan, Baktiyar Mei; W, Wiwik Purwati; Suwarti, Suwarti; Aulia, Nur Fatowil; Solikhin, Akhmad Riadzus
Eksergi Vol. 19 No. 2 (2023): MAY 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i2.4479

Abstract

The use of solar power plants is now developing, for example aerator drives with the Internet of Things. The purpose of designing aerators with the Internet of Things is to utilize programming instructions that each command can generate interaction with fellow devices and connect automatically without user intervention, even remotely. This research method begins with the study of literature, manufacture, installation of components, as an analysis carried out testing and data collection. The results of the tests conducted on day 5 include, the best solar radiation intensity power of 886.786 W/m2, the power produced by solar cells of 473.099 W and aerator power of 75.843 W, solar panel efficiency of 14.749%. and PLTS system efficiency of 4.275%. In this test, it was found that the addition of aeration can increase oxygen concentration and pH value of water.                                                                Keywords- Aerator, PLTS, Performance      
Investigation of Double Screw Compressor Characteristic based on Experimental in Industry Aulia, Nur Fatowil; Surindra, Mochamad Denny; Su”™udy, Ahmad Hamim; Apriandi, Nanang; Ulum, Muhammad Showi Nailul; Priyoatmojo, Slamet
Eksergi Vol. 19 No. 03 (2023): SEPTEMBER 2023
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v19i03.5038

Abstract

Large-scale compressed air equipment is the only way to meet the demand for air for production facilities such as the pharmaceutical, automotive, or combustion processes industries. As one of the main driving components in the air compressor system, the double screw determines the reliability and performance of the entire compressed air system. Double screw compressors are a promising option for use in large-scale compressed air systems due to their high efficiency and reliability. The double screw profile has been specially designed to increase compression capability over a period of more than 24 hours with a range of 400 to 385 m3 per hour. The cooling oil works well keeping the compressor temperature constant at around 100 0C, even though there are very active temperature fluctuations. On the working pressure side the compressor as a whole is constant, although there is a significant spike in the dryer pressure. The dryer pressure experienced a significant increase reaching 6.9 Bar in the sixth data collection, while the cooling oil pressure and tank pressure were the same at 6.6 Bar, and the air pressure was 6.3 Bar. The results of observing the performance of compressors during industrial operation have presented the ideal working conditions for double screw compressors reaching 58.4 kJ/kg, while the actual working conditions of compressors are 66.6 kJ/kg. Overall, the average compressor efficiency is 87.81%.
Numerical Study Of The Influence Of Air Flow Through Rectangular Elbow 90 ° With Triangle Inlet Body Disturbance Aulia, Nur Fatowil; Faradis, Luke Ezra; Su”™udy, Ahmad Hamim; Safarudin, Yanuar Mahfudz; Mulyono, Mulyono; Hermawan, Baktiyar Mei; Sutanto, Bayu
Eksergi Vol. 20 No. 01 (2024): JANUARY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i01.5440

Abstract

AbstrakThis research is to determine the effect of air flow flowing through a 90 ° square elbow with the additional shape of a triangle inlet disturbance body. Simulations were carried out using the Computational Fluid Dynamics (CFD) method to analyze air flow characteristics and changes in flow patterns due to the presence of additional triangular shapes in the flow channel. Numerical simulations are carried out by taking the 90 ° square elbow geometry as the basic model and adding an additional triangle inlet disturbance body shape to it. The simulation results show that the triangle inlet disturbance body significantly influences the air flow inside the elbow. This effect can increase turbulence producing different pressure and velocity contours along the elbow. The effect of flow velocity on the flow in the elbow results in a higher velocity if the form of disturbance is also greater. This research could provide greater understanding of the influence of additional components on fluid flow in channels with similar geometries, opening up potential applications across a wide range of industries.Keywords”” Air flow simulation, Triangle Disturbance, Pressure, Speed
Analysis Of Solar Power Plants With A Capacity Of 100 Wp With Automatic Transfer Switch In The Energy Conversion Laboratory Of Semarang State Polytechnic Suwarti, Suwarti; Aulia, Nur Fatowil; Wahyono, Wahyono; Prasetyo, Budhi; Hendrawati, Dwiana; Hermawan, Baktiyar Mei
Eksergi Vol. 20 No. 02 (2024): MAY 2024
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v20i02.5807

Abstract

Solar energy is one of the renewable energy sourcesby utilizing the sun as its energy source. The planning of thePLTS uses an on-grid system, the system is still connected tothe PLN network. The system is used as a backup forelectricity flow. The system will work automatically when thePLN electricity flow is cut off by utilizing the AutomaticTransfer Switch (ATS) control system. The PLTS was tested bymeasuring the voltage, current, and input and output powerfor 5 days from 09.00-15.00 WIB with data collection every 60minutes. Then calculations were made to determine theefficiency of the PLTS. Calculations were also made of theenergy produced by the panels needed and produced by thelights ideally and actually. The results of the DC voltage andDC current tests on average at a load of 70 Watts produced bythe solar panel were 12.7 V and 2.41 A with a data collectionperiod of 7 hours, producing energy of 214.3 Wh andproducing the highest efficiency of 7.9% and the lowest 4.84%.
Heat Source in a Pyrolysis Reactor Design for Energy Converting of Polypropylene into Fuel Oil at PPSDM Migas, Cepu Mulyono, Mulyono; Roihatin, Anis; Mukti, Reka Handoyo; Aulia, Nur Fatowil; Huda, Luqman Al
Eksergi Vol. 21 No. 02 (2025): MAY 2025
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v21i02.6843

Abstract

Furnace-02 at PPSDM Migas is utilised in the petroleum processing of residual fuel. The efficiency value of furnace-02 is 62.71%, with 119,1763 Btu/h of heat being wasted through flue gas and a flow velocity of 164 m3/min. The heat value in the flue gas is utilised for the purpose of pyrolysis of the plastic, with a view to optimising energy use in the furnace. The process of plastic pyrolysis has been demonstrated to yield pyrolysis oil, which possesses a calorific value comparable to that of gasoline (10,520 kcal/kg). This pyrolysis oil has the potential to serve as a substitute fuel source for fossil fuels. The design of the pyrolysis system burner modification is such that its capacity is 75 kg/hour. The energy utilisation in the design amounted to 28,645.02 kJ/h, representing 2.3% of the total flue gas heat.
Evaluasi Kinerja AC Sistem VRF (Variable Refrigerant Flow) Berkapasitas 20 PK pada Rumah Sakit X Aulia, Nur Fatowil; Winardi, Yoyok
AutoMech : Jurnal Teknik Mesin Vol. 3 No. 01 (2023): Mei
Publisher : Universitas Muhammadiyah Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24269/jtm.v3i01.7122

Abstract

Penelitian ini dilakukan untuk mengetahui kinerja dari AC sistem VRF ( Variable Refrigerant Flow ) dengan standar nasional SNI 6390:2020. Metode yang digunakan adalah dengan mengukur temperatur yang ada didalam siklus refrigerasi ( T1,T2,T3,T4 ) dan tekanannya ( P1, P2 ) serta tegangan dan arus listrik pada kompresor untuk 8 unit mesin AC sistem VRF. Penelitian dilakukan dengan menghitung kerja kompresi, kalor yang dilepas kondensor, dampak refrigerasi , daya listrik kompresor dan COPRefrigerasi . analisis dilakukan dengan membandingkan hasil COPRefrigerasi dengan standar nasional SNI 6390:2020 didapatkan nilai terkecil COPRefrigerasi 6,79 dengan kerja kompresi 25,736 kJ/kg, dampak refrigerasi 174,779 kJ/kg dan COPRefrigerasi terbesar 14,53 dengan kerja kompresi 13,026 kJ/kg, dampak refrigerasi 189,338 kJ/kg. Menurut SNI 6390:2020 nilai minimum COPRefrigerasi  3,81 untuk mesin AC sistem VRF, maka hasil dari data tersebut menunjukan kinerja AC sistem VRF di Rumah Sakit X  sudah sesuai standar nasional karena sudah melebihi nilai minimum COPRefrigerasi SNI 6390:2020
Computational Analysis Of Pipe Bend Angle Effect On Pressure Drop Akbar, Muhammad Khoirul; Roihatin, Anis; Aulia, Nur Fatowil
Jurnal Polimesin Vol 22, No 1 (2024): February
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v22i1.4229

Abstract

The air conditioning system is a significant energy source inskyscrapersfor supplying cool air to all rooms. However, the process has energy losses due to the ducting used. If the problem of energy loss can be solved, the air conditioning system will bring advantages in terms of energy efficiency and financial savings. A pressure drop in air duct pipe installations, such as pipe bends, is one type of energy loss. This research intends to use Computational Fluid Dynamics (CFD) to investigate the effect of pipe bend angles and velocity relationships on pressure drop in air duct pipe installations, which has previously been validated by experimental research with a 0.17% error percentage. This study focuses on square pipe bends with varying 45o, 60o, and 90o bend angles. The research showed that when testing the highest fluid velocity of 19.68 m/s, the highest pressure drop was 275.69 Pa on the pipe bend angle of 90o, while the lowest pressure drop was 256.41 Pa on the pipe bend angle of 45o. When testing the lowest fluid velocity of 9.77 m/s the highest pressure drop was 67.73 Pa on the pipe bending angle of 90owhile the lowest pressure drop was 62.98 Pa on thepipe bending angle of 45o. The simulation results indicate that the larger pipe bend angle result in a higherpressure drop, and vice versa.
Co-Authors Ahmad Hamim Su’udy Akbar, Muhammad Khoirul Aminuyati An Nizhami, Avicenna Anis Roihatin Ariyanto, Wahyu Budhi Prasetiyo Budhi Prasetyo Dwiana Hendrawati F. Gatot Sumarno, F. Gatot Faradis, Luke Ezra Gatot Suwoto Hamim S, Ahmad Hermawan, Baktiyar Mei Huda, Luqman Al Laksana, Kurnia Adam Margana Margana Mariani, Dina Mei H, Baktiyar Mochammad Denny Surindra Muhammad Hanif Mukti, Reka Handoyo Mulyono Mulyono Nanang Apriandi Padang Yanuar Putri, Tania Prameswari Safaruddin, Yanuar Mahfudz Safarudin”¬, ”ªYanuar Mahfudz Sahid Sahid Sai'in, Ali Slamet Priyoatmojo, Slamet Sofiani, Gizella Solikhin, Akhmad Riadzus Supriyo Supriyo Surindra”¬, ”ªMochamad Denny Sutanto, Bayu Suwarti Suwarti Su”™udy, Ahmad Hamim Timotius Anggit Kristiawan Totok Prasetyo Ulum, Muhammad Showi Nailul W, wiwik Purwati Wahyono Wahyono Winardi, Yoyok Wiwik Purwati Widyaningsih Yanuar Mahfudz Safarudin