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All Journal Rotasi ENGINEERING Prosiding SNATIF Jurnal Rekayasa Mesin Efektor PINUS: Jurnal Penelitian Inovasi Pembelajaran Patrawidya: Seri Penerbitan Penelitian Sejarah dan Budaya Jurnal ABDINUS : Jurnal Pengabdian Nusantara Mechanical Engineering for Society and Industry Eksergi: Jurnal Teknik Energi Jurnal Pendidikan Ekonomi, Akuntansi dan Kewirausahaan (JPEAKU) Jurnal Pengabdian Masyarakat Bangsa International Journal of Economic Research and Financial Accounting Jurnal Pengabdian Masyarakat Nusantara SENMEA Prosiding Simposium Nasional Manajemen dan Bisnis
Mochammad Denny Surindra
Politeknik Negeri Semarang
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Transportation

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Solar Cell Performance Test against Load Variations Sumarno, F Gatot; Wahyono, Wahyono; Mei Hermawan, Baktiyar; Hamim Su”™udy, Ahmad; Fatowil Aulia, Nur; Khoiroh, Ikhwatinah; Surindra, Mochammad Denny
Eksergi Vol. 18 No. 2 (2022): MAY 2022
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (384.172 KB) | DOI: 10.32497/eksergi.v18i2.3570

Abstract

Solar cell is a converter of light energy into electrical energy. This study aims to examine the characteristics of the solar cell to load variations. The research was conducted at the Semarang State Polytechnic Energy Conversion Lab. The solar cell used in the research of the monocrystalline solar cell type KTENG CP-520S. The research method is carried out by measuring the value of solar intensity, voltage and electric current from the solar cell, then calculating the value of the power and efficiency of the solar cell. The greater the intensity of sunlight, the better the characteristics of the solar cell with a note that the solar cell surface temperature must be stable at 250C. The results showed that the highest input power of the solar cell was 5293.69 watts at a lamp load of 115 watts at 833.6 W/m2 of radiation during sunny weather. The highest value of the output power of the solar cell is 191.52 watts when the lamp is loaded with 190 watts of radiation at 739.4 W/m2 during sunny weather. While the highest value of the load output power is 212.43 watts when the lamp is loaded with 200 watts of radiation at 724.4 W/m2 when the weather is sunny. The highest efficiency of the solar cell is 4.13% when the lamp is loaded with 200 watts of radiation at 724.4 W/m2 when the weather is sunny. And the highest value of Solar Power Plant efficiency is 4.61% at a 200 watt lamp loading at 724.4 W/m2 radiation when the weather is sunny.
Biogas Desulfurization Using Iron Gram Waste Machining Practicum Process at The Department of Mechanical Engineering, Politeknik Negeri Semarang Apriandi, Nanang; Widyaningsih, Wiwik Purwati; Margana, Margana; Surindra, Mochamad Denny; Supriyo, Supriyo; Luthfiana, Nadia Tasya Ayu
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.v18i3.3785

Abstract

The important matter about biogas as an alternative energy source was the presence of hydrogen sulfide (H2S) which is very corrosive. The biogas desulfurization process was absolutely necessary to reduce the risk of damage to the equipment. For small-scale applications, the selection of the type of adsorbent became important to reduce additional costs. One alternative material that can be used was iron gram waste. The aim of this study was to investigate the use of iron gram waste resulting from the machining practicum process at the Department of Mechanical Engineering, Politeknik Negeri Semarang as an alternative material for making adsorbents. Iron gram waste was processed into Iron (III) Oxide (Fe2O3) and Iron (III) Hydroxide (Fe(OH)3), formed into billets with an average billet mass of 250 gr. The performance test of the adsorbent in the biogas desulfurization process was carried out under conditions of variation in the flow rate of biogas feed 1, 2, and 3 liters per minute, and the volume of biogas purified in one process was 50 liters. As a result, the most optimum performance was obtained in the test with a feed biogas flow rate of 1 liter/minute, with a percentage reduction in H2S levels contained in the biogas by an average of 82,56%.
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.
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%.
Analysis of the Impact of Load Change on the Efficiency of the Heat Exchanger on Closed-circuit Cooling Water with a Capacity of 300 MW Nabila, Lathifa Dylla; Apriandi, Nanang; Herlambang, Yusuf Dewantoro; Surindra, Mochamad Denny
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.v20i01.5411

Abstract

Electricity has become one of the most crucial components of life. The steam power plant (PLTU) is the most significant contributor to the power supply process in Indonesia, with an installed capacity of 29.57%. A review of each component is required to support the sustainability of the production process at PLTU. This research discusses the heat exchanger's components in the refrigeration system at PT. XYZ. The cooling system in PLTU plays a vital role in preventing overheating of the power plant components, which can cause an interruption of the energy generation process. Following this, research was carried out on the influence of load changes on the efficiency of heat exchangers in PT. XYZ cooling systems using observation methods, interviews, and literature studies. Such methods produced data that could be used to calculate the efficiency value. From the results of the investigation, it was concluded that the performance of the PT. XYZ heat exchanger was at its best at maximum load with an efficiency presentation of 68.29% and at its lowest at minimum load with an effectiveness presentation of 59.95%. However, the value was still below the standard value of efficiency of the heat exchangers, which is 75%, so it required more intensive treatment to improve its efficiency value.
Analisis Jenis Coolant terhadap Temperatur dan Keausan Mata Pahat pada Proses Pengeboran Pegas Daun SUP9 Aldio, Rieza Zulrian; Fadila, Muhd Ridho Ilham; Dedikarni, Dedikarni; Yulianto, Dody; Surindra, Mochamad Denny
Jurnal Rekayasa Mesin Vol. 19 No. 1 (2024): Volume 19, Nomor 1, April 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i1.5362

Abstract

Pegas daun adalah jenis suspensi yang biasa digunakan pada truk pengangkut beban yang berat. Salah satu langkah recycle adalah pengeboran ulang pegas daun yang masih layak digunakan. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan coolant pada proses pengeboran ulang pegas daun terhadap temperature dan keausan mata pahat. Proses pengeboran menggunakan baja SUP9 dan mata pahat HSS berdiameter 17mm pada putaran spindel 280rpm dengan variasi coolant oli dromus, air bersih, dan minyak kelapa. Oli dromus diemulsikan dengan air pada perbandingan 70 persen air dan 30 persen oli dromus. Pengujian yang dilakukan adalah pengukuran temperatur menggunakan thermogun selama proses pengeboran dan pengukuran tingkat keausan mata pahat menggunakan mikroskop Olympus. Rata-rata temperatur pengeboran yang dihasilkan adalah 37.90C 48.570C dan 52.650C. Oli dromus menghasilkan temperatur paling rendah dan stabil. Dari observasi keausan, didapat minyak kelapa menghasilkan panjang keausan terendah 1661 µm dibandingkan air bersih 3720,7 µm dan oli dromus 3373,4 µm. Meski minyak kelapa menghasilkan temperatur tertinggi dalam penelitian ini, minyak kelapa mempunyai kemampuan untuk mengurangi nilai aus paling baik daripada coolant lainnya.
Pengaruh Persepsi Siswa Tentang Metode Mengajar Guru dan Kemandirian Belajar Terhadap Hasil Belajar Akuntansi Pada Siswa Kelas X Akuntansi SMK PGRI 3 Kediri Zuliana Sari, Kiky; Yusuf Afandi, Tjetjep; Surindra, Bayu
PINUS: Jurnal Penelitian Inovasi Pembelajaran Vol 6 No 2 (2021): Volume 6 Nomor 2 Tahun 2021
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/pn.v6i2.14915

Abstract

Abstract Basically students have a positive assumption on the way that the subject teacher uses the way in teaching and delivering materials. Based on the results of the initial research at SMK PGRI 3 Kediri, it is known that the value obtained by students is less than the maximum. Where the learning results obtained by students are still below the minimum completion criteria (KKM) of seventy-five (75). This research aims to know the influence between teacher methods in teaching and the level of independence in students' learning, as well as changes in student learning outcomes in accounting subjects at SMK PGRI 3 Kediri. The research method used in this study is quantitative method with double regression approach. Where the object is a grade X student of 25 students. The results of this study generally showed a positive influence or have a significant influence on the methods and ways used by teachers in teaching, as well as the influence between the independence carried out by students during learning on the results obtained by students in learning in school. Furthermore, students' perception of the methods used by teachers in teaching and showing self-reliance in learning, simultaneously has a positive and significant influence. Keywords: Teacher Teaching Method, Self-Reliance, Learning Outcomes
Pengembangan E-Modul Ekonomi Mata Pelajaran Ekonomi Bisnis Materi Pelaku Ekonomi Untuk Siswa Kelas X AKL 1 SMKN 2 Kediri Kusnul Khotimah; Irmayanti, Elis; Surindra, Bayu
PINUS: Jurnal Penelitian Inovasi Pembelajaran Vol 7 No 1 (2021): Volume 7 Nomor 1 Tahun 2021
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/pn.v7i1.16374

Abstract

In research, it aims to result in e-Module economics for students of class X AKL 1 SMKN 2 Kediri. The method used in the development of this research is to develop the ADDIE model through five stages, but in the current research is limited to four stages. Validation test to three expert validators, namely material expert validator, media expert validator, and linguist validator. The validation test in this study was carried out through two stages. The results of the material expert validation test in the first stage received a score of 80.83% with good criteria, experiencing an increase in results in the second stage with a value of 90.83% with excellent criteria. In the validation test the first stage media media experts get a score of 75% with sufficient criteria, and the second stage increases with a value of 93.75% with excellent criteria. Furthermore, for the validation test linguists get a score with sufficient criteria of 65.63% and increase in the second stage by 87.5% with good criteria. e-Modules that are currently developed are considered quite effective in supporting classroom learning. Students can access on their respective gadgets, not spend too much internet quota, arranged systematically, and compiled based on e-Module development guidelines by the Directorate of High School Development.
Co-Authors - Sunarwo, - - Wahyono Afandi, Tjetjep Yusuf Ahmad Hamim Su’udy Alamsyah, Fredo Ladona Aminuyati Anas, M Anas, M. Anggraini, Ari Saputri Novita Anggraini, Farida Dwi Anis Roihatin Ariyanto, Wahyu Artantri, Martia Winda Aulia, Nur Fatowil Ayatik, Tri B.S., Moh. Alfarizi Baidlok, Fina Nurul Budhi Prasetiyo Cahyanti, Era Sabina Chundori Achmad, Chundori Dedikarni, Dedikarni Dewi, Faradila Noer Kumala Dimas Bagus Priambada, Dimas Bagus Dwiana Hendrawati EFA WAHYU PRASTYANINGTYAS, EFA WAHYU Elis Irmayanti, Elis Eunike Rose Mita lukiani F Gatot Sumarno, F Gatot F. Gatot Sumarno, F. Gatot Fadila, Muhd Ridho Ilham Fatowil Aulia, Nur Fediansah, Teddy Candra Forijati, RR Gatot Suwoto Gupta, Munish Kumar Hamidah, Roimatul Hamim S, Ahmad Hamim Su”™udy, Ahmad Hermawan, Baktiyar Mei Jev N Hilga, Jev N Khoiroh, Ikhwatinah Kholipah, Nur Krolczyk, Grzegorz Kusnul Khotimah Lestari, Siska Nurazizah Luthfiana, Nadia Tasya Ayu Margana Margana Maulana, Vicy Cahya Mei H, Baktiyar MEI HERMAWAN, BAKTIYAR Muhammad Hanif Muhammad Muchson Mulyono Mulyono Nabila, Lathifa Dylla Nanang Apriandi Permata, Citra Intan Harum Pusporini, Endang Putri, Devita Anggara Putri, Tania Prameswari Rizka, Ayu Nur Rodziyah, Fatimatur Rosiana, Ita Rr. Forijati -, Rr. Forijati Rudy Haryanto Sahid Sahid Setyawan, Sendy Slamet Priyoatmojo, Slamet Sofiani, Gizella Sumarno . Supriyo Supriyo Sutanto, Bayu Suwarti Suwarti Su”™udy, Ahmad Hamim Totok Prasetyo Ulum, Muhammad Showi Nailul Wahyono Wahyono Wahyu Caesarendra Wardani, Kinanti Tri Widya Isworo, Nenchy Widyaningrum, Bakti Wiwik Purwati Widyaningsih Yulianto, Dody Yusuf Afandi, Tjetjep Yusuf Dewantoro Herlambang Zainal Arifin Zuliana Sari, Kiky