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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 Budimas : Jurnal Pengabdian Masyarakat Kontribusi: Jurnal Penelitian dan Pengabdian Kepada Masyarakat 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 Jurnal Pengabdian Kepada Masyarakat
Mochammad Denny Surindra
Politeknik Negeri Semarang
Religion 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 Other

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Circular Economy And Sustainability: Mengubah Limbah Tekstil Konveksi Menjadi Produk Baju Hewan Dalam Program MBKMWirausaha Merdeka Alamsyah, Fredo Ladona; Surindra, Bayu
Jurnal Pengabdian Masyarakat Nusantara Vol 4 No 2 (2025): Juni 2025
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/dimastara.v4i2.24691

Abstract

Inovasi berbasis ekonomi sirkular yang bertujuan untuk mengolah limbah tekstil konveksi menjadi produk baju dan aksesori hewan peliharaan yang bernilai ekonomi tinggi. Program ini dilaksanakan di Kelurahan Bandar Kidul, Kecamatan Mojoroto, Kota Kediri, sebagai bagian dari Merdeka Belajar Kampus Merdeka (MBKM) dalam skema Wirausaha Merdeka. Pendekatan ini tidak hanya membantu mengurangi limbah tekstil sebesar 10 kg per bulan dan emisi karbon hingga 20 kg CO₂, tetapi juga memberikan dampak sosial berupa penciptaan lapangan kerja bagi 4 orang di komunitas lokal dengan kontribusi pendapatan sebesar Rp 4.000.000 per bulan. Analisis Key Metrics menunjukkan peningkatan pendapatan bulanan sebesar 33%, biaya akuisisi pelanggan (CAC) Rp 4.000, nilai pelanggan (CLTV) Rp 24.000, dan gross margin sebesar 66,7%. Model bisnis ini menggunakan strategi penjualan langsung, layanan desain khusus, dan penyewaan produk. Dengan potensi pasar senilai Rp 648 miliar (TAM), program ini berhasil menetapkan Harga Pokok Produksi (HPP) sebesar Rp 57.800 dan harga jual Rp 73.000, menghasilkan margin laba 100%. Untuk mencapai titik impas, bisnis ini membutuhkan penjualan 303 unit per bulan. Program ini membuktikan bahwa inovasi kreatif berbasis komunitas dapat menjadi solusi efektif untuk masalah lingkungan, sekaligus menciptakan manfaat ekonomi yang berkelanjutan.
PENGARUH LITERASI EKONOMI, PERSEPSI HARGA, DAN PROMOSI PENJUALAN TERHADAP PERILAKU PEMBELIAN IMPULSIF PRODUK FASHION DI SHOPEE PADA MAHASISWA PRODI PENDIDIKAN EKONOMI UNIVERSITAS NUSANTARA PGRI KEDIRI Cahyanti, Era Sabina; Irmayanti, Elis; Surindra, Bayu
Prosiding Simposium Nasional Manajemen dan Bisnis Vol. 4 (2025): Simposium Manajemen dan Bisnis
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/9p5tjx13

Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh secara persial maupun simultan literasi ekonomi, persepsi harga, dan promosi penjualan terhadap perilaku pembelian impulsif produk fashion di Shopee pada mahasiswa Prodi Pendidikan Ekonomi Universitas Nusantara PGRI Kediri. Penelitian ini menggunakan metode pendekatan kuantitatif dengan jenis penelitian asosiatif. Data diperoleh melalui penyebaran kuesioner kepada 121 responden Mahasiswa Prodi Pendidikan Ekonomi, yang dipilih menggunakan teknik sampling jenuh, kemudian dianalisis menggunakan metode regresi linier berganda yang diolah melalui perangkat lunak IBM SPSS versi 23. Hasil penelitian menandakan bahwa literasi ekonomi, persepsi harga, dan promosi penjualan secara parsial  berpengaruh positif dan signifikan terhadap perilaku pembelian impulsif  dengan masing- masing nilai signifikansi sebesar 0,004, 0,000,dan 0,004 serta nilai t hitung sebesar 2.908, 0,247, dan 2.927. kemudian literasi ekonomi, persepsi harga, dan promosi penjualan berpengaruh simultan terhadap perilaku pembelian impulsive dengan nilai signifikan sebesar 0,000 dengan F hitung sebesar 17.792. kebaruan penelitian terletak pada persepsi harga dan promosi penjualan dimana tidak selalu berdampak positif.
STUDI ANALISIS SISTEM FISIK THERMAL DENGAN PEMODELAN STIRRED TANK HEATER MENGGUNAKAN SIMULINK MATLAB Surindra, Mochamad Denny
Eksergi Vol. 17 No. 1 (2021): JANUARI 2021
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (654.89 KB) | DOI: 10.32497/eksergi.v17i1.2282

Abstract

System thermal dengan model Stirrer Tank Heater diturunkan secara matematik dan memodelkan di dalam Simulink Matlab. Hasil akan dianalisis dan dibandingkan antara system yang menggunakan gangguan dan system yang tidak ada gangguannya. Dengan demikian transfer function untuk perubahan laju kalor input dengan temperature output adalah R/RCs, sedangkan untuk temperature cairan aliran masuk berfluktuasi adalah 1/RCs dan berfunsi sebagai gangguan (disturbance). Sistem thermal stirrer tank heater tanpa gangguan dengan sisi aliran masukan ditutup setelah penuh dan sisi output tidak bervariasi memberikan analisi performance yang lebih baik dengan data 1,56
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.
Co-Authors - Sunarwo, - - Wahyono Afandi, Tjetjep Yusuf Ahmad Firyal Adila 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 Fatmawati, Nurul Fatowil Aulia, Nur Fediansah, Teddy Candra Forijati, RR Gatot Suwoto Gupta, Munish Kumar Hamidah, Roimatul Hamim S, Ahmad Hamim Su”™udy, Ahmad Hariyono, Catur Hermawan, Baktiyar Mei Indhana Sudiharto Jev N Hilga, Jev N Khoiroh, Ikhwatinah Kholipah, Nur Krolczyk, Grzegorz Kusnul Khotimah Lestari, Siska Nurazizah Lucky Pradigta Setiya Raharja Luki Septya Mahendra 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 Priya Ditya, Novendra Purwanto Purwanto Pusporini, Endang Putri, Devita Anggara Putri, Tania Prameswari Rizka, Ayu Nur Rizki Yoga Pratama, Sendi Rizki Yoga Pratama Rodziyah, Fatimatur Rohmah, Dewi Sholihatur Rose Mita Lukiani, Eunike Rosiana, Ita Rr. Forijati -, Rr. Forijati Rudy Haryanto Sahid Sahid Setyawan, Sendy Shafa, Shinta Maya Slamet Priyoatmojo, Slamet Sofiani, Gizella Sumarno . Supriyo Supriyo Suryono Suryono Sutanto, Bayu Suwarti Suwarti Su”™udy, Ahmad Hamim Totok Prasetyo Ulum, Muhammad Showi Nailul Utomo, Jonny Valenta, Permata Wahyono Wahyono Wahyu Caesarendra Wahyu Prastyaningtyas, Efa Wardani, Kinanti Tri Widya Isworo, Nenchy Widyaningrum, Bakti Wiwik Purwati Widyaningsih Yulianto, Dody Yusuf Afandi, Tjetjep Yusuf Dewantoro Herlambang Zainal Arifin Zuliana Sari, Kiky