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Nanang Apriandi
Politeknik Negeri Semarang
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Produksi Biogas Dari Kotoran Sapi Menggunakan Digester Anaerobik Tipe Batch Skala Kecil: Pengaruh Hydraulic Retention Time (HRT) Terhadap Kualitas Biogas Nanang Apriandi; Suwarti, Suwarti; Widyaningsih, Wiwik Purwati; Raharjanti, Rani
JST (Jurnal Sains dan Teknologi) Vol. 12 No. 1 (2023): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v12i1.57310

Abstract

Dalam merancang digester biogas skala besar dan beroperasi jangka panjang dengan ketersediaan bahan baku setiap hari, penting untuk mengetahui waktu retensi hidrolik (HRT) dari substrat guna mengoptimalkan proses dekomposisi dan mendapatkan kualitas biogas yang baik. Komposisi gas terutama metana (CH4) menjadi dasar penentuan kualitas biogas. Pendekatan eksperimental menggunakan digester anaerobik tipe batch berkapasitas 50 liter dilakukan untuk menginvestigasi pengaruh HRT pada proses dekomposisi anaerobik terhadap kualitas biogas. Campuran kotoran sapi dan air dengan perbandingan 1:1 dan 1:2 digunakan sebagai substrat. Selanjutnya, kondisi proses dan kualitas biogas dianalisis dan dievaluasi dengan variabel HRT 3, 7, 14, 21, dan 28 hari. Hasil penelitian menunjukkan bahwa kualitas biogas tertinggi diperoleh dari proses dekomposisi anaerobik dengan komposisi substrat 1:1 dan pada HRT 28 hari, dengan kandungan CH4 sebesar 62,23 %vol dan nilai kalor sebesar 21745,71 kJ/m3. Hasil investigasi ini dapat dijadikan acuan di dalam merancang digester biogas skala besar dan beroperasi jangka panjang untuk berbagai tipe digester yang berbeda. Semakin lama HRT substrat pada proses dekomposisi anaerobik di dalam digester, semakin tinggi persentase kandungan CH4 dalam biogas, dan semakin tinggi pula nilai kalornya.
PERHITUNGAN ECONOMIC DISPATCH TIGA BUAH PEMBANGKIT MENGGUNAKAN METODE MERIT ORDER DENGAN MEMPERTIMBANGKAN LOSSES Mariani, Dina; Safarudin, Yanuar Mahfudz; Aulia, Nur Fatowil; Su'udy, Ahmad Hamim; MS, Nanang Apriandi; Hermawan, Baktiyar Mei
Eksergi Vol. 17 No. 3 (2021): SEPTEMBER 2021
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (538.767 KB) | DOI: 10.32497/eksergi.v17i3.2984

Abstract

Merit order adalah metode paling sederhana dalam economic dispatch yang dilakukan dengan mengurutkan pembangkit dari yang paling rendah sampai yang paling tinggi biaya operasinya. Pembangkit yang paling rendah biaya operasinya (Rp/MWh) dianggap sebagai pembangkit yang paling ekonomis. Penelitian ini membahas tentang perhitungan daya pada pembangkit dengan menggunakan metode merit order. Ada tiga pembangkit yang digunakan untu menyuplai beban sebesar 975 MW. Simulasi digunakan dengan memperhitungkan losses. Hasil menunjukkan bahwa merit order membantu dispatcher untuk mengambil keputusan lebih cepat. SOP merit order dibuat berdasarkan biaya operasi pembangkit sehingga harus selalu disesuaikan dengan harga bahan bakar terkini.
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%.
The Newton Model for Seaweed Drying: An Investigation of a Cabinet Dryer Using Biomass Energy Zulhan Widya Baskara; Apriandi, Nanang; Herlambang, Yusuf Dewantoro; Khoryanton, Ampala; Safarudin, Yanuar Mahfudz; Widya Baskara, Zulhan; Raharjanti, Rani
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.v19i01.4211

Abstract

This study investigates the viability of employing a cabinet-type dryer with a heat energy source derived from biomass combustion to dry Eucheuma sp. using Newton's model. In this investigation, seaweed was dried with air at a temperature of 55 °C. A reduction in water content of 8.1% was attained after six hours of drying. To make the data fit the suggested drying mathematical model, the data were examined and recorded. The model feasibility test shows that, with a coefficient of determination (R2) that is close to one and corrected at 0.9502, the Newton model can be used to predict the moisture content of dried seaweed after the drying process using a cabinet-type dryer with a source of heat energy from biomass combustion.
Utilization of Welding Electrode Waste To Purify Biogas From Hydrogen Sulfide Impurities Kristiawan, Timotius Anggit; Apriandi, Nanang; herlambang, Yusuf Dewantoro; Setiyawan, Trio; Wibowo, Andryana Dwiandara
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.v19i2.4451

Abstract

Abstract”” The biogas desulphurization process has a crucial role in the widespread use of biogas due to the toxic and corrosive nature of the element hydrogen sulfide on equipment. This study investigated the potential use of waste welding electrodes as a biogas purification medium. Variables in the form of feed biogas flow rates of 1, 2, and 3 liters/minute were studied for their effects. As a result, the most optimum performance was obtained in the test with a feed biogas flow rate of 1 liter/minute, with an average reduction percentage of hydrogen sulfide content in the biogas of 27.12%.
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.
Unjukkerja Panel Surya Tipe Terapung untuk Pembangkit Listrik Herlambang, Yusuf Dewantoro; Prasetiyo, Budhi; Wahyono, Wahyono; Apriandi, Nanang; Marliyati, Marliyati; Sutanto, Bayu
Jurnal Rekayasa Mesin Vol. 18 No. 3 (2023): Volume 18, Nomor 3, Desember 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i3.5069

Abstract

Penerapan Pembangkit Listrik Tenaga Surya (PLTS) membutuhkan lahan/daratan yang memiliki nilai ekonomis, padahal Indonesia merupakan negara tropis yang memiliki potensi energi surya dan negara kepulauan dengan luas sebesar 2/3 berupa perairan dan danau di daratan yang bisa dimanfaatkan untuk pembangkit energi surya. Pemanfaatan PLTS terapung tidak memerlukan lahan/daratan, dapat mengurangi evaporasi, serta sebagai media pendingin modul PV untuk meningkatkan efisiensi. Tujuan penelitian ini adalah merancang sistem PLTS pada kolam budidaya dengan memanfaatkan sumber energi surya. Penelitian dimulai dengan mengukur potensi energi matahari selanjutnya perancangan dan pemilihan komponen yang memiliki kapasitas sesuai. Setelah melakukan beberapa pengamatan di daerah tersebut, PLTS yang cocok digunakan untuk menghidupkan aerator adalah PLTS off grid. PLTS 200 Wp mampu untuk menghidupkan aerator 120 W selama 12 jam pada siang hari dan aerator 100 W selama 8 jam pada malam hari. Pada kondisi pengosongan baterai, tegangan output panel rata-rata sebesar 12,89 V dan arus rata-rata sebesar 6,2 A dan pada kondisi pengisian baterai, tegangan output panel rata-rata sebesar 12,39 V dan arus rata-rata sebesar 6,6 A. Efisiensi sistem tertinggi pada kondisi pengosongan baterai sebesar 99%. Hal ini dikarenakan pada sore hari radiasi matahari rendah sehingga arus yang dihasilkan panel surya rendah dan mendapatkan supply dari baterai.
DESIGN AND PERFORMANCE TEST OF A CABINET TYPE DRYER FOR DRYING BREADFRUIT CHIPS: A CASE STUDY OF THE SUMBER REJEKI PURWOSARI FARMERS GROUP, SEMARANG CITY Apriandi, Nanang; Kristiawan, Timotius Anggit; Herlambang, Yusuf Dewantoro; Supandi, Supandi; Abidin, Zainal; Wibowo, Andryana Dwiandara
Journal of Mechanical Engineering and Applied Technology Vol. 1 No. 3 (2023): Volume 1 Issue 3 Year 2023 (November 2023)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v1i3.5112

Abstract

This study aims to design and build a cabinet-type breadfruit chips dryer powered by liquefied petroleum gas (LPG) and to assess the dryer's characteristics, particularly by observing the temperature and relative humidity (RH) variables in the drying chamber. This characteristic data is critical for forecasting the dryer's ability during drying. The experimental approach was carried out in three stages: design, assembly, and testing without a drying load under two process conditions, charging and discharging. The testing time is 150 minutes, with the charging procedure taking 70 minutes and the discharging process taking 80 minutes. In general, the distribution of temperature and RH on each shelf in the drying chamber is consistent, both during the charging and discharging processes. In the charging-discharging process, the average temperature of the drying room is 45.39 C with a RH of 40.99%, while the plenum room average temperature is 77.02 C.
PEMBUATAN DAN UJI PERFORMA TERMAL ALAT PENGERING SKALA LABORATORIUM DENGAN PENAMBAHAN THERMAL ENERGY STORAGE (TES) BERBASIS PHASE CHANGE MATERIAL (PCM) Apriandi, Nanang; Herlambang, Yusuf Dewantoro; Negara, Komang Metty Trisna; Raharjanti, Rani
Journal of Mechanical Engineering and Applied Technology Vol. 2 No. 1 (2024): VOLUME 2 ISSUE 1 YEAR 2024 (MARCH 2024)
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jmeat.v2i1.5423

Abstract

Pengeringan merupakan salah satu metode pengawetan yang paling banyak digunakan untuk memperpanjang masa simpan produk pertanian, makanan, dan bahan lainnya. Penelitian ini bertujuan untuk merancang dan membangun alat pengering skala laboratorium yang inovatif dengan integrasi thermal energy storage (TES) berbasis phase change material (PCM) menggunakan paraffin wax sebagai media penyimpanan energi. Metode yang digunakan meliputi desain alat, perakitan, dan pengujian performa. Paraffin wax dipilih karena sifatnya yang mampu menyimpan dan melepaskan energi panas secara efisien pada rentang suhu pengeringan yang dibutuhkan. Penelitian ini secara khusus mengevaluasi kinerja termal dari alat pengering untuk mendapatkan karakteristik sistem berupa distribusi temperatur di ruang pengering, distribusi temperatur pada media TES, dan distribusi temperatur udara keluar alat pengering melalui cerobong. Hasil investigasi menunjukkan bahwa penambahan TES berbasis PCM paraffin wax mampu menjaga stabilitas temperatur di ruang pengering. Hal ini nantinya akan berdampak positif pada efisisensi sistem secara keseluruhan.
Co-Authors Abdul Syukur Alfauzi Afifa Pramesywari Ahmad Hamim Su’udy Ali Sai'in Aminuyati An Nizhami, Avicenna Anhar Riza Antariksawan Aris Fiatno Asih Priyati Aulia, Nur Fatowil Avicenna An-Nizhami A’tohillah, Muhammad Khusnul BAKTIYAR MEI HERMAWAN Berkah Fajar Tamtomo kiono BERKAH FAJAR TAMTOMO KIONO Bono Bono Budhi Prasetiyo Dwiana Hendrawati Elfrida Rizky Riadini F Gatot Sumarno, F Gatot F. Gatot Sumarno, F. Gatot Friska Ayu Fitrianti Sugiono Giarno Giarno Hatmoko, Sumantri Hermawan, Baktiyar Mei Hidayat, Agriananta Fahmi I Gusti Bagus Wijaya Kusuma I Made Sudana I Made Widiyarta I Nyoman Gede Baliarta Ignatius Gunawan Widodo Ignatius Gunawan Widodo Ilfiani , Pratiwi Dian Janitra, Atikah Ayu Jin Cherng Shyu Khoiri Rozi Khoiri Rozi Khoirunnisa, Hilma Kholifah, Nevita Nur Khoryanton, Ampala Khusna, Atina Nurul Komang Metty Trisna Negara Komang Metty Trisna Negara Kusuma, Mukhsinun Hadi Lily Maysari Angraini Lily Maysari Angraini Luthfiana, Nadia Tasya Ayu Made Ery Arsana Margana Margana Margana Margana Margana Margana Mariani, Dina Marliyati Marliyati Marliyati Marliyati, Marliyati Mochammad Denny Surindra Muhammad Latifur Rochman Muhammad Yunus Muhammad Yunus Muji Setiyo Mukhsinun Hadi Kusuma Mulyono Mulyono Nabila, Lathifa Dylla Nantana, Nining Rara Negara, Komang Metty Trisna Nizami, Avicenna An Nur Fatowil Aulia Nurul Qomariyah Padang Yanuar Padang Yanuar Padang Yanuar Pambudi, Yoyok Dwi Setyo Prakoso, Raden Gumilang Aji Pramesywari, Afifa Purwanto, Wawan Rachman, Iqo Yovie Rani Raharjanti Rani Raharjanti Restiawan, Muhammad Mika Ramadhani Ribka Stephani Sai'in, Ali Satito, Aryo Septiantar Tebe Nursaputro Setiawan, Trio Setiyawan, Trio Setyowati, Nur Sirajuddin Haji Abdullah Slamet Priyoatmojo, Slamet Sofia Loren Butarbutar Sofia Loren Butarbutar, Sofia Loren Sudirman Sumantri Hatmoko Supandi Supriyo Supriyo Surya Abdul Muttalib, Surya Abdul Suseno, Sigit Sutanto, Bayu Suwarti Suwarti Su”™udy, Ahmad Hamim Timotius Anggit Kristiawan Totok Prasetyo Totok Prasetyo Ulum, Muhammad Showi Nailul Wahyono Wahyono Wahyu Isti Nugroho Wahyu Sulistiyo Wibowo, Andryana Dwiandara Widodo, Ignatius Gunawan Wirza, Alif Rahman Wiwik Purwati Widyaningsih Yanuar Mahfudz Safarudin Yoyok Setiyo Pambudi Yusuf Dewantoro Herlambang Yusuf Dewantoro Herlambang Yusuf Dewantoro Herlambang Zainal Abidin Zulhan Widya Baskara Zulkarnaen Zulkarnaen