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All Journal Traksi : Majalah Ilmiah Teknik Mesin Jurnal Keteknikan Pertanian Jurnal Teknologi SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Prosiding Semnastek Jurnal Teknik Mesin JTERA (Jurnal Teknologi Rekayasa) Infotekmesin Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan)
I Gede Eka Lesmana
Universitas Pancasila
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Penggunaan Lapisan Phase Change Material Parafin Grafit Sebagai Pendingin Terhadap Efisiensi Panel Surya Polycrystalline Rovida Camalia Hartantrie; Ryann Argadiraksa; I Gede Eka Lesmana
Infotekmesin Vol 13 No 2 (2022): Infotekmesin: Juli, 2022
Publisher : P3M Politeknik Negeri Cilacap

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35970/infotekmesin.v13i2.1549

Abstract

Solar panels such as PLTS can be an alternative to complete electricity needs. However, the intensity and temperature of the sun that can not be adjusted are an obstacle to the use of solar panels. Continuous absorption of sunlight can cause solar panels to overheat. Therefore, it is necessary to cool the solar panels, therefore the heat absorbed does not exceed the capacity. Phase Change Material (PCM) paraffin graphite is one of the coolants for solar panels. PCM paraffin graphite was used to coat solar panels and then measured for voltage, current, and temperature. The results were compared with solar panels that were not covered with PCM paraffin graphite. The test results found that solar panels coated with PCM produced a lower surface temperature of 0.1458% than those without PCM. Meanwhile, the efficiency and power produced by PCM-coated solar panels were 19.496% and 0.02685% higher than solar panels without PCM, respectively, so the use of PCM paraffin graphite in solar panels can increase their efficiency.
THERMAL ANALYSIS AND PERFORMANCE OF THE PYROLYSIS FUNCTION Richard Pardomuan Sinaga; I Gede Eka Lesmana
TRAKSI Vol 22, No 2 (2022): TRAKSI
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/traksi.22.2.2022.149-161

Abstract

Biomass-fueled pyrolysis furnace is one approach to utilizing biomass as an alternative fuel and reducing the accumulation of plastic waste, where the furnace works to heat the plastic pyrolysis reactor and the oil cycle heat exchanger simultaneously. Where plastic pyrolysis produces gas to be converted into liquid fuel, and the heat in the oil cycle is used as a reference for the ORC (organic Rankine cycle) heat source in future research. Because the furnace has just been manufactured and no experimental analysis has been carried out regarding the testing method for the output product, therefore the purpose of this study is to analyze the effect of the fuel use method on the volume, quality, and efficiency of pyrolysis oil, maximum oil cycle temperature, and furnace performance. In this study, the type of plastic used is PET (polyethylene terephthalate) from used mineral water bottles that have been chopped with an initial mass of 5.2 kg and poured into a 26 kg reactor which is expected to reach pyrolysis gas at a temperature of 335°C which is then cooled by fixed bed condenser with a cooling rate of 19 liters/minute. Meanwhile, in the oil cycle using SAE 20W-50 engine oil at 1.3 liters/minute, it is expected to reach oil at a temperature above 90°C. The test was carried out twice based on the method of using the fuel, where in the first experiment using coconut shell charcoal briquettes as the main fuel with a feed of 5.0 kg/hour and LPG as a burner every 20 minutes per briquette feed, while the fuel in the second experiment only use LPG. The first pyrolysis experiment obtained 645 ml of pyrolysis oil with a density of 797-869 kg/m3 and a pyrolysis efficiency of 16.125%, while the second experiment obtained 986 ml with a density of 894-928 kg/m3 and a pyrolysis efficiency of 24.65%. The maximum temperature reached by the oil cycle was 122°C in the first experiment and 95°C in the second experiment. And the performance of the furnace in the first experiment showed that the thermal efficiency of the furnace was 38.84% and 76.59% in the second experiment.
Evaluasi Ergonomi pada Kursi Roda untuk Anak Cerebral Palsy Menggunakan Digital Human Modeling Dwi Rahmalina; Desinta Rahayu Ningtyas; Nur Yulianti Hidayah; Agri Suwandi; Dede Lia Zariatin; I Gede Eka Lesmana Lesmana; Dhidik Mahandika; Susanto Sudiro
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa dan Inovasi Volume 5 Nomor 1 Tahun 2023
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v5i1.4369

Abstract

Cerebral palsy is caused by brain damage that manifests as motor dysfunction. The most prevalent form of cerebral palsy is spastic diplegia, which causes walking difficulties. People with cerebral palsy, particularly children, require mobility aids, such as wheelchairs, to perform daily tasks. When designing wheelchairs for children with cerebral palsy, ergonomic evaluation is required to ensure that the resulting wheelchair is safe and will not pose a risk in the future. This paper investigates the use of digital human modeling to evaluate the ergonomics of wheelchairs for children with cerebral palsy. The method is used to collect samples from 5 to 18-year-old children with cerebral palsy. Digital human modeling is used to simulate and evaluate ergonomics using anthropometric data. The results obtained for the wheelchair dimensions are suitable for the 95th percentile value, while the seat length exceeds the popliteal length for the 50th percentile value. The ergonomic evaluation yielded satisfactory results for the lower back analysis parameter, and the comfort evaluation yielded satisfactory results for the 95th percentile value. In contrast, the 5th percentile value indicates knee discomfort in both the right and left knee.
Analisis Sistem Kerja Termal Heat Recovery Steam Generator pada Gabungan Siklus Rankine Organik dan Siklus Minyak Termal Dede Lia Zariatin; I Gede Eka Lesmana; Rovida Camalia Hartantrie; Farid Setyo Raharjo
SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan) Vol 2 (2020)
Publisher : SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (916.426 KB)

Abstract

Organic Rankine Cycle (ORC) merupakan pengembangan teknologi ramah lingkungan untuk memenuhi kebutuhan energi listrik. Salah satu modifikasi siklus ORC yaitu menggabungkannya dengan siklus minyak termal. Heat Recovery Steam Generator (HRSG) adalah komponen yang berhubungan langsung dengan siklus minyak termal. HRSG berfungsi sebagai tempat memanaskan fluida  kerja R134A memanfaatkan panas yang dibawa oli termal sehingga mengubah R134A menjadi uap untuk memutar poros ekspander yang disambung dengan generator sehingga menghasilkan listrik. Penelitian ini bertujuan untuk mengetahui pengaruh perbedaan temperatur terhadap kinerja termal HRSG dengan membandingkan antara hasil perhitungan simulasi CFD dengan perancangan desain HTRI.Pada simulasi CFD nilai beda temperatur oli termal sebesar 11,83 K dan R134A sebesar 46,13 K sedangkan pada perancangan HTRI nilai beda temperatur oli termal sebesar 33 K dan R134A sebesar 35,61 K. Hasil perhitungan simulasi CFD laju perpindahan panas oli termal sebesar 8,102 kJ/s dan R134A sebesar 8,062 kJ/s dengan efektivitas sebesar 55%. Pada perhitungan HTRI laju perpindahan panas oli termal sebesar 22,603 kJ/s dan R134A sebesar 6,225 kJ/s dengan efektivitas sebesar 42%. Hasil perhitungan menunjukan bahwa beda temperatur berpengaruh terhadap kinerja HRSG, semakin besar beda temperatur semakin besar nilai laju perpindahan panas, serta semakin besar pula efektivitas yang diperoleh.
Analisis Peningkatan Efektivitas Alat Penukar Kalor Tipe Plat Setelah Pembersihan Pada Sistem Oli Pendingin Turbin Fathur Maulana; I Gede Eka Lesmana
SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan) Vol 3 (2021)
Publisher : SEMNASTERA (Seminar Nasional Teknologi dan Riset Terapan)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1737.262 KB)

Abstract

Jumlah sampah selalu meningkat setiap hari mengakibatkan penumpukan di tempat pembuangan akhir sampah. Dalam upaya menanggulangi penumpukan sampah, pemerintah mendirikan Pembangkit Listrik Tenaga Sampah (PLTSa). Terdapat 4 sistem utama di dalam PLTSa, yaitu sistem penanganan bahan bakar, sistem pembakaran, sistem turbin generator, sistem pengolahan gas buang. Pada sistem turbin generator, Energi listrik yang dihasilkan generator didapat dari putaran turbin yang dihasilkan dari energi kinetic uap, untuk menjaga turbin tetap berada pada kedudukannya saat berputar maka terdapat bearing pada poros turbin. Gesekan antara poros dengan turbin menimbulkan panas sehingga dapat mengakibatkan keausan bearing. Untuk mencegah keausan, bearing dilumasi dengan oli sedangkan oli didinginkan pada lube oil cooler yang berbentuk plate heat exchanger. Setiap kurun waktu 6 bulan turbin beroperasi dilakukan proses pembersihan (cleaning) pada komponen PLTSa. Olehkarena itu, nilai evektivitas lube oil cooler sebelum dan sesudah proses cleaning perlu dianalisa guna mengetahui kenaikan performanya. Data berupa temperatur oli diambil dari pembacaan sensor RTD dan kecepatan aliran diukur menggunakan flow meter yang terpasang pada lube oil cooler. Dari data tersebut didapatkan nilai rata– rata efektivitas lube oil cooler sebelum dilakukan cleaning sebesar 16 %, sedangkan untuk niliai rata – rata efektivitas lube oil cooler sesudah dilakukan cleaning rata-rata sebesar 41%.
Co-Authors AA Sagung Sri Ratih Paramitha Agri Suwandi Alfon Dwi Pratama Napitupulu Arnold Raynold Budhi M Suyitno Camalia Hartantrie, Rovida Deni Rifki Desinta Rahayu Ningtyas Dhidik Mahandika Dwi Rahmalina, Dwi Eka Maulana Erlanda Pane Farid Setyo Raharjo Fathur Maulana Febriani Chairunisa Fikhi S. Ramadhan I Gede Yogi Dewantara Ismail, Ismail Kevin A. Sugiyanto Maria Putri Hartanto Mutiara Fadila Rania Nur Yulianti Hidayah, Nur Yulianti Reza A. Rahman Richard Pardomuan Sinaga Rovida Camalia Hartantrie Rovida Hartantrie Ryann Argadiraksa Sagita Firza Nur Susanto Sudiro Wahyu Hari Nugroho Zariatin, D.L