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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%.
Exploratory Factor Analysis for Developing Wheelchairs for Children with Cerebral Palsy Dwi Rahmalina; Desinta Rahayu Ningtyas; Nur Yulianti Hidayah; Agri Suwandi; Dede Lia Zariatin; I Gede Eka Lesmana; Dhidik Mahandika; Susanto Sudiro
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 7 Number 1 (2025)
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v7i1.7769

Abstract

A wheelchair is an essential mobility tool for individuals with limitations, including children with Cerebral Palsy (CP). Cerebral palsy affects children under five and causes stiffness in various body parts. The design of wheelchairs for children with CP differs significantly from standard wheelchairs, prompting this research to identify the key factors that should be considered in designing such wheelchairs. This study used exploratory factor analysis, data was gathered from children with CP and their caregivers in Java. The findings revealed six fundamental factors to consider when designing wheelchairs for children with CP: Main features, Ultimate comfort, standard compliance, robust durability, thoughtful ergonomics, unique special features, user-friendly design, and aesthetic appeal. In summary, while the main features are crucial in the design of wheelchairs for children with CP, it is equally important that these wheelchairs comply with applicable standards and incorporate special features tailored specifically for these young users.
PENGARUH JENIS TERBANG TERHADAP KONSUMSI BAHAN BAKAR PESAWAT KING AIR B200 AA Sagung Sri Ratih Paramitha; I Gede Eka Lesmana
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 2 Nomor 2 Tahun 2020
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v2i2.1374

Abstract

Saat ini, pemanfaatan pesawat udara dalam moda transportasi semakin meluas, tidak hanya mengambil peran sebagai media untuk transportasi penumpang, tetapi juga digunakan sebagai media untuk melakukan uji kalibrasi terhadap navigasi pendukung keselamatan penerbangan. Uji Kalibrasi di lakukan dengan membawa alat uji di dalam pesawat yang digunakan dan melakukan prosedur untuk mengkalibrasi navigasi penerbangan termasuk manuver yang dibutuhkan. Pemanfaatan pesawat yang biasanya di gunakan untuk melakukan ferry dengan fungsi kembali ke base untuk melakukan perawatan pesawat atau membawa penumpang dari satu daerah ke daerah lain. Pesawat dengan tipe dan interval waktu penggunaan yang sama akan memiliki perbedaan konsumsi bahan bakar apabila digunakan dalam jenis pemanfaatan terbang yang berbeda. Hal ini dapat dilihat dengan melakukan uji ANOVA dan t-test menggunakan SPSS. Saat dilakukan uji dengan SPSS didapatkan hasil uji t-test menunjukkan nilai Signifikan atau Sig. sebesar 0,002 sehingga hipotesa adanya perbedaan konsumsi bahan bakar saat melakukan ferry dan kalibrasi dapat di terima. Sehingga perlu di lakukan penjadwalan terbang yang baik agar setiap pesawat dapat memasuki masa perawatan rutin yang sesuai dengan waktu yang ditentukan.
Analisis Pengaruh Turbine Washing Terhadap Efisiensi dan Daya Pembangkit Turbin Uap Sagita Firza Nur; I Gede Eka Lesmana
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 3 Nomor 2 Tahun 2021
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v3i2.2094

Abstract

The steam turbine is one of the main components in the Geothermal Power Plant which acts as the prime mover is used to convert heat energy in steam into rotation energy. At PLTP X, steam is used to drive the turbine is in saturation conditions. The principle of the steam turbine is dry steam plant cycle. From July to August, it was known that there have been several decreases in generating power at Unit 2 at PLTP X. The efforts that can be done to overcome this problem is by turbine washing. This study aims to compare the performance of steam turbines based on thermal efficiency, isentropic efficiency and steam turbine generator power before and after turbine washing from the calculation results based on CEI/IEC 953-1, CEI/IEC 60953-3 and ASME PTC 6-2004 standards using the actual steam system operating parameter data collection, interviews and analysis. So that it gets an average increase in isentropic efficiency of 0,0564 %, thermal efficiency of 0,0082 %, the actual power generation of steam turbine is 162,72 kW and the largest power generation reaches 54.500 kW after the turbine washing steam rate of 7,5963 kg/kWh and the turbine heat rate of 3.607,3453 kJ/kWh.
Analisis Kinerja Motor Terhadap Kerusakan Kompresor Tipe B – 304 pada LRT Jakarta Seri 1100 Wahyu Hari Nugroho; I Gede Eka Lesmana; Rovida Camalia Hartantrie
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 4 Nomor 1 Tahun 2022
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v4i1.2429

Abstract

Compressor is one of the energy conversion machines that has a function to compress or compress the working fluid, in this case compressible fluid. To maintain the reliability of components carried out maintenance including periodic maintenance and maintenance when there is damage, in this final task obtained data on the 71st weekly maintenance obtained compressor is not able to supply air optimally. Output power obtained output power of 61,475 kW, while in data processing obtained the largest output power obtained by 85.6 kW large output power based on high current input due to excess load on the motor. The amount of output power that exceeds the maximum output power results in a fracture in the piston rod. And get a filter that has been dirty on the compressor so that the air can not be compressed to the maximum.
Analisis Pengaruh Getaran Pompa Terhadap Aliran Fluida pada Proses Pemipaan Skala Laboratorium I Gede Eka Lesmana; Febriani Chairunisa; Maria Putri Hartanto; Rovida Camalia Hartantrie
Jurnal Asiimetrik: Jurnal Ilmiah Rekayasa Dan Inovasi Volume 4 Nomor 2 Tahun 2022
Publisher : Fakultas Teknik Universitas Pancasila

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/asiimetrik.v4i1.3461

Abstract

Piping installations are generally used to drain fluids with the help of tools such as pumps. The pump motor causes a high enough vibration so that if it is connected to a piping installation it can cause vibrations in the pipe. If the vibration generated by the pump against the pipe is strong enough, it can cause problems such as misalignment, and others. To identify the resulting vibration. In this study, using variations in the diameter of the pipe and variations in the distance of the blockage in the clogged pipe. Variations in the diameter of the pipes used are ½”, ¾”, 1”, 1 ¼”, dan 1 ½”. And the variation of the distance of the blockage on the pipe that is plugged is 196.5 cm, 206.5 cm, 216.5 cm, 226.5 cm, and 236.5 cm. The comparison of the value of the vibration velocity becomes a reference to determine the diameter of the pipe that is suitable for installation and to find out that the clogged pipe can flow fluid. Based on the results of this study, a pipe with a diameter of ½”has the highest vibration velocity value of 6.1 mm/s and a pipe with a diameter of 1 ½” has the lowest vibration velocity value of 0.82 mm/s and in the condition of a clogged pipe the value is 1, 04 mm/s and the average value of the vibration velocity in the pipe under normal conditions is 0.7 mm/s.
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