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Homzah, Ozkar F
Politeknik Negeri Sriwijaya
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PENGARUH VARIASI UDARA MASUKAN TERHADAP UNJUK KERJA PORTABLE MINI DEHUMIDIFIER Ozkar F. Homzah; Hermanto Hermanto
Machine : Jurnal Teknik Mesin Vol 3 No 2 (2017): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (506.545 KB)

Abstract

Abstrak Sebuah hasil rancang-bangun dirancang-bangun untuk mendinginkan lalu sekaligus mengeringkan udara atau disebut dehumidifikasi. Hasil rancang-bangun ini menggunakan termoelektrik sebagai komponen utama dalam dehumidifikasi. Penelitian ini dilakukan dengan mengkaji kinerja sebuah portable mini dehumidifier menggunakan teknologi termoelektrik dengan variasi udara masukan terhadap nilai COP (coefficient of performance) atau unjuk kerja dari modul termoelektrik yaitu TEC1-12706. Penelitian ini dilakukan untuk empat waktu variasi udara masukan yaitu pada pagi hari (pukul 07.00-10.00 wib); siang hari (pukul 12.00-15.00 wib); malam hari (21.00-24.00 wib); dan set-point (set-temperatur 24 oC) untuk rerata setiap 15 menit pengambilan data. Hasil penelitian menunjukkan bahwa heat-sink untuk sisi dingin dapat mendinginkan temperatur udara masuk sebesar 5.40 oC pada kondisi rerata set-point, serta pendinginan terkecil hanya 2.23 oC pada kondisi rerata siang hari. Dari hasil penelitian juga didapat koefisien kinerja atau COP terbaik dari sisi panas heat-sink termoelektrik pada kondisi set-point yaitu 1.64 dengan menurunkan (dehumidifier) kelembaban udara masuk dari 59% menjadi 27.08%, sedangkan pada kondisi malam hari kinerja sisi panas heat-sink mengalami penurunan menjadi 1.48 dikarenakan kelembaban udara produk dihasilkan mencapai 43.23% dari kelembaban udara masuk yaitu 95.77%.
DESIGN OF AUTOCLAVE FOR FRESH SHRIMP STERILIZATON PROCESS USING FINITE ELEMENT ANALYSIS Hendri Chandra; Jusran Abdi; Ozkar F. Homzah; Hasan Basri; Ikbal Azhari; Nurhabibah Paramitha Eka Utami
AUSTENIT Vol. 14 No. 2 (2022): AUSTENIT: October 2022
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v14i2.5676

Abstract

Chloramphenicol is one of antibiotic compound which is an additional ingredient that is forbidden to be used in food products, especially in fresh shrimp product export. To avoid the used of preservative, then required sterilization process in a physical way which is vaporization using a high-pressure supercritical carbon dioxide (CO2). One of sterilization process for supercritical carbon dioxide is using autoclave media. Autoclave is a closed heating device used to sterilize or reducing a substance or object that is disserve by using high temperature and high pressure steam. In designing and constructing autoclave, the first step to be done is to define the function and the operation capacity. The function and capacity will determine the initial dimension of autoclave as well its working pressure and temperature. In this study, the autoclave was designed with quantitative methods and modeling using software Autodesk inventor 2016 based on finite element method. The given load is in the form of supercritical carbon dioxide pressure of 73.83bar and temperature of 31.30C. Based on the result of design, quantitative methods gives the safe result and optimized thickness needed autoclave usage.
STUDI PERFORMASI SUDU TURBIN ANGIN SAVONIUS TIPE VERTICAL AXIS BERBAHAN KOMPOSIT Ozkar F. Homzah; Ella Sundari; Rachmat Dwi Sampurno; Ogi Meita Utami; Lily Rahmawati
Machine : Jurnal Teknik Mesin Vol 9 No 1 (2023): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v9i1.3317

Abstract

The increasing human population, the use of fossil energy such as oil also increases. While fossil energy is one of the largest contributors to carbon emissions that can cause climate change that can be done to control climate change is to switch to the use of renewable energy. The investigation takes the shape of a vertical axis Savonius turbine blade design. The blades are made of a composite material called carbon fiber, and the number of blades varies between 4, 6, and 8 pieces. The study's findings were tested utilizing a blower-generated wind source with wind speeds of 4m/s, 4.5m/s, and 5m/s. A wind tunnel consisting of acrylic material and pipes as a frame construction was used in the test. The test findings show that turbine blades with a total of four blades produce the maximum generator power of 0.274 watts at a wind speed of 5 m/s. Meanwhile, the turbine blade with 8 blades has the lowest output power at a wind speed of 4 m/s and a power value of 0.0028 W. Then, with 8 blades, it has a relatively low output energy compared to 4 and 6 blades. Therefore, the highest efficiency performance of wind turbine use is achieved by a turbine with a number of 4 blades with a maximum efficiency is 9,16% and the minimum efficiency it seen in a wind turbine with a number of blades 8 within 0,07%.
ANALISA KERUSAKAN PIPA DUCTING SCRUBBING BERBAHAN CARBON STEEL SS400 DI PABRIK PUPUK NPK-1 PT PUSRI PALEMBANG Perez Nasrah; Ozkar F. Homzah
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.6684

Abstract

The purpose of this research was to discover the various reasons of failures and appropriate repair options for the line ducting cleaning unit system at PT Pusri Palembang's NPK-1 production facility. The main cause of the failures was determined to be a deterioration of the ducting line material caused by corrosion on the inner side of the ducting pipe composed of SS400 carbon steel. We made investigation including an analysis of the thickness of the damaged ducting pipe, as well as a visual check. The investigation showed that the corrosion caused an average drop in pipe wall thickness of up to 70%. The fixed load superimposed on the ducting pipe and the carrying capacity of the piping affect ducting strength, but corrosion on the inner surface of the pipe, caused by direct contact with corrosive and hygroscopic process dust, reduces ducting wall strength against axial and lateral loads. A Failure pipe caused losses and unscheduled shutdowns of production process, will be increased the repair costs and increases the risk of human accidents. The suggestion of investigation results is to upgrade the ducting pipe materials to knowed corrosion-resistant materials, such as stainless-steel grade SS304. Also, should be taken is also regularly to inspect the ducting cleanness for the internal of ducting and control the dust flow rate through the scrubbing system. As conclusion, the suggestions given are to mitigate the risk of corrosion impact by maintaini­­­­­­ng ducting strength within the minimizing ducting system failures and ensuring the NPK plant's operation reliability.
ANALISA PERAWATAN INTAKE PUMP DENGAN MENGGUNAKAN METODE RISK BASED MAINTENANCE (RBM) Ozkar F. Homzah; Ella Sundari; Rizky Brillian Yuliandi; Femi Permata Sari
Machine : Jurnal Teknik Mesin Vol 9 No 2 (2023): Machine : Jurnal Teknik Mesin
Publisher : Jurusan Teknik Mesin Fakultas Sains dan Teknik Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jm.v9i2.4352

Abstract

Intake Pump is one of the important equipment in the steam power plant of 3x10 MW electrical generator which functions to supply raw water to production of demin water, domestic water and service water. In the process of producing water through the intake pump there are several components of the intake pump that often experience damage, this can be a loss for the company, therefore requiring additional processing. In this study, the Risk Based Maintenance (RBM) method was carried out to achieve optimal maintenance by knowing the impact and risk of failure according to important intake pump components, namely impeller, bearing and shaft. Based on the analysis results of the RBM calculation, the consequences of risks accepted is low to 0.05% by the company that achieved to 221,498,196.507 Indonesian rupiah it’s to 0.13% of production capacity per year. This value exceeds the acceptance risk tolerance of 0.13% which has become a company provision. Therefore, it is necessary to plan the proposed maintenance period from the existing policy, which is carried out 48 times a year for each critical component such to reducing the number of consequences and risks to 198,002,597 Indonesian Rupiah or equal to 0.01%.
Co-Authors Almadora Anwar Sani Ambo Intang Anggoro Tri Prakoso Ayu Margareta Baiti Hidayati Beta Akui Didi Suryana Dodi Tafrant Ella Sundari Femi Permata Sari Gilang Saputra Hariadi, Sofwan Haryanto . Hasan Basri Hendradinata, Hendradinata Hendri Chandra Heriyanto Rusmaryadi Herlin Sumarna Hermanto Hermanto Ikbal Azhari Irnanda Pratiwi Iskandar Ismail Jusran Abdi Kaprawi Sahim Kodri Hudiya Utama Lily Rahmawati M . Lazim Mahendra Mahendra Mahmud Basuki Muhammad Adrian Muhammad Rasid Rasid Nurhabibah Paramitha Eka Utami Ogi Meita Utami Perez Nasrah Permatasari, Rosmalinda Prakoso, Anggoro Tri Pramadhony Pramadhony Rachmat D Sampurno Rachmat Dwi Sampurno Rachmat Dwi Sampurno Rachmat Subekti Rizky Brillian Yuliandi Septian Saputrah Sofwan Hariadi Suhardan . Suhardan, Suhardan Suparjo Suparjo Suryani, Faizah Syamsul Ma’arif Wahyu Adjie Pangestu Willy Alexander Yundari, Yundari