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All Journal Planta Simbiosa : Jurnal Tanaman Pangan dan Hortikultura TEKTAN
Subarjo Subarjo
Politeknik Negeri Lampung
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Engineering Environmental Science Immunology & microbiology Mechanical Engineering

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Modifikasi Pengering Tenaga Surya dengan Ventilator Otomatis Subarjo Subarjo; Tri Widodo; Muhammad Yusfiar Karfiandi
Jurnal Ilmiah Teknik Pertanian - TekTan Vol 7 No 3 (2015)
Publisher : Jurusan Teknologi Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25181/tektan.v7i3.866

Abstract

Radiant energy from the sun is one of the alternative energy sources to replace the role of oil as a primary energy source. Alternative forms of energy that can be used is to dry the material/material. One form of utilization of solar radiation energy is raising the air temperature. Solar collector is one example of the utilization of solar energy. Moving the hot air from the collector to the drying chamber is accelerated by a ventilator installed above ruangpengering. Dryer tool consists of two parts, solar collector and drying chamber that can directly receive the energy from the sun. Measurements were performed in this study is the temperature (T), humidity (Rh) and air velocity (v) who are outside and inside the drying chamber. Measurements were taken during the 5 days of observation starts at 11:00 until 15:00. an interval of one hour of measurement. The drying chamber reaches the maximum temperature at 11:00 until 13:00 with a temperature of 40.6⁰C while outside the drying chamber (conventional) only 39.8⁰C occurred at 12:00 hours until 13:00. kelemban (Rh) diruang dryers lower than outside the room pengring an average of 47.44% and 57.24% outside the drying chamber, the air flow in the drying chamber of 0.695 m/sec is still higher when compared with data obtained on the appliance dryer without a ventilator that is 0.195 m/sec. obtained water content (KA) end at 18.67% drying within 5 days, whereas for conventional drying KA obtained by 27.11%. Keywords: collector, ventilator, drying
Rancang Bangun Prototipe Digester Biogas Untuk Menunjang Praktikum Mahasiswa Subarjo Subarjo
Jurnal Ilmiah Teknik Pertanian - TekTan Vol 11 No 3 (2019)
Publisher : Jurusan Teknologi Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25181/tektan.v11i3.1468

Abstract

Energy is an essential requirement to support the activities and productive enterprises to produce goods and services. Almost all human activity is highly dependent on energy. Fuel shortages arise because of the level of fuel demand is very high and is increasing every year. While oil revenues are limited and membutukan earth millions of years time for formation. Due to the scarcity of fuel, causing the need of alternative energy that are environmentally become one of the necessities that can not be negotiable. The development of biogas digester technology to utilize and increase the economic value of waste is one with the road use it as raw material for biogas production. It is very suitable if to develop tool called biogas digester biogas or biogas reactor. The observation of the test digester, biogas on days 3 to 7 is not formed, even until day 14. The digester should be maintained in a state abiotis (without direct contact with oxygen; temperatures of 20-30°C). Gas began formation at day 14, and the highest gas increase at day 18 to 21, while the rate of formation of methane gas (biogas) at 13. the image that is on day 18 of 8.8 scale/cm and then on day 21 and 30 begin to decrease formation gas. the presence of the added value derived from manure waste created biogas can be used for cooking or lighting instead of electric energy. Keywords: digester, biogas, fermetation, anaerobic
Modifikasi Mesin Las Titik Portable dengan Menambahkan Dudukan dan Pedal untuk Menunjang Kegiatan Pratikum Mahasiswa Subarjo Subarjo; Tri Widodo
Jurnal Ilmiah Teknik Pertanian - TekTan Vol 12 No 1 (2020)
Publisher : Jurusan Teknologi Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25181/tektan.v12i1.1672

Abstract

Welding is one way to connect two metal parts permanently by using heat power. This heat power is needed to melt the basic material to be connected and welding wire as filler material. After it has cooled and frozen, a strong and permanent bond is formed. One way that is often recommended in this industry is spot welding. Welding point in the Lampung State Polytechnic Metal and Automotive Laboratory, the operating system is done by squatting so that it is easily tired. So with that conditions this research is modified into a table spot welding by modifying the lever with a pedal.  The objectives of this research are comparing the working time of a portable spot welding machine with a table spot welding machine using the pedal system, to get the efficiency of welding work time using a table spot welding machine using the pedal system, and to reduce work fatigue. The result showed for the pedal point table welding machine, it takes 0.512 minutes for 0.8mm plates, while for 1.0mm plates it takes 0.61 minutes, while for portable welding machines it takes 1.185 seconds for 0.8 plate thickness mm and 1,314 seconds for the 1.0 mm plate. Keywords: welding, spot welding, welding wire
Co-Authors Ajeng Aulia Martina Dulbari, Dulbari Jaenudin Kartahadimaja Muhammad Yusfiar Karfiandi Tri Widodo