International Journal of Research in Vocational Studies (IJRVOCAS)
The International Journal of Research in Vocational Studies (IJRVOCAS) is a double-blind peer-reviewed journal. This journal provides full open access to its content on the principle that making research freely and independently available to the science community and the public supports a greater global exchange of knowledge and the further development of expertise in the field of vocational education and training (VET). IJRVOCAS is since the beginning independent from any non-scientific third-party funding. The establishment of the journal was supported between 2015 and 2016 with grants from the Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation). All members of IJRVOCAS work on an honorary basis. The journal is hosted by Ghalih Publishing and the publishing house of the Ghalih Academic. Scope IJRVOCAS covers all topics of VET-related research from pre-vocational education (PVE), initial vocational education and training (IVET) and career and technical education (CTE) to workforce education (WE), human resource development (HRD), professional education and training (PET) and continuing vocational education and training (CVET).
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<![CDATA[Simulation and Performance Test Giromill Type Wind Turbine; Case Study Muara Enim, South Sumatra, Indonesia ]]>
<![CDATA[Ovi Irawan]]>;
<![CDATA[Yohandri Bow]]>;
<![CDATA[RD Kusumanto]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.10
<![CDATA[This research examines the dynamic load resistance of the Giromill type wind turbine to the variable wind speed, which is converted to the value of the force received by the wind turbine blades. The analysis was carried out numerically using Autodesk Inventor Professional 2019 software. The variations in wind speed used were 2.5 m/s with a force value of 0.195 N for the Giromill turbine, at a speed of 3.5 m/s with a force value of 0.274 N, at 4.5 m /s with a Force value of 0.352 N and a wind speed of 5.5 m/s with a force rating of 0.430 N. From the simulation results using the Autodesk Inventor Pro 2019 software, the effect of gravitational force is greater than the wind force in, so stress analysis is mainly caused by gravity while the wind force has no significant impact. The simulation results also have a characteristic that the higher the wind speed, the lower the stress value. In addition to the dynamic load simulation, the author also tries to implement the Giromill wind turbines in Muara Enim district, South Sumatra, Indonesia. The wind turbine blade rotation will be faster, and the Wind Generator will produce a greater voltage if it is supported by sufficient wind speed.]]>
<![CDATA[The Investigation of Savonius Type and Darrieus H Type Wind Turbine Simulation with Wind Speed Variable ]]>
<![CDATA[Wibby Aditya Putra Utama]]>;
<![CDATA[Yohandri Bow]]>;
<![CDATA[M. Syahirman Yusi]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.18
<![CDATA[The demand for electrical energy that continues to increase along with the advancement of civilization and also the increasing number of people as well as the reduced level of fulfillment and availability of non-renewable energy sources, it is necessary to have renewable energy resources that capable of fulfill these energy demand in a more environmental friendly. One of the natural energies that we can use is wind energy, which is easy to get and lasts continuously. This research examines the comparison of the power generated from the vertical axis wind turbine savonius type and darrieus H type. The wind that use in this research get from from the fan. The test is doing by varying the wind speed by adjusting the fan speed. The fan is directed to the wind turbine to rotate the wind turbine. To measure the wind speed produced by the fan, a digital anemometer is used. The result of this research is the relation data of voltage to rpm and voltage to wind speed of wind turbine.]]>
<![CDATA[Pyrolysis Process of Fatty Acid Methyl Ester (FAME) Conversion into Biodiesel ]]>
<![CDATA[Bambang Irawan]]>;
<![CDATA[Rusdianasari]]>;
<![CDATA[Abu Hasan]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.21
<![CDATA[Biodiesel is a biomass fuel that can replace petroleum diesel fuel. One of the advantages of biodiesel fuel as renewable energy source that it is more environmentally friendly than fossil fuels because biodiesel significantly reduces greenhouse gas emissions compared to fossil fuels. FAME (fatty acid methyl ester) is a derivative product of CPO (crude palm oil) that has been treated both physically and chemically. The main advantage of FAME lies in the low content of impurities, especially sulphure and metal content. FAME comes from vegetable oil raw materials, which contain high enough fatty acids, around 61-62%, and nowadays, it is used as a mixture with petroleum diesel. The characteristics of biodiesel obtained from the conversion of FAME into biodiesel by pyrolysis at a temperature range of 160 – 200 oC indicate that the biodiesel produced is density 0.8475 kg/m3, viscosity 3.053 cSt, calculated cetane index (CCI) 48.5, flash point 59oC, moisture content 223 ppm, and sulphure content of 0.07% m/m. The results obtained are below the maximum limit of the specified biodiesel quality requirements.]]>
<![CDATA[Effect of Oxygen Flow Rate on Combustion Time and Temperature of Underground Coal Gasification ]]>
<![CDATA[Apriansyah Zulatama]]>;
<![CDATA[Aida Syarif]]>;
<![CDATA[Muhammad Yerizam]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.27
<![CDATA[Underground Coal Gasification (UCG) is a process of converting coal in the ground into synthetic gas that has economic value. In the UCG process which will be carried out in the UCG prototype assisted by the presence of oxygen as a gasification agent, which this gasification agent will help the process of burning coal in the ground. The flow rate of oxygen in the process of UCG affecting the coal combustion temperature and effective flame from burning coal. The highest temperature at a flow rate of 5 l/min is 240oC, at an oxygen flow rate of 3 l/min the highest temperature is 143oC and at an oxygen flow rate of 2 l/min the highest temperature is 135oC and time effective flame at a flow rate of 5 l / min ie 80 minutes, effective burning time on the speed of the flow rate of 3 l / min ie for 120 minutes and time effective flame at a flow rate of 2 l / min ie for 165 minutes. This study proves that the greater the oxygen flow rate is used as the gasification agent at UCG process the lignite coal combustion temperatures will be high and effective flame coal combustion process will be more brief.]]>
<![CDATA[Syngas Underground Coal Gasification (UCG) Testing of In-Situ Type Lignite Coal and Fracture Type Coal ]]>
<![CDATA[Julismi]]>;
<![CDATA[Rusdianasari]]>;
<![CDATA[Abu Hasan]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.42
<![CDATA[The advancement and utilization of technology require energy, namely electricity and fuel energy. The increasing cost of fossil energy, the scarcity of non-renewable energy sources and the increasing energy demand requires diversification of energy resources. One of the new renewable energy sources currently being developed in Indonesia is Underground Coal Gasification (UCG). UCG is a new technology that utilizes unmined coal. In the UCG process, coal is burned underground and the syngas produced is collected through bore wells for processing or direct use. The resulting syngas is analyzed to see the effect of in-situ type of lignite coal and fractured type of coal on syngas production using the UCG method. Tests carried out on fracture-type lignite coal for 120 minutes with a sample weight of 1.3 kg obtained a CH4 gas concentration of 0.24%, which is relatively low compared to the in-situ type lignite coal sample CH4 gas concentration of 1.13%. The CO2 concentration was 54.46% in the fracture sample, and the In-Situ type sample was 52.19%. The O2 content with a value of 19.43% for the Fracture Type sample and 4.94% for the In-Situ type sample. Fracture Type and In-situ Lignite Coal produced fewer syngas products due to UCG testing than high-rank coals such as sub-bituminous and bituminous coal. ]]>
<![CDATA[Automatic Control System for Hybrid Electrical Energy Supply Based on Internet of Things ]]>
<![CDATA[M. Edwin Syah Effendy]]>;
<![CDATA[RD Kusumanto]]>;
<![CDATA[Carlos RS]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.47
<![CDATA[The utilization of renewable energy is slowly starting to become one thing that to be interesting inside the development of science technology. The utilization of renewable energy is from at least two renewable energy (Solar Power Plants and Wind Power Plants), State Electricity Enterprise (PLN), and Generator Sources. This device could be operated automatically and integrated on the internet, which has a monitoring system such as voltage, inside which will be used to control everything inside that system. This device is designed to be operated in a combinational manner. This means to be operated based on the voltage value which qualified to activate the load. The utilization of the 3.3V microcontroller is able to design an efficient and low-cost board. Besides that, the device also uses the PLN and Generator set sources as the power backup when the main power runs out. Base on the research noted, this device will distribute the electric source to the houses, which means beneficial for the local society. This device might be applied automatically to four different sources with C++ Programming language to set the point value.]]>
<![CDATA[Automatic Cleaning System Design to Increase PV Panel Output Power ]]>
<![CDATA[Muhammad Zulfahmi]]>;
<![CDATA[RD Kusumanto]]>;
<![CDATA[Yohandri Bow]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.48
<![CDATA[The existence of the Township Housing, which is currently near the coal mine site, precisely in Tanjung Enim, South Sumatra, with a relatively open area (41 Ha) and a relatively high elevation of approximately 100 meters over the sea level, has the potential to be installed with PV panels as a solar power plant. Installation of PV panels in residential areas close to coal mining activities has the potential to indirectly generate a lot of mine dust which can reduce the amount of light received by the PV panels, which in turn can affect the output power of the PV panels. The purpose of this study is to analyze the use of an automatic cleaning system to increase the output power of PV panels by comparing the output power of PV panels produced between PV panels with an automatic cleaning system in the form of a water sprayer with PV panels that are not equipped with a water sprayer (standard PV installation). The use of an automatic cleaning system shows an increase in the average output power of 44.56 Watt. The difference between Isc PV water sprayer and normal PV is 0.5513 A. Iload measurement on PV water sprayer is 0.1973 A higher than normal PV, while for VOC PV panel water sprayer is smaller than normal PV is about 0.45 V. For PV water sprayer Vload is 0.431 V is more significant than normal PV panels. Meanwhile, for the generated load power or Pload, the PV water sprayer is 9.47 watts higher than normal PV. From all these values, the average efficiency produced by PV water sprayer is 1.81% greater than the efficiency produced by normal PV. This study shows that PV using a water sprayer produces an average output power of 44.56 watts]]>
<![CDATA[Syngas Underground Coal Gasification (UCG) Testing of Fracture Type Subbituminous Coal in Laboratory Scale: Underground Coal Gasification (UCG) ]]>
<![CDATA[Joniken Lesmana]]>;
<![CDATA[Abu Hasan]]>;
<![CDATA[Aida Syarief]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.49
<![CDATA[Underground Coal Gasification is a method used to convert underground coal seams into a gaseous product commonly called synthetic gas through a flammable chemical process without going through a conventional mining process. The UCG concept was first developed in England which was then continued by the Soviet Union in field trials of UCG which was used as a power plant. In Indonesia, Tekmira has begun to research UCG, but there are very few publications on UCG. Therefore, it is necessary to conduct research on laboratory scale UCG for analysis of gas products to support the study of renewable energy. UCG testing begins with sample preparation followed by laboratory-scale coal gasification testing. There is a sample of coal used in the test, namely Subbituminous Coal from Tanjung Enim, South Sumatra. Initial combustion is carried out by flowing propane gas into the reactor tube using a burner. Furthermore, a mixture of oxygen gas and compressed air is used to keep the coals burning. After obtaining the gas from the combustion, then gas sampling is carried out using a suction pump which will be stored in a tedlar gas bag. Combustion gas products will be checked for syngas concentration using a Gas Chromatography tool to determine the concentration of CH4, CO2 and O2 gases. From the tests that have been carried out, the gas concentrations of O2 are 3.67%, CO2 41.51%, and CH4 6.93%. Coal in the confined test conditions has good conditions with indications of seeing the concentration of CH4, O2, and CO2 gas.]]>
<![CDATA[Syngas Characteristics from UCG Gasification Process with Lignite and Subbituminous Coal Types ]]>
<![CDATA[Sarmidi]]>;
<![CDATA[Muhammad Yerizam]]>;
<![CDATA[Aida Syarif]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.50
<![CDATA[Underground Coal Gasification (UCG) is the process of converting the materials used to make synthetic gas in a feasible and economically attractive manner as a method for harnessing energy from underground coal sources. Coal gasification will produce a gas producer in the form of synthetic gas (syngas) with the main components consisting of carbon monoxide (CO), hydrogen (H2), carbon dioxide (CO2) and nitrogen (N2) and low pollutants. The highest temperature produced with MT 47 lignite coal using an oxygen velocity of 5 liters/minute was 2400 C at the 35th minute, while the lowest temperature was 950 C at the 95th minute. For Subbituminous AL 51 coal using an oxygen velocity of 5 liters/minute, the highest temperature is 3540 C at 75 minutes, while the lowest temperature is 1060 C at 130 minutes. At an oxygen velocity of 5 liters/minute the flash point / burn test is on the MT 47 lignite coal type in the 10th minute and at a temperature of 1700 C. Meanwhile, the AL 51 subbituminous coal type is in the 30th minute and at a temperature of 3130 C. Based on the discussion and analysis of data from the gasification test of lignite and subbituminous coal with variations in oxygen velocity of 5 liters/minute, the results obtained are that lignite coal burns faster (burn test) in the 10th minute at a temperature of 1700 C, in the subbituminous type it has higher temperature 3130 C and longer burn test at 30 minutes.]]>
<![CDATA[Analysis of the Performance of The Four-Blade Darrieus Wind Turbine at the Jamik Bukit Asam Mosque Complex Tanjung Enim South Sumatra: Analysis of the Performance of The Four-Blade Darrieus Wind Turbine at the Jamik Bukit Asam Mosque Complex Tanjung Enim South Sumatra ]]>
<![CDATA[Mustafa Kamal]]>;
<![CDATA[Fatahul Arifin]]>;
<![CDATA[Rusdianasari]]>
<![CDATA[ International Journal of Research in Vocational Studies (IJRVOCAS) Vol. 1 No. 2 (2021): IJRVOCAS - August ]]>
Publisher : <![CDATA[Yayasan Ghalih Pelopor Pendidikan (Ghalih Foundation) ]]>
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DOI: 10.53893/ijrvocas.v1i2.52
<![CDATA[Several types of renewable energy have been developed, such as solar energy, biomass, hydro energy, geothermal, and wind energy. Wind energy is an up-and-coming alternative and renewable energy. Wind energy is more environmentally friendly than available energy sources and has more accessible operational and maintenance costs. Indonesia has a relatively small natural wind energy potential because the wind speed in Indonesia is on average 3-6 m/s due to its location. Geographically, it is located in the equatorial area, especially the Muara Enim area, South Sumatra. This study aims to design a prototype the four-blade darrieus type vertical axis wind turbine (VAWT) needed for the utilization of wind energy which is used for Coffee Shop electricity needs at the Jamik Bukit Asam Tanjung Enim Mosque complex, South Sumatra, with the conclusion that the wind turbine, wind turbine rotation, the magnitude of the output voltage and The current generated significantly affects the wind speed in the area.]]>
