INTEK: Jurnal Penelitian
INTEK is a journal managed by the Journal and Publication Development Unit of Ujung Pandang State Polytechnic, which is published twice a year, in April and October. The journal INTEK has also been indexed. The INTEK Journal accepts research scripts in the fields of technology and engineering such as: Electrical, Mechanical, Civil and Chemical Engineering.
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<![CDATA[The Impact of Changes in Exhaust Temperature on the Power Output and Heat Rate of a Gas Turbine with a Capacity of 238 MW ]]>
<![CDATA[Parapa', Hendra Budiono Putra]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.2892
<![CDATA[The exhaust temperature parameter is one of the parameters that need to be considered in maintaining the performance of the gas turbine. The purpose of this study is to analyze the effect of changes in exhaust temperature on power output and heat rate. The data used is the actual design data of the M701 gas turbine. This data is used in building the model using the GateCycle software. The modeling simulation results are then validated using the actual design data. To see the impact of changes in exhaust temperature, data from the latest gas turbine performance results are used. This study concludes that changes in exhaust temperature parameters of 1OC have an impact on changes in power output of 0.273% and heat rate of 0.047%.]]>
<![CDATA[Fatigue Characteritics of Medium Carbon Steel after Heat Treatment Using Sand as Cooling Media ]]>
<![CDATA[Sunardi, Sunardi]]>;
<![CDATA[Randu, Randu]]>;
<![CDATA[Listijorini, Erny]]>;
<![CDATA[Saefuloh, Iman]]>;
<![CDATA[Notonegoro, Hamdan Akbar]]>;
<![CDATA[Jannah, Miftahul]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.2817
<![CDATA[Stress concentrations cause many machine element failures. Failure will occur more rapidly if the machine elements obtain repeated and fluctuating loading. For this reason, the material for machine elements must have better fatigue life. There are various attempts made to increase material life and other mechanical properties. In this study, the research sample used is AISI 4140 steel. The samples obtain hardening followed by cooling and tempering. The hardening temperature is 8500C with a holding time of 17 minutes. The cooling media in this research are dry sand, semi-wet sand, and wet sand. Wet measurements based on volumetric ratios. Semi-wet sand with a ratio of sand and water 4: 1, sandy sand 4: 2. The final process is tempering treatment, with a temperature of 2500C. The material fatigue test refers to the JIS Z 2274 Standard. From this study, the heat treatment given can reduce the fatigue life of the material, even though the hardness increases. The higher the cooling rate, the hardness of the material increases, but the fatigue life is low.]]>
<![CDATA[Hybrid Electrical System Optimization of Remote Island using HOMER ]]>
<![CDATA[Mansur, Adrian]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.2962
<![CDATA[Renewable energy is an important solution in improving access to electricity, especially in isolated areas including the utilization of solar power however intermittency is becoming the main challenge that is faced in the application of Solar Power Plant (SPP). Hybrid system implementation becomes a strategy in an effort to improve system reliability based on the variation in load and intermittency of SPP. Salemo Island is one of the areas that has utilized SPP as one of the sources of electricity energy, but its operation has not been optimal as the load increases, therefore, a study was conducted to optimize the hybrid electrical system based on the current existing conditions. The results of the study showed that with the addition of SPP capacity of 200 kWp and the addition of batteries as much as 120 units, it could obtained an optimal Leveled Cost Of Energy (LCOE) value of 1,306 IDR/kWh and operating costs of 450 million with a Net Present Cost (NPC) of 8.4 billion and a capital cost of 3.2 billion. Another option is the addition of SPP 150 kWp with a lower capital cost value of 2.02 Billion, but greater than the aspect of operating cost of 883 million and LCOE of 1,897 Rp/ kWh]]>
<![CDATA[Design and Construction of Wind Turbine-Solar Panel System Prototype for Water Supply Control ]]>
<![CDATA[Yunus, A.M Shiddiq]]>;
<![CDATA[Mulyadi, Musrady]]>;
<![CDATA[Apollo, Apollo]]>;
<![CDATA[Rinaldi Wahid, Rifqy]]>;
<![CDATA[Zalsabillah, Rima]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.3015
<![CDATA[Water supply is a crucial for human lives, not only for daily activities but also for secondary purposes such as for watering garden, paddy fields etc. There are many efforts of human in fulfilling their water supply needs. Most of water supply is provided by using electric motor pumps which in certain cases might increase the financial cost. In this paper, wind energy is applied to pumping water mechanically whilst it combines with solar panel which works to pump water during less wind speed condition. The micro-controller Arduino-Uno is employed to manage the collaboration operation between wind and solar panel. The design concept and construction are presented and discussed. The operation results exhibit good operation performance and could be developed for the real application.]]>
<![CDATA[Identification of Groundwater Potential using Schlumberger Array of Resistivity Method in Bulukumba, South Sulawesi ]]>
<![CDATA[Agussalim, Agussalim]]>;
<![CDATA[AS, Nur Ichzan]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.3016
<![CDATA[The research was carried out in Bontorannu Village, Kajang District, Bulukumba Regency, South Sulawesi. The research area is a plain area with rainfed rice fields. Therefore, it is necessary to do research to identify the potential of groundwater as a source of irrigation. The purpose of this research is to provide an estimate of the plane, position, and depth of the aquifer layer in the soil based on the interpretation of measurements using the resistivity method of the Schlumberger array. Through the results of this interpretation, the pattern/contour modeling of the distribution of the aquifer layer in the soil is determined which is projected as groundwater. This research is an experimental research with a descriptive approach method. Methods of this research consists of research preparation, data acquisition, processing and interpretation of data using Res2dinv software. The measurement points were selected through feasibility survey. There are two measurement points that length of each track used is a maximum of 300 meters. The results showed that on track 1 there is a layer suspected of being a shallow aquifer with a depth of 12-22 m. While on track 2, a potential deep aquifer layer is detected with a depth of 13-25 m.]]>
<![CDATA[Kinetic Study of Adsorption Active Carbon Cassava Skin for Removal of Acetic Acid from Aqueous Solution ]]>
<![CDATA[Hartono, Tri]]>;
<![CDATA[Murdiningsih, Hastami]]>;
<![CDATA[HR, Yuliani]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.3025
<![CDATA[The amount of liquid wastes containing acetic acid found from food industry such as tofu home industry released is relatively high and pollutes water quality and also environment nearby. Several methods reducing pollutant in liquid wastes are available, one of which is adsorption using carbon as an adsorbent. The production of cassava in Indonesia was about 23.936 tons in year 2013 which produced cassava’s skin wastes about 2.393 tons. Mostly these cassava’s skin wastes containing around 59.31% carbon is disposed as garbage. This research is to develop more on reducing acetic acid containing in liquid waste by carbon active from cassava’s skin with variation of particle sizes, reaction times and acetic acid liquid waste concentrations, and also to study the kinetic reaction of cassava skin active carbon adsorbing acetic acid between Freundlich and Langmuir isotherm equations. The result shows the kinetic adsorption follows Freundlich isotherm equation with maximum capacity of  Cassava skin active carbon 0.7 mg/g at particle size of adsorbent of 0.3375 mm and reaction time of 105 minutes.]]>
<![CDATA[Development of IoT-Based Lighting Installation Practicum Module ]]>
<![CDATA[Shidiq, Ahmad Mukhaidir]]>;
<![CDATA[Purwito, Purwito]]>;
<![CDATA[Ruslan, Ruslan]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.3348
<![CDATA[With the advancement of technology today, there is known to be an innovation that is the internet of things where electronic devices can be monitored and controlled remotely. For this reason, the practicum module of internet of things-based lighting installation as a medium of learning for students. The workings of the tool will be made using the PZEM-004T sensor as a sensor reading the current voltage, power, and energy used and ESP-32 as an additional module on the Arduino Mega so that data reading voltage, current and power can be sent using the internet network to the smartphone. In the smartphone application, we can also control to extinguish or turn on the lights.]]>
<![CDATA[Identification and Analysis of Active Carotenoid Compounds From Entawak Fruit (Artocarpus Anisophyllus) ]]>
<![CDATA[Ratnawaty, Gervacia Jenny]]>;
<![CDATA[Indrawati, Ratih]]>;
<![CDATA[Syari, Jajar Pramata]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.2984
<![CDATA[— Isolation and identification of active compounds from mentawak fruit (Artocarpus Anisophyllus) used a plant determination test to determine the plant content. Furthermore, the extraction process was carried out to obtain a crude extract of carotenoid pigments by maceration method using n-hexane as solvent. Furthermore, the obtained macerate was carried out by phytochemical tests to determine the content of the active compounds. The TLC test was carried out to confirm the presence of a positive group of compounds on phytochemical screening, and to determine the chromatographic profile of the extract.  The identification results showed that the phytochemicals showed that the active compounds contained in macerate were alkaloids, flavonoids, tannins and saponins. The KLT test results obtained an Rf value of 0.875. While the total carotenoid content using a spectrophotometer UV-Vis is 958 µg/ml.]]>
<![CDATA[Designing and Manufacturing of Grain Dryer Machine using Coconut Shell Fuel as an Alternative Heat Energy ]]>
<![CDATA[Dermawan, Dermawan]]>;
<![CDATA[Nur, Rusdi]]>;
<![CDATA[Susanto, Tri Agus]]>;
<![CDATA[Amrullah, Amrullah]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.3351
<![CDATA[Many problems in the process of drying grain with a solar heat source. One of the factors is the erratic weather, where the rainy season comes along with harvest time. To overcome these obstacles, a grain dryer was designed that uses a rotary system that is simpler and more efficient and uses coconut shells as an alternative fuel. This study aims to obtain fast and affordable grain drying results by farmers using a rotary system dryer with coconut shell fuel. The benefit of this research is to provide an alternative solution for the community in dealing with harvesting in the rainy season by reducing land for drying grain. Equipment preparation was carried out in particular by using standard equipment to cut and connect the seat frame including the use of silencers and gasoline-fueled motors as propulsion and other supporting equipment. The components of each unit of grain drying machine are assembled and tested in stages according to procedures and functions. The test results show that the use of coconut shell can reach drying temperatures faster than the use of LPG, coconut shell fuel is better at reducing the moisture content of grain than the use of LPG. Testing of coconut shell fuel is done by drying 30 kg of grain for 20 minutes and 15 minutes. It can be concluded that the use of coconut shell as an alternative fuel can achieve a faster drying temperature than the use of LPG fuel. The use of coconut shell fuel to dry 30 kg of grain and reach a moisture content of up to 12% requires an effective time of 15 minutes.]]>
<![CDATA[Inrush Current Based on Fast Fourier Transform ]]>
<![CDATA[Zamzami, Mochamad Ilham]]>;
<![CDATA[Prasetyono, Eka]]>;
<![CDATA[Anggriawan, Dimas Okky]]>;
<![CDATA[Yuliana, Mike]]>
<![CDATA[ INTEK: Jurnal Penelitian Vol 8 No 2 (2021): October 2021 ]]>
Publisher : <![CDATA[Politeknik Negeri Ujung Pandang ]]>
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DOI: 10.31963/intek.v8i2.2940
<![CDATA[Advances in technology have caused the use of electricity to increase rapidly. With advances in technology, this is followed by the use of increasingly efficient electrical components or equipment. This more efficient electrical equipment causes the impedance of the component to be smaller, causing a surge in current when it is turned on. This current surge, if not followed by appropriate safety precautions, will be damage other components. Each load has different waveform characteristics and current transient peaks. For this reason, it is necessary to analyze the transient condition of a load to overcome this. This paper will explain the characteristics of the inrush current of the load due to ignition. There are three loads used in this study, namely resistive, capacitive and inductive loads. Then the use of this load is simulated by giving different ignition angle values, namely 0, 60, and 90 degrees. The analysis used is the Fast Fourier Transform (FFT) method which is a derivative of the Discrete Fourier Transform. The inrush current spectrum in this simulation is simulated using Simulink MATLAB with switching system modeling using TRIAC. This inrush current simulation data collection uses a sampling frequency of 100 Khz and will be analyzed in the first of 5 cycles. For each load in this paper, the harmonic values for each ignition angle will be presented. The simulation results show that the inrush current is caused by the ignition angle value used and because of components that can deviate energy such as inductors and capacitors as well as components which at the time of starting have a low impedance value such as incandescent lamps. The simulation also shows that the use of switching components for setting the ignition angle causes an increase in the value of Total Harmonic Distortion (THD) but the peak current in the first cycle when the ignition angle is set decreases.]]>
