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Analisis Konservasi Energi Gas Suar Bakar Pada PT. Arun NGL

Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
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One of the major issues facing the world today is global warming. This problem is caused by the increasing concentration of carbon dioxide and other greenhouse gases in the atmosphere. A suggested method for controlling the level of greenhouse gases in the atmosphere is the prevention of burning flaring gas unit. In this study, two methods are proposed to conserve flaring gas at liquefied natural gas refineries PT. Arun. This method aims to minimize the environmental and economic losses of flaring gas combustion. The proposed method are: 1) utilization of flared gas as fuel for gas turbine power generation and 2) compression and injection of boiled gas into the refinery pipe. Determination of the most suitable methods and tools required for the two methods was done by means of simulation. The simulation was designed to determine the potential power generation and compression power required. The results demonstrate that the use of flared gas as fuel can generate 2130 MW of electricity while requires a compressor with a maximum pressure of 129 bar to inject the flaring gas into the refinery pipe. Study of economic analyzes for both methods was also conducted. From the analysis, it is found that compression of gas into the pipeline requires a lower capital cost than if the gas is utilized as gas turbine fuel. Therefore, the gas injection into the refinery pipe is a suitable alternative to prevent adverse environmental impacts through large amounts of carbon dioxide emissions in the atmosphere due to flaring gas burning.

Analisis Kenyamanan Thermal pada Gedung Gelanggang Mahasiswa Prof. A. Madjid Ibrahim Universitas Syiah Kuala

Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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Student center building Prof. A. Madjid Ibrahim who has been reconstructed back in use as a meeting hall with a capacity of 500 people, but the results showed that the temperature in the room is empty conditions at 13:00 pm 32.7 0C, humidity 61%. The time charged 30 people occupants temperature during hours the same 33.5 0C, humidity 60%. While over 100 people filled the temperature at the same time at 34.4 0C, 57% humidity, and wind speed to the three conditions is 0 m / s. From the results of research on different floors 1 and 2 indoor temperature difference measured at 09.00 pm with the comfort standard is 2.2 0C obtained under thermal comfort in the building arena student Prof. A. Madjid Ibrahim is not achieved because the temperature of indoor air temperature outside the comfort standard SNI T03-6572.

Karakterisasi Material Penyimpan Kalor Laten Menggunakan Metode T-History

Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
Publisher : Jurnal Teknik Mesin Unsyiah

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The capacity of energy storage and temperature storage has come into consideration in choosing thermal energy storage system. Absorbed or released material either big or small can be determined by finding the value of the specific heat (Cp) and the latent heat fusion (HL). Available method to determine latent heat of fusion (H), specific heat (Cp), temperature melting (Tm) and thermal conductivity (k) are conventional calorimetry method, Differential Thermal Analysis (DTA) and Differential Scanning Calorimetry (DSC). Measurement of physical properties of phase change material using DTA and DSC has disadvantage due to small weight that used for sample (1-10 mg), so that thermophysic of sample usually different when the material is used in large quantities. In this study, T-history method is used to determine thermophysic heat storage material. Examination results show the match value in latent heat (Hm) of paraffin with DSC testing results are 249.42 KJ / kg with 251 KJ / kg. The results of calculations using the T-History for paraffin obtained at temperature Tm 52.72 to 59.9 0C; Cp of 2.54 to 3.57 KJ / Kg.K; Hm at 249.42 KJ / Kg; k of 0, 18 W / mK. For bee-wax Tm obtained at temperatures from 52.4 to 61.79 0C; Cp of 2.65 to 3.45 KJ / Kg.K; Hm of 171 KJ / Kg; k of 0.234 W / mK. For fat cow obtained at temperature Tm 40.82 to 44.10C; Cp of 3.19 to 4.16 KJ / Kg.K; Hm at 60.13 KJ / Kg; k of 0.181 W / mK. It can be concluded after examanination that Paraffin is a good material as a phase change material (PCM) in comparison to bee-wax and beef fat.

Kaji Sistem Peralatan Penyerap Kalor pada Kotak Penyimpan Darah

Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
Publisher : Jurnal Teknik Mesin Unsyiah

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This research aims to produce an effective heat sink with thermoelectric which is a semi conductor devices having several pairs of type P (positive) and N (negative) S content. Type P has a lower energy level while type N had a higher energy level. This tool, equipped with a heat sink as the heater, is mounted on a chamber to create a heat exchanger for a portable cooler box. Three types of thermoelectric modules were used with different fin types to find out the their effects on the temperature, T, and the rate of heat transfer, Q, inside the cooler box. The results shows that with the blood volume of 250 cc, the blood temperature can be decreased from 29 oC to 5.8 oC within 145 minutes. The ideal temperature for the blood storage ranges from 1 oC to 6 oC. Among the three types of fins that were tested, the most effective heat transfer was given by fin type no. 3, the cylindrical-shaped fins. The heat transfer obtained is 12.83 W/m2 oC. The lowest heat transfer was given by fin type no. 2, which is a slot type, with heat transfer rate of 3.85 W/m2 oC.

Kaji Ekperimental Karakteristik Pengeringan Ikan Bandeng Pada Alat Pengering Berbahan Bakar Gas

Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
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Aceh is one of the biggest milkfish (chanos-chanos Forsskal)-producing provinces in Indonesia and the production is increasing year by year. However, beyond that prospect, there are disadvantages of the milkfish which are able to be putrid easily and are not able to be kept for a long time. In addition, at the time of great harvest and the fish production is plenitude and less of the fish is in use that the price of the fish decreases sharply. The population of Aceh generally like to consume fresh and dried milkfish especially the people in the rural and highland. Based on the result of the previous research, the drying method which is done by putting the fish under direct sunlight is inefective as the sunlight is not perpetually present as expected. Even the quality of the product is low as the fish is contaminated by flies. In addition it requires large drying areas to produce large quantity fish. In this research, it is conducted eksperimental analysis and drying characteristic of the milkfish in the drying process by using drying equipment with gas fuel. The drying equipment used is the shelf type which is located in Thermal Engineering Laboratory, Mechanical Engineering, Engineering Faculty, Syiah Kuala University. The equipment consists of burning room, drying room and chimney. The weight of  milkfish model is 200 grams, 250 grams, and 300 grams. Based on the test result on the milkfish weighted 200 grams after the drying process, it can be seen that the content of protein 18,97 %,fat 3,75%, water 19,20% with the total drying process of six hour.

Analisis Unjuk Kerja Kompresor Sentrifugal Pada Unit Flare Gas Recovery PT. Arun NGL

Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
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PT. Arun NGL has made various efforts torecover losses of energy and water resources during the production process. One of the main focuses for energy conservation is flare gas recovery unit. The flare gas recovery system proposed is skid-mounted type. The primary equipments consists of two compressors that compress the gas from the flare header gas upstream liquid seal drum. The gas is then cooled for reuse in the fuel gas system. The flare gas compressor often experience surge problem due to compressor operating at low flow so that the pressure decreased dramatically while compressor head system stays at high pressure. The compressor playsan important role in generating high-pressure fuel gas. If the compressor is not able to produce enough pressure as required, the production of fuel gas will be disrupted.This analisis focused on the calculation the compressor performance, head, capacity efficiency, and compressor power. Based on the analisys, it is obtained that the flow capacity is 3500 m3/hr, head compressor is 5700 kJ/kg, and the compressor power is 9000 kW. The results show that the operating condition is still whitin the surge limitation.

Simulasi dan Pengukuran Unjuk Kerja Sistem Pompa Air-Energi Surya Untuk Kota Banda Aceh

Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
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The use of electrical energy to supply either clean water or water for agricultural purpose persistently to increase in line with the population growth. The primary objective of this study is to conduct a feasibility study of the utilization of solar energy for driving pumps in Aceh Province, to perform computer simulations for designing solar energy water pump system, and to measure the performance of the small scale solar energy water pump system. The analysis result shows that the potential of solar energy in Aceh Privince can be used to drive the pump for irrigation and clean water for the needs of the community. The performance measurement result shows that the 50 Wp PV panel is capable of driving the pump with 60 Watts of power for 4-5 hours, on a cloudy day, and 8-10 hours on a sunny day.

Optimasi Penyerapan Panas Memanfaatkan Energi Matahari pada Kolektor

Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
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Solar energy is a renewable energy that can be utilized for human needs for various purposes such as electricity, heating, hair, and so forth. Solar collector is a device that collects solar energy and converts it into thermal energy and redirects the energy back into the fluid. Three variations of barrier angle were prepared in order to optimize the absorption of solar energy in a collector. Multiple pass turn were utilized to maximize the heat absorption. The size of the collector is 250 cm × 85 cm. Each side of absober box is coated with aluminum of 10 mm thick. Iron sand is used as absorber with thickness of 6 m. The collector box is tilted with 15° angle. Measurements were carried out for each multiple pass turn angle ; 130°, 180° and 90°. The tests were carried out in an open field in front of the Faculty of Engineering, Syiah Kuala University. The results show that temperature tends to be similar for all three variations of barrier angle. For the barrier angle of 130°, the highest temperature achieved was 93.3°C during 12:00 to 13:00 pm. The highest temperature achieved for the other two variations are 91.2°C for the barrier angle of 90° and 90.2°C for the barrier angle of 180°.

Kaji Eksperimental Perpindahan Panas Peleburan Parafin Sebagai Material Penyimpan Panas pada Alat Penukar Kalor Bersirip

Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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In this research, experimental study is conducted related to the latent heat transfer and thermal energy storage using finned tubes. An experimental unit consisted of data acquisition, the heat exchanger shell and tube were used to improve heat transfer. The fluid heat pipe was designed in longitudinal fin and radial fin. Paraffin wax was used as a thermal storage medium. The characteristics of heat transfer from fluid to paraffin wax is investigated in different heat flux conditions. The experimental results show that the heat transfer characteristics show similarities to the heat exchanger tubes. In the preheating process, it is dominated by conduction, but at the melting temperature of the heat transfer, it is dominated by convection. The use of longitudinal finned pipe has been able to increase the heat transfer rate.

Evaluasi Pembangkit Listrik Tenaga Angin Kecepatan Rendah Sebagai Penggerak Refrigerator Es 300 Kg/Hari Untuk Nelayan

Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
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Generally, the fishermen in the fishing village of Lancang only 20 trips/month of the year. The average total amount of ice required for the first type of fishing boat is 300 kg ice/day and 150 kg of ice/day for both types of fishing vessels. So, based on the total number of observations of ice demand data is 9000 kg/month (300 kg ice/day). One solution that can be taken is the utilization of wind energy resources owned by the village to generate electrical energy as the driving engine refrigerator. Methods of research conducted in three phases, the first stage is filled with wind potential measurement, processing and analysis of wind speed data. In the second stage of the development of modeling performed to evaluate the performance of Genesis turbines based on the data load and wind potential. The third stage is filled with measurements of 10 KW wind turbine performance and then made ​​comparisons with modeling results. From the analysis of wind speed data obtained from the measurement results obtained by the average wind speed reaches the village of Lancang 3-5 m/s at a height of 15 m above sea level. Based on analytical results obtained using the software Homer wind turbine energy production is 7.474 kWh/year and the results of measurements of overall performance of the turbine can be concluded that wind turbines are the object of study is only able to deliver an average power 3-7 KW.