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Jurnal Teknik Mesin Unsyiah
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Articles 70 Documents
Analisis Konservasi Energi Gas Suar Bakar Pada PT. Arun NGL Ash'ari, Erwin; Syuhada, Ahmad; Hamdani, -
Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
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Abstract

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.
Kaji Eksperimental Perpindahan Panas Pada Lemari Penyimpan Darah Portable Dengan Memanfaatkan Efek Peltier Sary, Ratna; Mubarak, Amir Zaki
Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
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Abstract

The process of blood storage is the important part in maintaining the blood quality. After it is donated by the donor, the blood will be stored in a storage cabinet until it is needed by the patient. One of the common ways to preserve and maintain the chemical and structural changes of the blood is to store it in a storage area that has a temperature of between 1-6 °C. Blood storage cabinets that already exist this days, use the vapour compression cycle which is only suitable for the storage of large capacity and is not portable if there is blood demand in remote areas. To answer these problems, in this research will be designed and manufactured portable blood storage cabinet by the size of 30 cm x 30 cm x 30 cm. The heat in the storage is discharged to the air by using a heat pump which works using thermoelectric cooler (Peltier effect). The Peltier effect occurs when two metals or semi-conductors of different materials are connected and energized that there will be a difference in temperature. In order to test the feasibility of the blood storage cabinets technically, the heat transfer study is conducted. The experimental result shows that the expected temperature is achieved.
Analisis Kenyamanan Thermal pada Gedung Gelanggang Mahasiswa Prof. A. Madjid Ibrahim Universitas Syiah Kuala Zulfadli, Teuku; Syuhada, Ahmad; Fuadi, Zahrul
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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Abstract

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.
Pengaruh Komposisi Paduan Al-Si Terhadap Kerentanan Hot Tearing Akhyar, -; Suyitno, -
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
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Abstract

Hot tearing and hot cracking is a metal alloy casting product defects caused by several factors such as alloy composition, casting temperature, mold temperature, mold shape and even casting system itself. The study has been developed to find the phenomenon of the hot tearing by varying the alloy composition, techniques and methods. Increasing Si alloy composition can improve hot-tear, mold modification CRCM (constrained Rod Casting Modified) Horizontal method can be used to analyze the hot tearing. The material used is aluminum with Si composition is 0.24pwt as base and material ADC12 as additive with Si composition is 10.56pwt to increase Si composition. Hot-tearing sensitibility value obtained by using the equation then showing into the chart HTS footprint. HTS values ​​for Si alloy with a composition of 0.24pwt is 12 and the HTS value for alloys with compositions 1.05pwt Si is 18. Cracks formed in the product starting with the smooth (hairline cracks) category to the complete (specimen broken) category. The higher Si content can increase the cracked in product castings, so that the higher Si composition more tendency to tear.
Perancangan Pompa Hidram Head Rendah Menggunakan Pemograman Visual Basic Maulana, Muhammad Ilham
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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Abstract

A hydraulic ram pumps, or shortly known as a hydram, is a water-lifting device that operates automatically and continuously. It is a device that uses the energy in the flowing water such as spring, stream or river to pump part of the water to a height above that of the source. With a continuous flow of water a hydram operates continuously with no external energy source. Hidram pump design influenced several input parameters such as head, inlet pipe diameter and yield parameters: length of inlet pipe, heavy weight exhaust valve, the inflow speed, output flow rate and efficiency of the pump. In this study, the analysis is done using visual basic 6.0 computer program, as well as completion of the problem in terms of design of the hydram pump. The performance results are then compared with the experimental results. This program aims to ensure that everyone can design and make the hidram pump, with still follow the general rules of the proper design.
Karakterisasi Material Penyimpan Kalor Laten Menggunakan Metode T-History Muzakir, Ully; Hamdani, -; Syuhada, Ahmad
Jurnal Teknik Mesin Unsyiah Vol 1, No 2 (2012)
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Abstract

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.
Simulasi Pengaruh Diameter Poros dalam Analisis Rotordinamik Mubarak, Amir Zaki
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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Abstract

Vibration analysis of rotor system has been widely performed by numeric method along with the development of computer technology. By the use of the technology, the analysis of the dynamic characteristic of a rotor system has been investigated. The objective of this study is to investigate the influence of shaft diameter to the dynamic characteristic of a rotor system. The investigation is conducted by using computer program simulation. The study is conducted for four system rotor models with a variation of number of disks. Each model has one rotor shaft which is numerically divided into several line elements. The simulation result shows the natural frequencies of the rotor models.
Kaji Optimasi Desain Cetakan Injeksi Moulding pada Unit Pengolahan Limbah Plastik Dinas Kebersihan dan Pertamanan Kota Banda Aceh Ibrahim, Masri; Irwansyah, -; Safrizal, Eddi
Jurnal Teknik Mesin Unsyiah Vol 1, No 1 (2012)
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Abstract

High impact of product damage by injection molds process on polymer waste processing unit was seriously affected to quality and sustainability production. In this study effect of injection mold design was minimized by investigated and redesign injection molding system. The main equipments of injection molding system which is available at Unit Pengolahan Limbah Plastik Dinas Kebersihan dan Permanan Kota Banda Aceh are polymer waste cutting, splitting and cleaning devices and injection molding machine. According to observation conducted previously on current injection molding product and mold found that failure of product caused by mis-design of mould. Products defects occurred are sink mark, weld line and air trap. Mold-Flow software was used to modeling and simulating injection mold process. Based on simulation result and discussion found that defected products have been able minimized. By modifying sprue location and redesign mold, products defect minimized and injection pressure still remain to push polymer to mold inlet  at range 0,72-0,48 Mpa
Analisis Karakteristik Emisi Gas Buang Pada Sarana Transportasi Roda Dua Kota Banda Aceh Jalaluddin, -; Gani, Asri; Darmadi, -
Jurnal Teknik Mesin Unsyiah Vol 1, No 4 (2013)
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Abstract

The study was conducted to measure exhaust emissions and describe the level of air pollution from motorcycles operating in Banda Aceh and and surrounding areas. The measurement of exhaust emissions is done when the engine starts with the average gas pressure between 3000 - 4000 rpm and the motorcycle is in  stationary condition, as well as air conditioning in the cabin is off. The measurement parameter is Carbon Dioxide CO2 ( % ) , Carbon Monoxide CO ( mg/m3 ) , Nitrogen Dioxide NO2 ( mg/m3 ) , and Sulful Dioxide SO2 ( mg/m3 ) and the emission gauge used is Quintox flue Gas Analyzer. Based on the results of the study of the level of CO2 produced by motorcycles of various cylinder capacities are 12 % below quality standards. The level of O2 generated in the combustion process of the motorcycles is far above 2% and 1050mg/m3 of SO2. The level of SO2 exshausted is 2% above the quality standard of SO2 set in the Regulation of the Minister of  Environment , which is 800 mg/m3.
Kajian Distribusi Aliran Intake ke PLTMH Akibat Perubahan Aliran di Hulu Sungai Sufrizaliansyah, -; Maulana, Muhammad Ilham
Jurnal Teknik Mesin Unsyiah Vol 1, No 3 (2013)
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Abstract

Micro hydro Power (MHP) Rampah planned to power as many as 95 heads of house holds with an installed power capacity of 20 kW. Source water comes from rivers by building dams Rampah intake. Intake should be on the basis of a steady stream, so it does not impede the flow of water entering the intake. The writing is focused on the stability of the river going up stream along the 300 m intake, based on the difference between the two cross-sectional sediment capacity in each pias. Stream flow that occurred during measurements of 5.724 m3/sec. Debit is used to drive a 50% of the measured discharge, so the available flow is 2.862 m3/sec. This exceeds the initial survey of potential discharge stream Rampah required to drive the turbine at MHP Rampah of 1.5 m3/sec. Calculation of sediment using Frylink method. Turns on up stream erosion, so that down stream erosion, while experiencing the process of deposition of sediment down stream. Debit dominant flooding that occurred in September 2011 until February 2012 amounted to 9.833 m3/sec and a maximum flood discharge of 19.572 m3/sec. While the discharge monitoring using arc discharge regression equation Q = (3.142 H - 0.289)2. In the circumstances the magnitude of dominant flood sediments (bed load) that settles and into the intake tract of 0.00019 m3/sec, while in a state of maximum flood 0.00035 m3/sec. Minimum grain diameter (smallest) as the protector of the river at flood dominant at 21.50 mm, and maximum flood conditions used by 31.00 mm.