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Pengaruh Diameter Hidrolik Terhadap Perpindahan Panas Kolektor Surya Belokan Tajam Ahmad Syuhada; Ratna Sary; Zakirullah Zakirullah
Jurnal Teknik Mesin Unsyiah Vol 7, No 2 (2019)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v7i2.18236

Rectangular crossings with sharp turns have complex three-dimensional structures because the flow separation is caused by sudden changes in direction of flow in sharp turns. This study aims to determine the effect of variations in the width of the sharp channel solar collectors with hydraulic diameter factors to increase the heat transfer rate in solar collectors. The size of the collector examined was 2440mm x 1220mm in the form of a rectangular cross-section. Solar collectors use iron and iron gram absorber with a thickness of 30mm, the thermometer is placed on each track, channel, absorbent and output temperatur of each solar collector. The results of the study can be concluded that the solar collector with the largest hydraulic diameter value of 223 cm will produce the highest output temperatur and the temperatur distribution at the collector can reach 91º C at 13.30. This is because the greater the value of the hydraulic diameter or cross-sectional area will increase the heat transfer rate.

Perencanaan Dan Pembuatan Alat Uji Pemipaan untuk Menganalisis Kehilangan Tekanan dengan Menggunakan Software Pipe Flow Expert Dinni Agustina; Ratna Sary; Martunis Martunis
Jurnal Teknik Mesin Unsyiah Vol 6, No 1 (2018)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v6i1.18223

The most dominant water distribution system used is the preparation system, in which each system has its respective advantages and disadvantages, where the weakness of the piping system is the unavoidable pressure loss caused by the connection factor and the surface roughness of the material used. Head losses are a flow loss phenomenon within the piping system. Head losses overall on 12.1 m piping system, This value can be from the sum of head losses on the pipe diameter of 25.4 mm with a length of 3400 mm of 0.0786 m. Head losses on pipe diameter 19 mm with length 3800 mm at 1.52 m and head losses at pipe diameter 12,7 mm with length 2800 mm equal to 10,59 m. The pressure in main pipe is 1,12 atm and pressure at output valve Water 1 atm based on the calculation method, the flow velocity in the main pipe 1 m/s, the speed in the second pipe 1.76 m/s, the speed in the last pipe of 3.34 m/s. Pipe used is PVC with diameter 1 inch, ¾ inch, and ½ inch. While the model pipe flow expert program 5.12 pressure on the main pipe of 1.18 atm, the pressure at the end of the valve 1 atm, the speed in the main pipe 1.077 m/s, the speed in the second pipe of 1.79 m/s, and the speed In the last pipe 3.3 m/s. The difference in velocity between modeling and calculation is due to the difference in internal diameter of the model by calculation, where the difference in value is 0.2 mm. The water debit generated from the test equipment is 1.3 m3/h, while using the software of 1.8 m3/h. The difference between the results of the experiment and modeling if the percentage of 270/0 is suppressed.

Kaji Pemanfaatan Atap Sebagai Pemanas Pada Sistem Pengering Bawang Merah (Allium Ascalonicum L.) Ahmad Syuhada; Ratna Sary; Arie Hantama Siregar
Jurnal Teknik Mesin Unsyiah Vol 8, No 1 (2020)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v8i1.18243

Allium Ascalonicum L. are one of the agricultural commodities that grow in Aceh that can bear fruits throughout the year. In 2017, the total productive land area reached 725 hectares (HA) with a total production of around 5,739 tons per year. The average of the harvested Allium Ascalonicum L has high levels of water in range of 90 – 92 %, it is necessary to do a better process of drying / storing Allium Ascalonicum L according to SNI 01-3159-1992. This study aims to determine the effect of heating with four variations of flat plate type roofs (iron, aluminum, zinc, iron coated iron sand) so as to increase the rate of heat transfer in the drying chamber. Data is collected at the absorber, heater output, pipe exit, and onion drying / storage chamber. Heaters with an iron roof type are those that best distribute the pipe output temperature of 63 0C and room temperature of 42.6 oC. The type of iron roof has a material shrinkage of 10.8%, the type of iron roof coated with iron sand has a material shrinkage of 10.5%, the type of zinc roof has a material shrinkage of 10%, the type of aluminum roof has a material shrinkage of 7.8%. The highest room humidity was achieved in the aluminum roof type by 78% and the lowest in the iron roof type was 40%.

KAJI SISTEM PEMANASAN BERTAHAP PADA PENGOLAHAN MINYAK KELAPA MURNI ratna sary; Ahmad Syuhada; Dedi Afandi
Jurnal Teknik Mesin Vol 9, No 2 (2021)
Publisher : Jurnal Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v9i2.25821

Some of the characteristics of virgin coconut oil are to produce products with lower water and acid content, clear color and have a long shelf life of 12 months. Pure coconut oil is growing rapidly not only for household needs, but is widely used for cosmetics and medicine. From an economic point of view, virgin coconut oil has a higher selling price than coconut oil which is traditionally processed by heating coconut milk or depositing coconut milk for a long time, resulting in a rancid odor and poor quality due to high water and free fatty acid content. Therefore, research on the heating process was carried out to obtain virgin coconut oil with lower water content and free fatty acids according to SNI. There are 3 methods of making virgin coconut oil, namely the method of fermentation, inducement and heating. The method used in this research is the gradual heating method, the heating method is tested with gradual heating or one heating, for gradual heating, preheating is carried out at a temperature of 60-110°C with 9 hours of drying time and final heating with a temperature variation of 60°C ( sample A), 70°C(sample B), 80°(sample C) and drying time of 5 hours, 4 hours and 3 hours. The results showed that the drying air temperature had an effect on product quality and drying time. The results of calculations and tests show that the most effective treatment is sample A with the lowest water content and free fatty acid content reaching 0.08% and 0.10%.

Kaji Sistem pengering Kakao dengan Menggunakan Energi Hybrid (Energi Matahari dan Bahan Bakar Gas) Ahmad Syuhada; Ratna Sary; Farid Isnan
Jurnal Teknik Mesin Unsyiah Vol 6, No 1 (2018)
Publisher : Jurnal Teknik Mesin Unsyiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24815/jtm.v6i1.18225

Cocoa one of the agricultural commodity which grow well that in Aceh and could producing the fruit for the rest of the year. In 2017, the wide of productive area reached 98,233 hectares (HA). The result of the crop was capable attained 32,403 tons/year. However, due to Aceh has climate tropical, when the dry season came, the drying process was still could on processing but when rainy season came, the drying process will be hampered and if the weather was still not sunny probaly it could make the fungus appeared. The aim of the research was to get the more optimal drying system so that it could be used when it was dry or rainy. The research described about drying system with 3 drying methods that is solar collector dryer, combustion dryer and hybrid dryer. From the result which conducted on 16 kg using a solar collector, the drying time was 25 hours with total energy used was 23.491,01 Kj. On the trial used hybrid energy, the drying time was 19 hours which total energy used was 160.636,19 Kj. On the trial used combustion energy, the drying time reached 14 hour with total energy used was 184.546,58 kj. in concluions that hybrid energy could get the best result in colour, kakao aromatic that more scents, no fungus, and the the seed could not break so that it reach I SNI quality.

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (17.41 KB)

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.

Analysis of Wind Energy Potential as A Hybrid Power Plant in Banda Aceh and Surrounding Areas Ratna Sary; Ahmad Syuhada; Teuku Zulfadli
Jurnal POLIMESIN Vol 20, No 1 (2022): February
Publisher : Politeknik Negeri Lhokseumawe

Wind is one of the energy sources developed as new and renewable energy in Aceh Province because of the sufficient wind potential available. In its utilization, wind speed is one of the important and main variables in calculating the amount of energy obtained. This energy will later be combined with energy sources from PLN which have been using fossil fuels. Wind potential in Banda Aceh and its surroundings is very possible to be converted into electrical energy because the average wind speed in Banda Aceh and its surroundings ranges from 4-6 m/s and can blow for approximately 4 to 6 hours per day. The results of the study of the potential of wind energy as a power plant in the Saree area (Aceh Besar District), then obtained an average wind speed in 2017 of 4.2 m/s by generating electrical power of 312 Watt/m2. In 2018 it was 4.6 m/s with an electric power of 341 Watt/m2. While in 2019 it was 5 m/s by generating an electric power of 368 Watt/m2 and the comparison in two other areas, namely Gampong Jawa and Gampong Deah Glumpang Banda Aceh, was obtained by Gampong Jawa with a wind speed of 4.35 m/s by producing 324 Watts/m2 and in Deah Glumpang Village with a wind speed of 3.95 m/s with a power output of 296 Watt/m2

Studi Eksperimental Pengaruh Konfigurasi Penampang Sekat Terhadap Kinerja Novel Cooling Tower Prototype Dedi Afandi; Ahmad Syuhada; Ratna Sary; Zulfan Zulfan; Asra Yufandi
Jurnal Mekanova : Mekanikal, Inovasi dan Teknologi Vol 8, No 2 (2022): Oktober
Publisher : universitas teuku umar

Cooling towers are widely applied in industries such as power plants and oil refineries, where the equipment produces excess heat that needs to be removed. The effect of baffles configuration on the performance of the novel cooling tower prototype was studied experimentally. The configuration of the baffles used is the baffle section without holes, the baffle section with 15 holes, the baffle section with 25 holes, and the baffle section with 35 holes. The water inlet temperature was varied, namely 55⁰C, 75⁰C, and 90⁰C. water is flowed from the main reservoir to the upper reservoir of the cooling tower using a pump, and water from the upper reservoir falls on the baffles of the cooling tower. Inlet water temperature, outlet water temperature, and water temperature at each baffle were measured using a thermocouple. The results showed that the cooling tower with a baffle of 35 holes produced the most optimal performance. The heat transfer rate produced by the cooling tower with a 35-hole baffle at an inlet temperature of 55⁰C is 624.64 Watts. At the water inlet temperature of 75⁰C, the average heat transfer rate produced by the cooling tower with a 35-hole baffle increased by 42.6%. The average heat transfer rate produced by a cooling tower with a 35-hole baffle at a water inlet temperature of 90⁰C increased by 62.6%. This is because the cooling tower with a baffle of 35 holes causes the water droplets that pass through the baffle to split into more and more so that the heat transfer rate is higher.

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