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Tulus Burhanuddin Sitorus
Mechanical Engineering Universitas Sumatera Utara
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Education Energy Engineering Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation

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Journal : Rekayasa Mesin

 1 
Performansi Alat Penukar Kalor Udara-Tanah (Earth-Air Heat Exchanger) dengan Siklus Terbuka di Kota Medan Manik, Terang U.H.S. Ginting; Sitorus, Tulus Burhanuddin
Rekayasa Mesin Vol 10, No 2 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.02.6

Abstract

The purpose of this study was to obtain the performance of an EAHE (earth air heat exchanger) with weather conditions in the Medan city. The research method carried out was experimental in the field for several days with varying weather conditions. The air conditioning system using an Air-Earth Heat exchanger has tested its performance by comparing the experimental results with the model of equations that have been developed by the previous researchers. The incoming air velocity 2 m/s is obtained by the output temperature on average for the results experiment with 27.1oC and for theoretical results of 26.5oC with an average air temperature of 32.1oC. As for the incoming air velocity 3 m/s, the resulting output temperature averages for the experimental results of 27.3oC and for theoretical results of 26.9 oC with an average air temperature that is 33.8oC. The higher the air intake velocity, the higher the output temperature in the Air-Earth heat exchanger. At 2 m/s air velocity, the output temperature is 27.1oC and then rises to 27.3oC at air velocity enter 3 m/s. The effectiveness of the earth heat exchanger at the incoming air velocity 2 m/s for the experimental results was 0.84 while the theoretical calculation was 0.97. From the results of multiple regression analysis, it is found that the NTU and inlet air temperature values have a very strong relationship to the COP value. The correlation coefficient is 0.916 at a speed of 2 m/s and 0.959 at a speed of 3 m/s. The results show great potential for the development of ground-air heat exchangers as a passive cooling system building solution.
Kajian Eksperimental Mesin Pendingin Adsorpsi Tenaga Surya dengan Menggunakan Adsorben Campuran Sitorus, Tulus Burhanuddin
Jurnal Rekayasa Mesin Vol 10, No 1 (2019)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2019.010.01.7

Abstract

The purpose of this study was to obtain the performance of the adsorption refrigerator driven by solar energy using mixed adsorbents. The refrigerant used is methanol with 99% purity. The adsorbent used is a mixture of active carbon-active alumina with mass of 7 kg. The type of active alumina used is molecular sieve 13X and the activated carbon used is the ordinary type of coconut shell with 1-3 mm grain size and is produced in the province of North Sumatra. Note that active alumina and activated carbon tested can absorb methanol in the range of 350 ml/kg and 300 ml/kg with a heat source of about 120oC. The test was carried out in the open field exposed to solar radiation from 08.00 WIB until 08.00 WIB the next day for seven cycles. The average of solar radiation ranges from 107.036-214.44 W/m2, and the duration of radiation varies from 12.03 to 12.28 hours/day during experiments. The test results also show that the use of mixed adsorbents with methanol adsorbate can produce evaporation temperatures up to about 4,16-13,90°C with a heat source from a temperature of 91.32-97.35°C. The efficiency of collector obtained during testing ranges from 60.09 to 62.26% with maximum solar radiation conditions ranging from 799.40 to 882.76 W/m2. The COP value obtained in the range 0.0770-0.1003 with the total daily radiation between 11.245-17.156 MJ/m2.
Co-Authors Ahmad Y Nasution Alfian Hamsi Andi Syahputra Arief Hariyanto Daniel F.B Sinaturi David Chandra Derrick Tanadi Elisabeth Ginting Farida Ariani Farida Ariani Ferry Sembiring Ginting, Elizabeth Jaya Arjuna Jonathan A.R Siagian Lestina Siagian Manik, Terang U.H.S. Ginting Manik, Terang UHS Ginting Manik, Terang UHSG Mulfi Hazwi Rachmat Kentardjo Ridha Irfandi Ryan Alexander Sembiring, Ferry Sembiring, Ferry Situmorang, Mangontang Suprihatin - Syahrul Abda Syahrul Abda Syaifuddin Lubis Tekad Sitepu Tekad Sitepu Terang U. H. S. G. Manik Wiranto Arismunandar Yosua F.S.R Zebua Zulkifli Lubis Zulkifli Lubis