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All Journal Cylinder : Jurnal Ilmiah Teknik Mesin
Farel H. Napitupulu
Departemen Teknik Mesin, Fakultas Teknik, Universitas Sumatera Utara
Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Korelasi Temperatur Udara dan Intensitas Radiasi Matahari Terhadap Performansi Mesin Pendingin Siklus Adsorpsi Tenaga Matahari Tulus B. Sitorus; Farel H. Napitupulu; Himsar Ambarita
Cylinder : Jurnal Ilmiah Teknik Mesin Vol. 1 No. 1 (2014): APRIL 2014
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

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One utilization of solar energy is adsorption refrigeration cycle where its performance is influenced by the air temperature and solar radiation intensity. This research aims to determine the effect of air temperature and solar radiation intensity on the performance of the solar adsorption refrigeration. This testing uses activated carbon adsorbent of 8 kg and 2 litres methanol refrigerant. The test results showed that the value of maximum COP obtained 0.064 and the minimum COP is 0.028. The lowest water temperatures that can be reached during the process of adsorption is 8.24oC. Correlation exists between the air temperature and solar radiation intensity on the COP value is significant so as to obtain mathematical equations. Air temperature correlation with the solar radiation intensity is 0.90 and the correlation of the intensity of solar radiation with the COP obtained -0.88. While the value of the correlation coefficient of the air temperature with COP is -0.95. Also obtained the coefficient of determination is 90.45%, which indicates that the influence of air temperature and solar radiation intensity on the coefficient of performance is 90.45%.
STUDI EKSPERIMENTAL DAN PEMODELAN MATEMATIKA PROSES PENGERINGAN KAKAO ENERGI SURYA SECARA INTERMITTENT Haznam Putra; Farel H. Napitupulu; Himsar Ambarita; Siti Farah Dina
Cylinder : Jurnal Ilmiah Teknik Mesin Vol. 1 No. 1 (2014): APRIL 2014
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

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In this research, the behavior of cocoa drying using solar dryers have been studied. Experiments conducted on drying cocoa beans that have been fermented first. Cocoa plantations are taken from the area around North Sumatra - Indonesia. Solar energy is used as a source of energy that save and clean for drying. Cocoa is a mainstay in Indonesian commodities, but the quality of the current generated is relatively low. As the aims of this research is gain quality with mathematical modeling of drying by producing good quality cocoa. Preparation phase starts from cocoa fermentation process. With some testing times cocoa taken one test where the results of fermented cocoa that has been washed and dried from water content 55.83% to 7.01% (db), which lasted for 3 (three) days ie, 22 to 24 April 2013 from at 7:00 to 17:00 pm (intermittent). The study was conducted at the Solar Energy Laboratory, Faculty of Engineering Department of Mechanical Engineering of North Sumatra University Medan. It is located in Medan city with the position of 33.6 ° N - 98.4 ° W, altitude 200 meters above sea level and meridian time (GMT +7). From the experimental results obtained experimental equation mathematical model for intermittent drying of cocoa, with the value being the value of the diffusivity coefficient of 1.39 x 10^-10 to 1.85 x 10^-10 m^2/sec, besides the quality of the dried cocoa in this study better than dried cacao directly under the sun.
Co-Authors Haznam Putra Himsar Ambarita Siti Farah Dina Tulus B. Sitorus Tulus B. Sitorus