R. Napitupulu, Alberto Hutauruk, Miduk Tampubolon, L. Siagian, Parulian Siagian
{"title":"Perhitungan Energi Bagi Kebutuhan Pengepresan Kopra Pada Perancangan Mesin Press Minyak Kelapa","authors":"R. Napitupulu, Alberto Hutauruk, Miduk Tampubolon, L. Siagian, Parulian Siagian","doi":"10.36655/SPROKET.V1I1.33","DOIUrl":"https://doi.org/10.36655/SPROKET.V1I1.33","url":null,"abstract":"An experiment has been conducted to determine the amount of deformation energy and energy per volume needed for the design of coconut oil press machines. By using a press tube with a diameter of 59 mm and by varying the load of press and speed of press the results obtained that to produce the optimal average volume of coconut oil are at the pressure load of 40 KN and the pressure rate of 6 mm / minute. The ideal energy per volume used to suppress coconut oil press machine is 6.106 J / m3.","PeriodicalId":156199,"journal":{"name":"SPROCKET JOURNAL OF MECHANICAL ENGINEERING","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127911916","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Parulian Siagian, Tumiur Gultom, Sibuk Ginting, Hotman Manurung, E. Setyawan
{"title":"Pengaruh Perbedaan Ketebalan Irisan Asam Gelugur (Garcinia atroviridis) Terhadap Kandungan Total Asam Pada Asam Sitrat Dengan Pengeringan Sinar Matahari Sistim Konveksi Paksa","authors":"Parulian Siagian, Tumiur Gultom, Sibuk Ginting, Hotman Manurung, E. Setyawan","doi":"10.36655/SPROKET.V1I1.38","DOIUrl":"https://doi.org/10.36655/SPROKET.V1I1.38","url":null,"abstract":"The mechanism of the drying process is the process of heat transfer and mass transfer that takes place simultaneously. The pressure of the water vapor in the acid gelugur is higher than that on the surface interface of the gums and air acids. Intensity solar radiation averages around 300-590w / m2 and Ambient Temperature 28,830C. The hot air condition in the drying box averages 320C. The content of total citric acid gelugur acid was 1.2787% with 3mm slice thickness and 1.3981% with a 5mm slice thickness. Drying is done from 08.00-17.00 am with a hot air flow rate of 1.5m/s. \u0000","PeriodicalId":156199,"journal":{"name":"SPROCKET JOURNAL OF MECHANICAL ENGINEERING","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130527816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Napitupulu, Suriady Sihombing, C. Manurung, Jonner Togatorop
{"title":"Pengaruh Waktu Tahan Dan Penambahan Kadar Garam Dapur (NaCl) Dalam Media Pendingin Air Pada Proses Hardening Terhadap Sifat Mekanik Dan Struktur Mikro Baja Karbon Rendah","authors":"R. Napitupulu, Suriady Sihombing, C. Manurung, Jonner Togatorop","doi":"10.36655/SPROKET.V1I1.36","DOIUrl":"https://doi.org/10.36655/SPROKET.V1I1.36","url":null,"abstract":"This study aims to determine the effect of salt (NaCl) in water cooling media with different levels of 10%, 16% and 25% against the hardness level of low carbon steel tested with Vickers after hardening in the hardening process and to determine the proportion of media which coolant produces the highest hardness from the use of water cooling media which is added to different levels of NaCl. \u0000The independent variable in this study is the amount of salt (NaCl) dissolved in water cooling media with different percentages, namely 10%, 16% and 25%. While the dependent variable is the value of the hardness of the material tested with Vickers. Hardness in the hardening process with water cooling media which added different salt (NaCl), 10%, 16% and 25% is 185.02 VHN, 229 VHN and 284 VHN. From the results of the study it was found that there was an effect of the salt content (NaCl) in the water cooling media on the level of hardness in the hardening process of low carbon steel. Higher level of salt will increase value of hardness. The highest hardness was achieved in cooling media with a concentration of 25% NaCl that is equal to 284 VHN followed by cooling media with a concentration of 16% NaCl of 229 VHN and the lowest was a cooling medium with a concentration of 10% NaCl of 185.02 VHN.","PeriodicalId":156199,"journal":{"name":"SPROCKET JOURNAL OF MECHANICAL ENGINEERING","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131568155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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