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Abstrak: Kopi merupakan suatu biji-bijian yang diolah menjadi minuman, cara mengolah biji kopi bisa dilakukan dengan berbagai cara, salah satunya dengan cara menyangrai. Tujuan dari penelitian ini adalah menganalisis kebutuhan energi pada mesin penyangrai kopi tabung silinder berputar dengan sumber panas listrik. Bahan yang digunakan dalam melakukan penelitian ini adalah biji kopi arabika. Metode penelitian yang digunakan adalah menganalisis energi pada mesin sangrai. Hasil penelitian menunjukkan bahwa analisis energi pada penggunaan energi listrik dalam proses penyangraian masing-masing sebanyak 17,568 MJ, 16,74 MJ dan 18,18 MJ pada pengujian 1,2 dan 3, energi untuk memanaskan udara sebesar 0,005 MJ pada setiap pengulangannya, energi untuk menaikkan suhu produk sebesar 0,172 MJ, 0,172 MJ dan 0,183 MJ pada pengulangan 1, 2 dan 3. Energi panas untuk penguapan dari proses penyangraian sebesar 2,180 MJ, 1,954 MJ dan 2,678 MJ pada pengulangan 1, 2 dan 3. Efisiensi tertinggi dari 3 kali pengulangan sebesar 15,764%. Analysis of Energy Requirements on Rocil Cylinder Tube Coffee Roster with Electric Heat SourceAbstract: Coffee is a grain that is processed into a drink, how to process coffee beans can be done in various ways, one of which is by roasting. The purpose of this study was to analyze the energy requirements of a rotating cylindrical tube coffee roaster with an electric heat source. The material used in this research is Arabica coffee beans. The method used in this research was experimental with energy analyze in the roasting machine. The results showed that the energy analysis on the use of electrical energy in the roasting process were 17,568 MJ, 16,74 MJ and 18,18 MJ respectively in 1, 2 and 3 tests, the energy to increase the product temperature were 0,172 MJ, 0,172 MJ and 0,183 MJ at repetitions 1, 2 and 3. The heat energy for evaporation from the roasting process were 2,180 MJ, 1,954 MJ and 2,678 MJ on repetitions 1, 2 and 3. The highest efficiency of 3 times repetition of 15,764%.

Many efforts have been carried out to boost sugarcane production through increased productivity, namely land preparation, seed repairs, fertilization, irrigation, plant maintenance and pest control. Thus, performance is very important because it will determine the quality of sugar cane. To date, sugarcane crabs is still performed manually with co-added of hoe equipment. Cutting with hoes in addition to low capacity and expensive costs, the yield is also less than expected. According to practitioners in the field, a good cutting stump requires the stump below the surface of the ground and the shaped like “U, V or W” The purpose of this study was to examine the cutting angle of the sugarcane cutting tool using 3 cutting angles of the blade that rotates vertically with two-wheeled tractor power. The highest percentage growth of shoots in each week after treatment is in the cut angler of 0° which is equal to 17.78% at 7 days after teratment to 86.67%, yet, the growth in height and diameter of shoots is the lowest treatment.

One of the factors that affect the low yield and quality of patchouli oil is the way of handling raw materials. The purpose of this study was to examine the effect of drying type and chopping size on the yield and quality of patchouli oil. The method used in this research was experimental with descriptive analysis using two factors, namely the chopping size and the drying type. The results showed that the difference in the size of the chopped and the type of drying had a significant effect on the yield of patchouli oil, while the quality had an effect and no effect. Based on the analysis of the yield and quality of patchouli oil, the best treatment obtained in this study was the condition of chopping size 7 cm followed by drying (R1P1). The yield value of patchouli oil obtained in the R1P1 treatment is the highest yield of 2.55 % with yellow oil, specific gravity 0.973 g/g, solubility in alcohol 1:1, ester number 8.48 ml/g, refractive index 1.508°, patchouli alcohol 31.31 % are in accordance with SNI standards while the optical rotation -44.50°, and the acid number of 23.9 ml/g are not according to the SNI standard.