Solar desalination functions to filter water, both sea water and brackish water, to produce clean water that is fit for consumption with energy from the sun. Solar energy is a renewable energy source that has been widely studied for its use. One of its uses is in a double slope passive solar still where the sun is the main source. Energy and exergy obtained from solar energy are not all used to evaporate water in the desalination system, so it is necessary to calculate efficiency energy and exergy in the system. This study aims to obtain data on the amount of efficiency energy and exergy from the double slope passive solar still as well as the factors that affect efficiency energy and exergy. The results showed that energy efficiency was in the range of 30.20% to 55.15% and exergy efficiency was in the range of 0.93% to 5.36%. The factors that influence the amount of energy efficiency and exergy are solar intensity, basin area, basin cover area, amount of water produced and ambient temperature.
Biaya yang digunakan untuk membeli bahan bakar minyak bumi semakin meningkat, hal ini belum termasuk dengan biaya lain yang dikeluarkan. Meningkatnya biaya penggunaan bahan bakar fosil dan persediaannya yang semakin terbatas menyebabkan banyak penelitian sains, teknik, dan teknologi untuk mencari sumber bahan bakar alternatif lainnya. Salah satu alternatif yang telah ditemukan adalah penggunaan bioetanol sebagai bahan bakar alternatif. Bioetanol merupakan bahan bakar yang ramah lingkungan karena terbuat dari bahan bakar nabati serta memiliki angka oktan yang lebih tinggi dibandingkan dengan bahan bakar fosil seperti premium. Salah satu tanaman yang dapat digunakan untuk menghasilkan bioetanol dari proses fermentasi dan destilasi adalah tanaman tebu. Tujuan dari penelitian ini adalah mendapatkan pengganti bahan bakar yang berasal dari bahan bakar alternatif yang dapat membantu mengurangi krisis dari bahan bakar minyak bumi, mengetahui proses pengolahan tebu menjadi bioetanol, dan mengetahui besarnya nilai oktan atau RON (Research Octane Number) pada bioetanol. Pada penelitian ini dilakukan empat kali percobaan dengan menguji komposisi masing-masing komponen pengujian dan nilai oktan yang didapatkan tiap masing-masing pengujian adalah 114, 115, 116, dan 117.
The purpose of this PkM is to provide welding competency skills to SMK Samudera Indonesia Medan students as a provision to enter the job field or for entrepreneurship for SMK and help the productive process of SMKs that lack funding and practicum facilities. The method used to solve the problems that have been formulated, we need a method that must be followed in order to be able to do a good solution, here is the solution method, namely a survey in SMK to get data for PkM as needed, formulate training materials, make a schedule for the implementation of training related to time, arrange instructors who will provide training, make a design evaluation of activities, The implementation of welding training activities was followed by students. The results of the PkM implementation are as follows: Welding skills that can equip vocational students to enter the world of work are being able to operate a welding machine correctly and be able to connect plates using welding. The responses from vocational students with training assistance from the UHKBPNP Mechanical Engineering Study Program are as follows: they are happy because they have received welding skills which they have not done optimally and the teachers hope that next year they can continue with other programs.
Salah satu masalah yang sedang dihadapi di beberapa daerah di Indonesia adalah air. Air merupakan sumber kehidupan yang digunakan untuk berbagai keperluan. Salah satu sumber air yang sering digunakan oleh masyarakat adalah sungai. Sungai merupakan salah satu habitat hidup air bagi sebagian makhluk hidup air tawar. Salah satu unsur kualitas air adalah tingkat kecerahannya. Air dengan tingkat kecerahan yang tinggi sangat memungkinkan terjadinya proses asimilasi dalam perairan. Tingkat kecerahan air sangat mempengaruhi proses fotosintesis fitoplankton. Tujuan dari kegiatan pengabdian kepada masyarakat ini adalah untuk membantu masyarakat Kelurahan BP. Nauli Kecamatan Siantar Marihat Kota Pematangsiantar dalam mengetahui tingkat kecerahan air sungai Bah Toge sehingga air sungai dapat dipergunakan untuk berbagai kegiatan yang menguntungkan seperti tambak ikan. Metode pelaksanaan kegiatan adalah memberikan pelatihan dalam pembuatan Secci disk serta penggunaannya. Dari hasil pengujian terhadap kecerahan air sungai Bah Toge diketahui bahwa tingkat kecerahan air pada sungai Bah Toge masih sangat keruh dengan tingkat kecerahan di bawah 50% dari kedalam air.
Solar distillation is a method of thermal desalination in which water is evaporated using solar energy and the separated water vapor is condensed again as pure water. This is a good practical alternative in offering a renewable energy source that is used to produce clean water in areas where there is a lack of clean water. This study aims to obtain the results of the amount of thermal energy obtained from a passive solar desalination system with a double slope and the factors that greatly affect the amount of thermal energy in the system. In this study, the method used for data collection was an experiment carried out for eight days. From the research results, the highest thermal energy produced is 9.18 kWh and the lowest is 1.23 kWh, and the factors that affect the amount of thermal energy are the heat transfer coefficient and the amount of distilled water produced by the system. By knowing the amount of thermal energy produced by the system, areas that have a lack of clean water can use a passive solar desalination system with a double slope that uses solar energy as its energy source.
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