Sistem pendistribusian udara mempunyai tugas utama yaitu mengalirkan udara dingin dan bersih dalam jumlah yang tepat ke dalam ruangan yang dikondisikan. Salah satu alat dari sistem pendistribusian udara adalah difuser. Difuser yang banyak digunakan dalam sistem pengkondisian udara adalah jet swirling dan grille. Penelitian ini bertujuan untuk mengetahui pengaruh penggunaan sudut sudu difuser terhadap distribusi temperatur dan kecepatan udara dalam ruang yang dikondisikan. Metode pada penelitian ini adalah melakukan proses simulasi numerik dengan bantuan software Computational Fluid Dynamic Fluent Release 4.2 terhadap distribusi temperatur dan kecepatan udara keluar dari difuser jet swirling dan difuser grille dengan kecepatan keluar difuser diasumsikan sama. Sudut sudu pengarah dari kedua difuser ditetapkan 45o dan 60o dengan pemodelan turbulensi k-e standard. Hasil simulasi memperlihatkan bahwa untuk difuser jet swirling sudut sudu 45o, distribusi temperatur yang dihasilkan lebih rendah dan dan kecepatan udara lebih tinggi jika dibanding sudut sudu 60o. Untuk difuser grille terjadi sebaliknya dimana untuk sudut sudu 60o distribusi temperatur yang dihasilkan juga lebih lebih rendah dan kecepatan udara lebih lebih besar jika dibandingkan dengan sudut sudu 60o. Dari hasil simulasi dapat disimpulkan bahwa difuser jet swirling dengan sudut sudu 45o dapat menghasil distribusi temperatur lebih rendah dibanding dengan sudut sudu 60o. Untuk difuser grille sudut sudu 60o dapat menghasil distribusi temperatur lebih rendah dibanding dengan sudut sudu 45o
This experimental study aims to investigate and analyze the performance of a Water-Air Heat Exchanger that functions as passive cooling in a building ventilation system in the tropics. Before being blown into the room, the high-temperature outdoor air will be passively cooled by the lower-temperature water. Air driven by an Inline Duct Fan with a constant mass flow rate of 4.68 cubic meters per minute flows through a PVC hose as a heat exchanger inserted into a full water reservoir with a diameter of 100 cm and a height of 110 cm. A heat exchanger hose with a diameter of 6.35 cm and a length of 4130 cm is installed in a spiral-circular manner with a total of 16 coils with a diameter of 80 cm to increase the heat transfer effectiveness between water and air. The passive cooling effectiveness is analyzed by decreasing the air temperature between the inlet and outlet of the ventilator after passing through the heat exchanger. The temperature, humidity, and daylight measurement data were carried out for 36 consecutive hours using a multichannel data logger at several locations; ventilator inlet, ventilator outlet, water in the tub, and outside air. The measurement results show that the designed water-to-air heat exchanger provides a significant passive cooling effect and can reduce air temperature to 6.88 °C. By utilizing the passive cooling effect, the cooling energy gain obtained during the measurement period in the ventilation system of this building is 8.3 kWh. The methodology and results of this research are expected to make a positive contribution to the development of the concept of energy-efficient buildings by using passive cooling techniques
This study aims to design a cross-flow turbine in a micro hydro power plant as an alternative energy source for Indonesian remote areas that do not have electricity. The research location for the turbine design in this study is in the Ngalau Baribuik, located in Batu Gadang, Lubuk Kilangan district, Padang city. Based on the analysis of water flow characteristics, the type of turbine that is suitable for low water debit and head condition is cross flow turbine. The geometry of the cross-flow turbine is designed by considering the power electricity needs of the community and the electrical potential at the site. This experimental research was carried out in two stages; field investigations related to water flow characteristics and energy need analysis of local communities, the design and manufacture of the turbine. Based on theoretical calculation, the cross-flow turbine can produce up to 5 kW of electrical power which can meet 70% of the community's energy needs. Penelitian ini bertujuan untuk merancang sebuah turbin aliran silang pada Pembangkit Listrik Tenaga Mikro Hidro (PLTMH) sebagai alternatif sumber energi bagi daerah terisolir yang belum teraliri listrik. PLTMH dirancang untuk masyarakat kawasan Ngalau Baribuik yang berlokasi di Batu Gadang Lubuk Kilangan kota Padang. Berdasarkan analisis karakteristik aliran, untuk kondisi debit dan tinggi jatuh air yang kecil turbin yang paling sesuai digunakan adalah aliran silang. Disain dan geometri turbin disesuaikan dengan kebutuhan masyarakat dan potensi yang ada di lokasi. Penelitian eksperimen ini dilaksanakan dalam dua tahap; (a) investigasi lapangan terkait dengan karakteristik aliran air dan kebutuhan energi masyarakat, dan (b) proses perancangan dan pembuatan turbin. Secara teoritis, turbin aliran silang yang dirancang akan dapat memproduksi daya listrik hingga 5 kW yang akan memasok 25% kebutuhan energi masyarakat setempat.
Refrigerator has a significant role as a tool for food storage. Stored foods in refrigerator can be maintain the food quality and delay the stale. Currently, the refrigerator not only used at home but also in offices or shops that sell foods. It could imagine if without refrigerator, the foods will fast stale and lost their quality. This Research aim to know the performance parameters of refrigerator among others consumption total refrigerator power compared to with the resulting performance or Energy Efficiency Ratio (EER), and characteristics decline temperature in cabin at range time certain with two of brands refrigerator on the market. Research about of the refrigerator performances follows ISO-7371-1985 standards, European Standard EN 153, British Standards Institution 1990. Results obtained to refrigerator tested that average input power for refrigerator A is 83.3 Watts and input power inside condition stable of 66 Watts, EER 1.84 and the minimum temperature can be achieved in cabin refrigerator in time for 5 hours; -11.8 ℃ in the above of cabin, -6.2 ℃ in the center of cabin and 5.1 ℃ in the bottom of cabin, temperature product is -14.4 ℃. For refrigerator B average input power is 85.8 Watts and input power inside condition stable is 74 Watts, EER 1.64 and the minimum temperature can be achieved in cabin refrigerator; -5.5 ℃ in the above of cabin, 0.9 ℃ in the middle of cabin and 1.7 ℃, temperature product is -9.8 ℃.
Cubadak Air and Sikapak Barat villages are two villages from many villages affected by the earthquake that hit West Sumatra in 2009. The impact is still felt today. More than eighty percent of the houses and economic facilities of the people in this area were destroyed, so there was a lot of unemployment in this village. The purpose of this activity was to train groups of out of school youth in Cubadak Air and Sikapak Barat villages about welding techniques and the manufacture of neon box advertising boards. The method used in this activity is the provision of theories about the science of materials, welding, workshop management, welding practice techniques, and the manufacture of billboards. The results of this activity were the completion of the signboard of the Al-Abrar Great Mosque and the "Piaman Saiyo" Community Training Center in Cubadak Air Village.Key words: Workmanship, Billboards, Neon boxes, Skills Abstrak. Desa Cubadak Air dan Sikapak Barat adalah dua desa dari banyak desa yang terkena bencana gempa yang melanda Sumatera Barat pada tahun 2009 lalu. Dampaknya hingga kini masih terasa. Lebih delapan puluh persen rumah dan fasilitas perekonomian masyarakat di daerah ini hancur, sehingga di desa ini banyak terjadi pengangguran. Tujuan dari kegiatan ini untuk melatih kelompok pemuda putus sekolah di Desa Cubadak Air dan Sikapak Barat tentang teknik pengelasan dan pembuatan papan iklan dari neon box. Metode yang dilakukan dalam kegiatan ini adalah pemberian teori tentang ilmu bahan, las, manjemen bengkel, teknik praktek las, dan pembuatan papan iklan. Hasil yang dicapai dari kegiatan ini adalah telah selesainya papan nama Masjid Raya Al-Abrar dan Pusat Pelatihan Masyarakat “Piaman Saiyo” di Desa Cubadak Air.Keywords: Tuna karya, Papan iklan, Neon box, Skill
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