The indoor thermal comfort is one of the key factors in designing an energy-efficient sustainable building. In the tropics, ensuring indoor thermal comfort using air conditioning systems is the primary cause of the high energy consumption of buildings. This thermal comfort is greatly affected by the characteristics of the building envelope material, including the roof. Zinc roofing sheet is the most common roofing material used in Indonesia because of its lightweight and easy installation. However, it is corrosive, and it has a high thermal conductivity that can lead to overheating in the room. In order to improve indoor thermal comfort, it is necessary to find alternative, environmentally friendly building roofing materials. The purpose of this experimental study is to analyze and evaluate the effect of the type of roofing material on rooms' temperature profile and indoor thermal comfort level. Temperature measurements are carried out for three consecutive days on three prototype buildings with the one-twenty scale with different roofing materials: zinc plate, bamboo, and sugar palm fiber called Ijuk. In each building, four temperature sensors connected to a temperature data logger are placed at the rooftop surface, attic zone, bedroom, and living room. The measurement results show that the type of roofing material has a significant impact on the indoor temperature profile and comfort level both day and night. Considering the thermal performance shown by the results of the study, Ijuk can be a rational choice as a roofing material for residential houses in tropical climates.
Gasoline engines with electronic fuel injection systems are recommended to use Pertalite type unleaded gasoline to produce a perfect combustion process so as to improve engine performance. However, the majority of vehicle owners prefer to use Premium type fuel and sometimes also mix it with other fuels, resulting in decreased engine performance. This is due to the low price of Premium and consumers do not understand the effect on engine performance. This research was conducted on a Toyota Avanza K3-VE 1,298 cc with an experimental method that aims to determine the performance of a gasoline engine with an electronic fuel injection system using several types of fuel. To find out the optimal engine performance, the test is carried out at maximum engine speed using a dynamometer bench. The results showed that the right fuel used in gasoline engines with electronic fuel injection systems is Pertamax type because it has optimal engine performance, which produces an maximum torque of 176.23 Nm and an maximum power of 105.83 Kw.
Energi menjadi sumber penggerak awal dibidang otomotif. Dimana didunia otomotif ada energi yang dapat diperbarui seperti gas hidrogen. Gas hidrogen merupakan bahan bakar berbentuk gas yang memiliki karakteristik tidak berwarna, tidak berasa, dan tidak berbau. Gas hidrogen bisa diproduksi dengan cara elektrolisis air (H2O). Dimana larutan elektrolit akan direaksi menggunakan arus listrik sehingga menghasilkan gas hidrogen (H2) dan gas oksigen (O). Penelitian ini menggunakan metode penelitian eksperimental untuk mengetahui pengaruh variasi jumlah plat elektroda pada elektrolizer terhadap volume dan laju produksi gas HHO dengan menggunakan gelas ukur. Hasil penelitian menunjukkan bahwa pengaruh variasi jumlah plat elektroda pada elektrolizer terhadap volume gas HHO tertinggi terjadi pada variasi 14 plat elektroda dengan kenaikan sebesar 33% . Sedangkan untuk laju produksi gas tertinggi terjadi pada variasi 14 plat elektroda dengan kenaikan sebesar 36%.
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