Access to electricity in Indonesia is limited due to the remote area of the community. In the modern era, electricity is a primary necessity and indicator of welfare. To overcome this problem, using ...renewable energy resources in the remote areas of Indonesia is an appropriate alternative. Based on this condition, the pico hydro-type undershot waterwheel is suitable to be used in Indonesia, because undershot waterwheels are appropriate for low head conditions or low river flow. This study will examine the effect of different blade numbers on the performance of undershot waterwheels for straight blades. There are four blade number variations: 8, 12, 16, and 20. The computational fluid dynamic method was used because it can visualise the flow pattern with more detail than other methods. Activating six degrees of freedom is needed to predict the rotational speed of the turbine's interaction with the water and blade. Based on the results, 20 blades produced higher efficiency than others. However, the 8 blades had a stable performance and produced higher rotational speed than the other. The empirical equation for determining the number of blades of undershot waterwheels adopted by the Pelton turbine is correct.
In the 26th Conference of the Parties (COP26), United Nations Framework Convention is committed to suppressing the acceleration of climate change due to carbon by applying energy from fossil fuels to ...New Renewable Energy (NRE). Indonesia targets that in 2060 the coal phase-out will be replaced by renewable energy 2056. As a tropical country with many rivers and many lakes, Indonesia has a water energy potential of 75,000 MW. In some remote areas, the need for electrical power is pico scaled (< 5kW). The vortex turbine was chosen to be suitable for river flow with low water levels, low maintenance and construction costs, as well as being environmentally friendly for the underwater ecosystem. This study aims to compare the performance of the vortex to the differences in the shape of the pico scale blade. This study was carried out with variations in the shape of the straight, tilted, and curved blades. Based on the results of all vortex turbine studies, it can be ascertained that the best blade shape obtained numerically is an inclined blade with a hydraulic efficiency of 36%.
It is necessary to utilize desalination technology to clear the water available, including seawater, to meet the increasing need for clean water due to population growth. Several desalination ...methods, such as thermal methods, membranes, freezing g, and ion exchange, continue to be developed but have not overcome some deficiencies. Therefore, new alternative desalination methods with droplet atomization, which utilizes the air entrainment phenomena, are being developed. Research on non-dimensional fluid atomization is the basis for designing this method. The study used brine pumped through a nozzle with a small diameter to become mist or vapor. This study carried out variations of research parameters on the configuration of the experimental apparatus in the form of pressure, the diameter of the nozzle, and the number of nozzles. Quantitative data from experimental results obtained from measurement instruments and qualitative data in videos obtained using a camera are to be processed into quantitative data using image processing. The results showed that pressure affects the characteristics of a full cone-shaped water spray. It was found that the best spray system configuration with two nozzles with a diameter of 0.5 mm in a pressure of 9 bar.
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