Current Issue : July-September Volume : 2026 Issue Number : 3 Articles : 5 Articles
The Indonesian government should seriously consider the use of renewable energy, given the natural potential that can still be utilized as an environmentally friendly power source. The utilization of renewable energy can be achieved by harnessing available natural resources. Pico hydro power plants (PLTPHs) can serve as an alternative electricity generator for use in Indonesia due to the existing natural potential. The output from this power plant can be utilized directly or stored in batteries. Directly measuring the generator’s performance on-site is deemed less effective. Therefore, a monitoring system is introduced as a solution to allow remote monitoring and display parameters such as voltage, current, frequency, and power of the generator online. This system is designed to display the micro hydro generator’s output parameter data on the Blynk application. The display on the Blynk application can be monitored via a connected mobile phone. Testing of the monitoring system was carried out by comparing two sets of measurements: one through the PZEM-004T sensor system and the other through a kWh meter (Kilowatt-hour meter). For the AC output from the battery with a 12-watt lamp load (tested 4 times), the reading error values obtained were a voltage reading error of 0.2%, a current reading error of 19.4%, a frequency reading error of 0.67%, and a power reading error of 18.2%....
Advancements in concentrating solar power (CSP) plants are essential for the wider adoption of these technologies. Increasing the operating temperature of the plants is one of the most promising ways to achieve further cost reductions and performance improvements. In this context, progress in supporting components—such as molten salt tanks—is critical to enable these advancements. This study compares a novel molten salt tank based on a refractory concrete formulation with a conventional design made from 347H stainless steel over the period 2015–2025. The prices of refractory concrete and stainless steel were analyzed across the decade to estimate the costs of the corresponding TES tanks in 2015 and 2025. The results showed that, while the concrete-based tank was more expensive than the conventional tank in 2015, the situation reversed by 2025, with the conventional stainless steel solution becoming 11% more expensive than the refractory concrete alternative. Additionally, an analysis of the producer price indexes for both materials highlighted that concrete exhibited a more stable price trend compared to stainless steel, which was subject to greater intra- and inter-year fluctuations. Finally, a brief examination of the 347H stainless steel production chain identified key causes of price volatility, such as the high geographic concentration of its main raw material extraction sites worldwide....
This study aims to explore how digital transformation (DT) accelerates the achievement of net zero (NZ) goals within Taiwan’s green energy industry. By employing quality function deployment as the analytical framework and multiple-attribute decision making for systematic evaluation, a practical and integrative model is developed to identify key DT technologies. The results reveal that establishing a comprehensive carbon footprint management system is the most essential NZ strategy, while Radio-Frequency Identification emerges as the most influential DT enabler supporting sustainability, emission reduction, and industrial transformation toward a smart and low-carbon economy....
Axial flow pumps, widely utilized in critical fields such as agricultural irrigation, urban water diversion and flood control, play an indispensable role in large-scale water transport and drainage projects due to their high-flow and low-head characteristics. This study systematically investigates the influence of tip clearance on the external characteristics and internal flow field of a large-scale axial flow pump (model 1800GZX-125). By combining numerical simulations with experimental validation, a comparative analysis was conducted under four tip clearance sizes (3 mm, 12 mm, 17.5 mm, 24 mm) and various flow conditions. The results indicate that increasing the tip clearance generally reduces the pump head and peak efficiency. It also alters the blade pressure distribution, expands the low-pressure region, and intensifies tip leakage flow. While vorticity overall increases, it weakens locally under certain conditions due to changes in leakage flow patterns. Entropy generation analysis further reveals that larger clearances lead to significantly increased energy losses, thereby degrading external performance. These findings provide a theoretical basis for improving the performance and operational stability of axial flow pumps....
This study focuses on hydrogen production through water electrolysis using an ash solution. Hydrogen is increasingly being used as a replacement for fossil fuels in various applications, including transportation and industry. The study involves using an ash solution as an electrolyte instead of potassium hydroxide. Electrolyte solutions were prepared using 100g of ash per 1L of water. For the experiment, 0.2 L, 0.5 L, 1 L, and 2 L of this prepared solution were respectively taken and diluted with water to obtain 3 L of electrolyte for hydrogen production. During the tests, production parameters such as temperature, current intensity, voltage, and hydrogen production time were measured because of their influence on the quantity and continuity of hydrogen production through water electrolysis. The results reveal that, for a volume of 0.2 L of ash solution, hydrogen production was 0.058 L/min, the voltage was 13.41 V, the current was 26 A, and the temperature varied from 30˚C to 35˚C over a period of 4 minutes and 10 seconds. For a volume of 0.5 L of ash solution, hydrogen production was 0.494 L/min, the voltage was 13.30 V, the current was 36.6 A, and the temperature varied from 30 to 34˚C over a period of 1 minute and 31 seconds. For a volume of 1 L of ash solution, hydrogen production was 0.5 L/min. Parameters such as temperature varied from 30 to 36˚C, with an electrical voltage of 12.5 V and a current of 68 A over a period of 1 minute and 35 seconds. A 2 L volume of ash solution provides rapid and abundant hydrogen production. Production parameters such as temperature vary from 30 to 40°C with an electrical voltage of 11.07 V and a current of 90 A for a duration of 1 minute 15 seconds. In conclusion, a 0.5 L volume of ash solution in the tank allows for stable operation of the hydrogen generator with minimal variation in production parameters....
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