IRA Journal of Engineering Science and Technology

Analysis of Wind Energy Potential as a Vertical Axis Wind Turbine Drive (VAWT)

2024-08-28T18:25:21+07:00

The use of wind energy in rural areas of Indonesia is still limited. This study assesses the potential of wind energy in Sigara Gara Village as a driver of vertical-axis wind turbines. The data used was in the form of secondary wind speed data in 2021 from the Graha Garuda Mas housing complex weather monitoring station at an altitude of ±13 m. Data per second is averaged daily, then compiled into monthly and annual averages. The results show a yearly average of 0.70 m/s with a monthly range of 0.70–0.80 m/s. The value is below the initial operating speed range prevalent for small wind turbines. The power per unit area calculated from this average is very low, making it unfeasible for a VAWT drive. The study suggests higher micro-mapping, or diverting to other sources of NRE that are more suitable to local conditions.

Utilization of Archimedes' Water Turbine for Mobile Phone Charging in Rice Fields

2024-08-26T17:03:05+07:00

This study evaluated the performance of small-scale screw Archimedes turbines for mobile phone charging in low-head rice fields. Field tests were carried out at ±0.60 m head with an average discharge of 0.0369831 m³/s. The parameters measured include discharge, torque, revolution, turbine power, generator output power, and battery charge profile. Hydraulic power was recorded at 216.808 W, turbine power was 17.9785 W at 931 rpm, and peak generator power was 27.84 W. The system charged the battery from 0% to 100% in 180 minutes with a constant current phase at the beginning and a near-full current drop. The overall efficiency of hydraulic power reaches 12.85%. The results demonstrate the feasibility of utilizing off-grid microhydro systems on agricultural land. Recommendations include optimization of blade geometry, tilt angle, transmission, and use of DC-DC CC–CV converters. Improved instrumentation and retest on discharge and head variations are recommended.

Development of a Mathematical Model to Predict Wind Energy Potential and Vertical Axis Wind Turbine Efficiency

2024-08-27T09:32:53+07:00

The world's energy supply remains highly dependent on fossil fuels, such as petroleum, coal, and natural gas, which are non-renewable. Due to their limited availability, the development of alternative energy sources is crucial. Renewable energy options include biomass, solar energy, wind energy, and small-scale hydropower. Among these, wind energy is considered relatively clean, environmentally friendly, and free from carbon dioxide emissions. The design of wind turbines must be adapted to local wind profiles to achieve optimal efficiency. This study focuses on the performance of vertical axis wind turbines (VAWTs) using linear regression analysis to examine the relationship between wind speed and corrected power output. The results indicate a significant effect of wind speed on turbine performance, showing that potential wind power in an area is a key factor in determining the energy output of VAWTs. These findings highlight the importance of designing turbines effectively and selecting suitable sites to optimize renewable energy utilization.

The Effect of Temperature on Sealer Adhesion in the Packaging Process using the KM-2500 Machine

2025-07-04T09:38:16+07:00

This study evaluates the effect of temperature on the adhesion of packaging in the KM-2500 sealer machine. Leaks, imprecise seals, and rework often disrupt the packaging process. This research focuses on temperature tests of two subsystems: roller sealers and end sealers. The operating speed is set at 150 rpm, the vacuum pressure is 0.6 bar, and the stabilization time is 15 minutes. The packaging material is an aluminum foil laminate with an LDPE seal layer. Temperature measurements are carried out using thermocouples. The quality of the adhesive is assessed through visual inspection and a simple leak test. Five sets of temperature points were tested on each subsystem. The results showed that the temperature was too low, resulting in weak adhesion and leakage. Too high a temperature creates thermal distortion in the film. Optimum conditions were obtained on a 259 °C Roller Sealer and a 134 °C End Sealer with a 100% success rate on two replications. These findings confirm that temperature is the primary controlling parameter for seal quality. Operating recommendations include 15-minute pre-heating, in-line temperature verification, and periodic monitoring of seal quality. These results can serve as a reference for establishing standard settings on production lines to minimize scrap and rework.

Testing of a Thermoelectric Generator (TEG) Using Heat from a Satay Furnace

2025-08-18T20:20:49+07:00

This study tested TEGs that utilize the heat of the satay furnace. The purpose of the research is to map heat transfer to the TEG module. The next goal is to measure the voltage, current, and electrical power generated. The test was conducted experimentally at six combustion time intervals. The parameters measured include hot side and cold side temperature, ∆T, voltage, and current. The estimated heat transfer was calculated using a simple radiation and conduction model. The results show a maximum power of 0.65 W at TEG-3 at 3,600 s. This condition is achieved at ∆T ≈ 46.7 °C with a voltage of 2.18 V and a current of 0.30 A. The lowest power of 0.53 W is recorded at TEG-2 at 3,600 s. The increase in ∆T is directly proportional to the rise in power in the test range. These results confirm the potential of satay kiln waste heat as a source of micropower.