S. Sudha

For saline or wastewater, solar distillation is a suitable, environmentally friendly technique for purifying water. The problem is that there is no distillation process that produces salt water, and that salt water used on plants may cause plant death. The techniques described in this work aim to enhance the solar distillation process using solar stills with a steam generator and a condenser. The distilled water was heated between 11 am and 4 pm, with best output of 1200 ml at 80-90°C. One method used to achieve faster evaporation is to increase the heating rate so that the temperature changes rapidly, such as 100°C/min, which results in lower total yields due to overheating. The novelty of this work is that the heating rate to the steam generator is increased, thereby increasing the overall temperature and the surface water temperatures of the solar still and the water surface. The other advantage of the extended heating for three hours was that it also resulted in higher yields, and sunlight alone did not guarantee that high temperatures were equivalent to moisture-loss temperatures above 41°C.Various thermal enhancement techniques were used in the study, including sensible heat storage synthesis, warming in an aquatic basin, and altering surface absorptivity. Furthermore, external thermal support to increase heat supply and improve thermal conduction pathways to the basin was designed to keep high temperatures throughout the low-light availability period. This study examined the effect on system efficiency and the performance comparison of different approaches to increase the efficiency of the solar dehydration process under realistic operating conditions. This study provides a scalable, energy- efficient, and renewable-energy solution to locally produce freshwater for the benefit of global health and climate goals.

This experimental study aims to determine the resonant frequency in planetary and high-frequency gearboxes operating in offshore environments at 1150 rpm (corresponding to 740 Hz). This research aims to investigate resonance throughout the gearbox using an FFT test bench and Ansys software. The analysis methods include examining the entire gearbox and housing in ANSYS Workbench. Key findings from three load cases are as follows: in load case three, the gearbox housing exhibited resonance at the fourth mode, accompanied by significant noise, including whistling, reaching up to 100 decibels. To address this issue, a stiffener should be added to the gearbox housing to mitigate resonance. The practical value of this research lies in identifying the gearbox’s resonance modes to prevent excessive vibrations that can lead to premature component wear. Recognizing resonance is essential for developing transmission systems that can withstand the potential for failure and extend their operating lifespan. By detecting and addressing these resonances, we can reduce disturbances, protect the gearbox, and allow seabirds and other wildlife to thrive.