Dandun Mahesa Prabowoputra, Aditya Rio Prabowo, Syamsul Hadi and Jung Min Sohn
In Southeast Asia, the renewable energy produced from hydropower systems has significant potential. Therefore, adequate development is needed to prevent future energy-related…
Abstract
Purpose
In Southeast Asia, the renewable energy produced from hydropower systems has significant potential. Therefore, adequate development is needed to prevent future energy-related crises. This study, therefore, aims to determine the variations effects in geometry and the geometrical factors on turbine performance.
Design/methodology/approach
The developed aspects are selected to determine the blade shape, its number and multistage requirements. The study was conducted in 3D simulation, with Ansys software used to calculate a series of computational fluid dynamic problems. The aspect ratio applied in this study utilized the ratio of the overall diameter of the rotor height (D / H), which is 1.
Findings
The results showed that the highest Cp-max value, number of blades and stages were 0.2, two and three, respectively. Furthermore, these attributes combined to improve the performance of hydroturbines.
Research limitations/implications
The research was fully conducted using numerical simulation, which requires sustainable research in the form of laboratory experiments. Also, pioneer experiments were conducted using benchmarking to ensure the results obtained are reliable.
Practical implications
Hydropower is one of the best renewable energy sources in Indonesia with a large potential in the archipelago and tropical countries due to rivers and various water sources. The current generated is a useful reference for Savonius design.
Originality/value
The originality of this study is to examine the three aspects of the geometry of the rotor, such as the number and shape of blades, as well as the stages in the same boundary conditions. Therefore, the comparison of the effects of changes in geometry on turbine performance is more acceptable and complete compared to the pioneer works, which focused on a parameter. This research combines several aspects to determine the effect of rivers and various water sources on the hydroturbine.
Details
Keywords
Adetunji Kamoli, Razali Adul Hamid and Syamsul Hendra Bin Mahmud
Under-reporting of an occupational accident is commonly found at both organisational and individual levels. It interferes with the reality of health and safety in organisations…
Abstract
Under-reporting of an occupational accident is commonly found at both organisational and individual levels. It interferes with the reality of health and safety in organisations and countries. It also hinders the ability to identify trends, recognise priorities, improve strategies, and allocation of resources for accident prevention. This study examined the reasons for the under-reporting of occupational accidents at the organisation level in the Nigerian construction industry. A review of the literature was conducted on the under-reporting of occupational accidents. Thereafter, a field survey with questionnaires was distributed to solicit information from the Nigerian construction professionals in the Federal Capital Territory, Abuja, Nigeria. 300 questionnaires were distributed, and 235 responses were received and analysed with Microsoft Excel and SPSS software by applied relative importance index and ranked. The study found that among the top-ranked reasons for under-reporting of occupational accidents by the organisation is to maintain a reputation. It is therefore important to increase awareness on the reporting of occupational accidents and its importance in accident prevention programmes by the regulatory bodies. Also, more collaborative efforts, standards, and policies should be put in place by the governments for ensuring reporting and record-keeping of accidents in the Nigerian construction industry. Records of dangerous incidents are the key indicator for the organisation for the improvement in the prevention of hazards. The study, therefore, concludes that there should be proper recording and surveillance of occupational accidents, hazards, and their related background causes in reaction to quick and complex variations in work-life.