Renewable Energy Resources

Twidell, John; Weir, Tony

doi:10.4324/9780203989302

Cited by 227 publications

(93 citation statements)

References 1 publication

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“…This system can be easily designed and developed for electricity load ranging from single home to small building and industry [28].Generally, micro hydropower systems do not need large dams or reservoirs, with water from a river is partially diverted through an intake canal to a forebay tank, and then fed via penstock to a lower elevation. The water turbine, normally sheltered in a power house, transforms the energy in the water flow into electrical energy, with power generation efficiencies able to reach up to 90% [6]. There are two main types of turbine, impulse and reaction, each suitable for different types of environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Notice of Violation of IEEE Publication Principles: Computational and experimental investigation of runner for gravitational water vortex power plant

Dhakal

Bajracharya

Shakya

et al. 2017

2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA)

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Abstract-The gravitational water vortex power plant (GWVPP) is a new type of low head turbine system in which a channel and basin structure is used to form a vortex, where the rotational energy from the water can be extracted through a runner. This study is focused on the optimization of the runner to improve the efficiency of the GWVPP. Computational fluid dynamics (CFD) analysis is carried out on three different runner designs with straight, twisted and curved blade profiles. ANSYS CFX was used to analyze the fluid flow through the channel, basin, turbine hub and blade, and results were used to evaluate the efficiency of each of the runner designs. The CFD analysis showed curved blade profile to be the most efficient profile, with a peak efficiency of 82%, compared to 46% for the straight blade runner and 63% for the twisted blade version. An experimental test of the turbine system was carried out to validate the runner analysis, in a scale version of the GWVPP. The testing showed that the runner behaved as predicted from the CFD analysis, and had a peak efficiency point of 71% at 0.5m head.

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Section: Introductionmentioning

confidence: 99%

Notice of Violation of IEEE Publication Principles: Computational and experimental investigation of runner for gravitational water vortex power plant

Dhakal

Bajracharya

Shakya

et al. 2017

2017 IEEE 6th International Conference on Renewable Energy Research and Applications (ICRERA)

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“…The kinetic energy contained within these marine currents can be harnessed using various technologies. The physics is similar to that of wind energy [2], where the power available at any particular site is proportional to the fluid density and the cube of its velocity [3,4]. The biggest difference between the two resources is the density of the working fluid [5].…”

mentioning

confidence: 90%

Marine current energy devices: Current status and possible future applications in Ireland

Rourke¹,

Boyle²,

Reynolds³

2010

Renewable and Sustainable Energy Reviews

193

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There is a growing demand for the use of renewable energy technologies to generate electricity due to concerns over climate change. The oceans provide a huge potential resource of energy. Energy extraction using marine current energy devices (MCEDs) offers a sustainable alternative to conventional sources and a predictable alternative to other renewable energy technologies. A MCED utilises the kinetic energy of the tides as opposed to the potential energy which is utilised by a tidal barrage. Over the past decade MCEDs have become an increasingly popular method of energy extraction. However, marine current energy technology is still not economically viable on a large scale due to its current stage of development. Ireland has an excellent marine current energy resource as it is an island nation and experiences excellent marine current flows. This paper reviews marine current energy devices, including a detailed up-to-date description of the current status of development. Issues such as network integration, economics, and environmental implications are addressed as well as the application and costs of MCEDs in Ireland.

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“…Efisiensi memasak dapat ditingkatkan dengan menggunakan bahan bakar kering, tempat pembakaran tertutup atau tungku, dan panci yang benar-benar tertutup. Dengan tindakan ini dan lainnya, efisiensi panas dapat ditingkatkan hingga sekitar 20% (Twidell dan Weir 2006). Jika arang digunakan sebagai ganti kayu, sebagian energi hilang dalam proses pembakaran, tetapi efisiensi panas dalam memasak lebih baik.…”

Section: Memasak Secara Lebih Efektifunclassified

Mewujudkan REDD+: strategi nasional dan berbagai pilihan kebijakan

Angelsen¹,

Brockhaus²,

Kanninen³

et al. 2010

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Renewable Energy Resources

Cited by 227 publications

References 1 publication

Notice of Violation of IEEE Publication Principles: Computational and experimental investigation of runner for gravitational water vortex power plant

Notice of Violation of IEEE Publication Principles: Computational and experimental investigation of runner for gravitational water vortex power plant

Marine current energy devices: Current status and possible future applications in Ireland

Mewujudkan REDD+: strategi nasional dan berbagai pilihan kebijakan

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