scholarly journals The Potential of Conversion of Sea Wave Energy to Electric Energy: The Performance of Central Sulawesi West Sea using Oscillating Water Column Technology

2021 ◽  
Vol 926 (1) ◽  
pp. 012073
Author(s):  
Y A Rahman ◽  
Setiyawan
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Electric Energy ◽  
Oscillating Water Column ◽  
Ocean Energy ◽  
Door Opening ◽  
Ocean Wave Energy ◽  
Marine Energy ◽  
Column Technology ◽  
Calculation Results

Abstract With seas area of 70% larger than land, Indonesia encourages the potential for marine energy as an alternative to renewable energy. One of the technologies developed to utilize ocean energy is the Oscillating Water Column (OWC). The OWC method can convert ocean wave energy by using an oscillation column directing wave energy through the OWC door opening to generate electricity. This study aims to determine the magnitude of the waves utilized in West Central Sulawesi’s seas region include Alindau beach, Marana beach, and Kaliburu beach. Based on wave forecasting using wind data for five years, the maximum wave height for five years is 0.20 m. Estimated power from the calculation results obtained a rate significant with an efficiency level of 11.97%. Alindau is a potential location to develop wave energy.

Ocean Wave Energy Conversion Devices Popular Today

1985 ◽  
Vol 9 (2) ◽  
pp. 105-113
Author(s):  
K.C. Watts ◽  
J.W. Graham
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Spectral Response ◽  
Oscillating Water Column ◽  
Energy Devices ◽  
Floating Raft ◽  
Ocean Wave Energy ◽  
The United Kingdom ◽  
Oil Crisis ◽  
Energy Conversion Devices

Wave energy is one source of alternate energy that has fascinated man’s imagination throughout history yet has alluded his ability to tap it economically for domestic use. Considerable interest in harnessing wave energy exists today in a number of parts of the world, prompted to a large extent by the oil crisis of 1973. This paper examines several wave energy devices which are currently being investigated in the United Kingdom, Japan, Norway and the U.S.A. Each is briefly examined in respect to its operating principles, efficiency, advantages, weaknesses and state of development. The devices discussed are: (1) the Kaimei, the floating ship off the coast of Japan; (2) Salter’s nodding duck with its gyroscopic reference frame; (3) the Lancaster flexible bag; (4) the SEA CLAM version of a flexible bag; (5) the NEL oscillating water column fixed rigidly to the ground; (6) the Vickers terminator and attenuator versions of the oscillating water column; (7) the Norwegian use of a “harbour” with an oscillating water column used to increase the device’s range of frequency response; (8) the latching buoy of Norway; and (9) the Bristol cylinder. Also presented are the studies at the Technical University of Nova Scotia of a two hinged floating raft, the DAM ATOLL of U.S.A. origin and a version of an oscillating water column device designed to increase its spectral response.

Peluang Peluang dan tantangan pengembangan teknologi Oscilating Water Column (OWS) di Indonesia.

2021 ◽  
Vol 4 (01) ◽  
pp. 37-42
Author(s):  
Sigit Arrohman ◽  
Dwi Aries Himawanto
Keyword(s):  
Renewable Energy ◽  
Water Column ◽  
Wave Energy ◽  
Ocean Waves ◽  
Primary Energy ◽  
Energy Development ◽  
Ocean Wave ◽  
Oscillating Water Column ◽  
Column System ◽  
Ocean Wave Energy

Renewable energy is one of the government's efforts to increase the source of the national electricity supply and reduce fossil energy sources. Indonesia has the potential to develop renewable energy in the fields of ocean waves, sunlight, water, and geothermal. But of all these, the most promising to become renewable energy development opportunities are water energy, geothermal energy and ocean wave energy. Indonesia as an archipelagic country with an area of ​​1,904,556 km2 which consists of; 17,508 islands, 5.8 million km2 of ocean and 81,290 million km of beach length, the potential for marine energy, especially ocean waves, is very potential to be empowered as new and renewable alternative primary energy, especially for power generation. This ocean wave power plant has been widely developed, including: buoy type technology, overtopping devices technology, oscillating water column technology. Oscillating Water Column (OWC) is an alternative technology to convert ocean wave energy using an oscillating water column system. The ocean wave conversion technology of the OWC system was chosen because it is suitable in areas with steep coastal topography and has a wave height value between 0.2 m to 1.19 m and even exceeds so that the electricity generated is greater. OWC technology which will be developed for the territory of Indonesia has several opportunities and challenges. Opportunities and challenges that will be faced include the potential for waves, the application of OWC to waterways in Indonesia, OWC systems, and technology investment for the prospect of long-term energy development in Indonesia.  

On the Efficiency of Oscillating Water Column (OWC) Devices in Converting Ocean Wave Energy to Electricity Under Weakly Nonlinear Waves

2012 ◽  
Author(s):  
Jean-Roch Nader ◽  
Song-Ping Zhu ◽  
Paul Cooper
Keyword(s):  
Water Column ◽  
Wave Energy ◽  
Ocean Wave ◽  
Recent Effort ◽  
Oscillating Water Column ◽  
Mean Power ◽  
Weakly Nonlinear ◽  
Ocean Wave Energy ◽  
Mean Power Output ◽  
Incident Waves

Oscillating Water Column (OWC) devices are regarded as one of the most promising systems developed to harness ocean wave energy. In this paper, we present some preliminary results of our most recent effort in the research of trying to improve the efficiency of OWCs with a focus on the comparison of incident waves being in the linear and weekly nonlinear regimes. As the results show, the counted-in nonlinearity at the second order could contribute to more than a 50% increase in the maximum mean power output.

scholarly journals Ocean Energy Systems Wave Energy Modeling Task 10.4: Numerical Modeling of a Fixed Oscillating Water Column

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1718
Author(s):  
Harry B. Bingham ◽  
Yi-Hsiang Yu ◽  
Kim Nielsen ◽  
Thanh Toan Tran ◽  
Kyong-Hwan Kim ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Free Surface ◽  
Water Column ◽  
Wave Energy ◽  
Potential Flow ◽  
Energy Systems ◽  
Linear Potential ◽  
Oscillating Water Column ◽  
Ocean Energy ◽  
Internal Chamber

This paper reports on an ongoing international effort to establish guidelines for numerical modeling of wave energy converters, initiated by the International Energy Agency Technology Collaboration Program for Ocean Energy Systems. Initial results for point absorbers were presented in previous work, and here we present results for a breakwater-mounted Oscillating Water Column (OWC) device. The experimental model is at scale 1:4 relative to a full-scale installation in a water depth of 12.8 m. The power-extracting air turbine is modeled by an orifice plate of 1–2% of the internal chamber surface area. Measurements of chamber surface elevation, air flow through the orifice, and pressure difference across the orifice are compared with numerical calculations using both weakly-nonlinear potential flow theory and computational fluid dynamics. Both compressible- and incompressible-flow models are considered, and the effects of air compressibility are found to have a significant influence on the motion of the internal chamber surface. Recommendations are made for reducing uncertainties in future experimental campaigns, which are critical to enable firm conclusions to be drawn about the relative accuracy of the numerical models. It is well-known that boundary element method solutions of the linear potential flow problem (e.g., WAMIT) are singular at infinite frequency when panels are placed directly on the free surface. This is problematic for time-domain solutions where the value of the added mass matrix at infinite frequency is critical, especially for OWC chambers, which are modeled by zero-mass elements on the free surface. A straightforward rational procedure is described to replace ad-hoc solutions to this problem that have been proposed in the literature.

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