Buoy-Rope-Drum Wave Power System

Zhu, Linsen; Wang, Yangang; Yang, Ze Ying; Qu, Yanming

doi:10.1155/2013/609464

Cited by 4 publications

(5 citation statements)

References 4 publications

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“…Figure 1b shows that, when the buoy heaves downward when waves coming off, the built in coiled spring will reposition the drum by releasing its elastic potential energy and winding the rope back to its initial position. During this stroke, with an overrunning clutch installed between the drum and magnetic steel casing, the magnetic steel casing does not rotate when the drum rotates backward, and the buoyant hull does not generate power during falling [19]. Figure 1c,d show the deployment and in situ status of the prototype BRD WEC at offshore.…”

Section: Brd Wec Structural Breakdownmentioning

confidence: 99%

“…Figure 1c,d show the deployment and in situ status of the prototype BRD WEC at offshore. backward, and the buoyant hull does not generate power during falling [19]. Figure 1c,d show the deployment and in situ status of the prototype BRD WEC at offshore.…”

Section: Brd Wec Structural Breakdownmentioning

confidence: 99%

“…(a) Wave energy extraction stroke; (b) Drum repositioning stroke; (c) BRD WEC transportation; (d) BRD WEC installation[19].…”

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confidence: 99%

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Life Cycle Assessment of a Buoy-Rope-Drum Wave Energy Converter

Zhai

Zhu

2018

Energies

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This study presents a life cycle assessment (LCA) study for a buoy-rope-drum (BRD) wave energy converter (WEC), so as to understand the environmental performance of the BRD WEC by eco-labeling its life cycle stages and processes. The BRD WEC was developed by a research group at Shandong University (Weihai). The WEC consists of three main functional modules including buoy, generator and mooring modules. The designed rated power capacity is 10 kW. The LCA modeling is based on data collected from actual design, prototype manufacturing, installation and onsite sea test. Life cycle inventory (LCI) analysis and life cycle impact analysis (LCIA) were conducted. The analyses show that the most significant environmental impact contributor is identified to be the manufacturing stage of the BRD WEC due to consumption of energy and materials. Potential improvement approaches are proposed in the discussion. The LCI and LCIA assessment results are then benchmarked with results from reported LCA studies of other WECs, tidal energy converters, as well as offshore wind and solar PV systems. This study presents the energy and carbon intensities and paybacks with 387 kJ/kWh, 89 gCO 2 /kWh, 26 months and 23 months respectively. The results show that the energy and carbon intensities of the BRD WEC are slightly larger than, however comparable, in comparison with the referenced WECs, tidal, offshore wind and solar PV systems. A sensitivity analysis was carried out by varying the capacity factor from 20-50%. The energy and carbon intensities could reach as much as 968 kJ/kWh and 222 gCO 2 /kWh respectively while the capacity factor decreasing to 20%. Limitations for this study and scope of future work are discussed in the conclusion.Energies 2018, 11, 2432 2 of 15 to absorb wave energy and convert it to electricity or other forms of energy [4]. Since the beginning of the century, tidal stream technology and wave energy technology development have started to ramp up [5]. Although there no large-scale WEC installation has been reported in the U.S., the U.S. Department of Energy sponsored the Wave Energy Prize in 2015, an 18-month public design-build-test competition to increase the diversity of organizations involved in WEC technology development, while motivating and inspiring existing stakeholders [6]. The UK and Portugal have the vast majority of wave energy deployments in Europe [5]. The Carbon Trust estimates that a contribution of up to 20% of total UK energy generation could be provided by marine energy by 2050 [7,8]. China possesses a total marine area of 4,700,000 km 2 [9]. With annual mean wave power of up to 7.73 kW/m wave front, China has a wave power potential of 128.5 GW, nearly half of the electricity production of China [10,11]. However, the majority of China's wave energies are without any exploitation and thus far, most of the WECs in China are still in concept design or pre-commercial stages. Aiming to stimulate and encourage the marine renewable energy technology research and development, China National Oceanic Admini...

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Section: Brd Wec Structural Breakdownmentioning

confidence: 99%

Section: Brd Wec Structural Breakdownmentioning

confidence: 99%

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Life Cycle Assessment of a Buoy-Rope-Drum Wave Energy Converter

Zhai

Zhu

2018

Energies

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“…The number of pitch motions in a wave period is also carried out in this study. Based on [23], the number of pitch motions is also important information to calculate the potential generated electricity. This study examines the number of pitch motions in a few waves period.…”

Section: Motion Response In Irregular Wavesmentioning

confidence: 99%

Study of Diameter-to-Draft Ratio of Pitch Point Absorber as Wave Energy Converter in Indonesia Waters Based on Boundary Element Method

Aulia,

Athallah,

Albasyir

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Recently, harnessing the energy from low wave energy density areas is concerned to deal with renewable energy targets. The previous study proposed a pitch point absorber with a submerged sectional equivalent area as the design parameter. However, that parameter did not suggest the best sectional area and did not directly correlate with the theory of structure hydrodynamic. Thus, this research proposes the diameter-to-draft ratio as a design parameter for the pitch point absorber. The study was conducted numerically using Boundary Element Method software to investigate diffraction characteristics of the device and analyze structure response in irregular waves. The model was modified with five different diameters and ratios. JONSWAP Spectrum was used to generate wave elevation with a 2-m significant wave height and 10-second peak period. The time domain simulation was set at 10.800 seconds. The result of this study showed that the highest responses occurred when the diameter-to-draft ratio was 5 because it has the closest structure natural frequency to assumed wave frequency, which makes it easier to resonate. In all diameters, the higher ratio affects the range of the structure natural frequency getting farther from the assumed wave, so the responses become smaller.

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“…According to the numerical investigation on ZGM and HP mills by the present author, the distributions of the static pressure and the flow rate are not uniform for different nozzle rings because the primary air enters the mills only from one side [12,13] . Two improved models for the medium speed mill, blocking part of nozzle rings and being a double-inlet structure, were also simulated further [14] . And the results show that such reconstructions could help to improve the mill's performance and obtain a better flow distribution, however, the total pressure drop of mill will increase significantly after the modification.…”

Section: Introductionmentioning

confidence: 99%

Numerical Optimization for Bottom Structure of ZGM Medium Speed Mill

Zhu

Liu

Cheng

2014

AMM

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The inner flow fields in the ZGM95 medium speed mill are numerically simulated by employing the commercial code of FLUENT. The results show that the static pressure and the flow rate at each nozzle ring is different from those of others due to the primary air entering the mill only from one side. Some baffles are proposed to be added in the bottom chamber of the mill to optimize the performance of medium speed mill, and the modified models are also simulated. A couple of fan-shaped baffles, which are arranged symmetrically in the bottom chamber, can improve the distribution of the flow fields efficiently in the mill while few pressure drop of the mill will increase. The structure with fan-shaped baffles is recommended to be an important choice of the structural optimization of the medium speed mill. The numerical investigations also indicate that the structural modification of mill should be as simple as possible.

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Buoy-Rope-Drum Wave Power System

Cited by 4 publications

References 4 publications

Life Cycle Assessment of a Buoy-Rope-Drum Wave Energy Converter

Life Cycle Assessment of a Buoy-Rope-Drum Wave Energy Converter

Study of Diameter-to-Draft Ratio of Pitch Point Absorber as Wave Energy Converter in Indonesia Waters Based on Boundary Element Method

Numerical Optimization for Bottom Structure of ZGM Medium Speed Mill

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