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TECHNICAL PAPERS

By-Pass Air-Valve Control of an OWC Wave Power Plant

[+] Author and Article Information
A. F. de O. Falcão, L. C. Vieira, J. M. C. S. André

Mechanical Engineering Department, Instituto Superior Técnico, 1049-001 Lisbon, Portugal

P. A. P. Justino

Departamento de Energias Renováveis, Instituto Nacional de Engenharia e Tecnologia Industrial, 1600-545 Lisbon, Portugal

J. Offshore Mech. Arct. Eng 125(3), 205-210 (Jul 11, 2003) (6 pages) doi:10.1115/1.1576815 History: Received December 01, 2001; Revised July 01, 2002; Online July 11, 2003
Copyright © 2003 by ASME
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References

Falcão, A. F. de O., 2000, “The Shoreline OWC Wave Power Plant at the Azores,” Proceedings of the Fourth European Wave Energy Conference, Aalborg, Denmark, I. Ostergaard and S. Iversen, eds., pp. 42–48.
Heath, T., Whittaker, T. J. T., and Boake, C. B., 2000, “The Design, Construction and Operation of the LIMPET Wave Energy Converter (Islay, Scotland),” Proceedings of the Fourth European Wave Energy Conference, Aalborg, Denmark, I. Ostergaard and S. Iversen, eds., pp. 49–55.
Raghunathan,  S., 1995, “The Wells Air Turbine for Wave Energy Conversion,” Prog. Aerosp. Sci., 31, pp. 335–386.
Brito-Melo, A., Gato, L. M. C., and Sarmento, A. J. N. A., 2000, “Analysis of Wells Turbine Design Parameters by Numerical Simulation of the OWC Performance,” Proceedings of the Fourth European Wave Energy Conference, Aalborg, Denmark, I. Ostergaard and S. Iversen, eds., pp. 319–326.
Falcão,  A. F. de O., and Justino,  P. A. P., 1999, “OWC Wave Energy Devices with Air Flow Control,” Ocean Eng., 26, pp. 1275–1295.
Justino,  P. A. P., and Falcão,  A. F. de O., 1999, “Rotational Speed Control of an OWC Wave Power Plant,” ASME J. Offshore Mech. Arct. Eng., 65, pp. 65–70.
Vieira, L. C., 2000, “Calculations of the Energy Produced by a Wave Power Plant” (in Portuguese), Internal Report, Instituto Superior Técnico, Lisbon.
Falcão, A. F. de O., and Justino, P. A. P., 1995, “OWC Wave Energy Converters with Valve-constrained Air Flow,” Proceedings of the Second European Wave Power Conference, Lisbon, G. Elliot and K. Diamantaras, eds., pp. 187–194.
Kestin, J., 1966, A Course in Thermodynamics, Blaisdell, Waltham, Massachusetts.

Figures

Grahic Jump Location
Longitudinal cross-section of the plant
Grahic Jump Location
Dimensionless plot of turbine torque Λ (thicker line) and efficiency η=Λ/(ΦΨ) versus pressure head Ψ
Grahic Jump Location
Evolution of valve area A(t) and air pressure p(t) for optimal control. Here, and in Figs. 4 to 6, the thick line represents A(t) and the nearly horizontal lines represent pcr(t)
Grahic Jump Location
As in Fig. 3, for M=∞ and Δt=0.1 s. (a): α1=1,α2=1; (b): α1=0.6,α2=0.33.
Grahic Jump Location
As in Fig. 3, for M=6,Δt=0.2 s,α1=0.6,α2=0.25
Grahic Jump Location
As in Fig. 3, for M=6,Δt=0.2 s,α1=0.6,α2=0.33.(a): no signal noise in pressure measurements; (b): noise amplitude 4% of relative pressure.

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