Model based feasibility study on bidirectional check valves in wave energy converters

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Abstract

Discrete fluid power force systems have been proposed as the primary stage for Wave Energy Converters (WEC’s) when converting ocean waves into electricity, this to improve the overall efficiency of wave energy devices.

This paper presents a model based feasibility study of using bidirectional check valves in wave energy converters to improve the system efficiency. A single float arm of the Wavestar wave energy converter is modelled including the power take-off (PTO) system. The primary stage of the utilised PTO-system is a discrete fluid power force system consisting of a multi-chamber cylinder and multiple common pressure lines. The valve manifold, employed in the discrete PTO system and conventionally equipped with On/Off valves, is instead considered fitted with bidirectional check valves. The energy output from the primary stage is compared for PTO systems occupying respectively On/Off and bidirectional check valves. Based on the analysis it is found that the energy production may be slightly improved by using bidirectional check valves as compared to on/off valves, due to a decrease in switching losses. Furthermore a reduction in high flow peaks are realised. The downside being increased structural loads in the WEC.
Original languageEnglish
JournalInternational Journal of Marine Energy
Volume5
Pages (from-to)1-23
Number of pages23
ISSN2214-1669
DOIs
Publication statusPublished - Apr 2014

Fingerprint

feasibility study
wave energy
Takeoff
Structural loads
Fluids
fluid
ocean wave
Water waves
peak flow
electricity
Electricity
energy

Keywords

  • Bidirectional check valve
  • Fluid Power
  • PTO
  • WEC

Cite this

@article{b21cb5b255d74d399f07d7225fb032f6,
title = "Model based feasibility study on bidirectional check valves in wave energy converters",
abstract = "Discrete fluid power force systems have been proposed as the primary stage for Wave Energy Converters (WEC’s) when converting ocean waves into electricity, this to improve the overall efficiency of wave energy devices.This paper presents a model based feasibility study of using bidirectional check valves in wave energy converters to improve the system efficiency. A single float arm of the Wavestar wave energy converter is modelled including the power take-off (PTO) system. The primary stage of the utilised PTO-system is a discrete fluid power force system consisting of a multi-chamber cylinder and multiple common pressure lines. The valve manifold, employed in the discrete PTO system and conventionally equipped with On/Off valves, is instead considered fitted with bidirectional check valves. The energy output from the primary stage is compared for PTO systems occupying respectively On/Off and bidirectional check valves. Based on the analysis it is found that the energy production may be slightly improved by using bidirectional check valves as compared to on/off valves, due to a decrease in switching losses. Furthermore a reduction in high flow peaks are realised. The downside being increased structural loads in the WEC.",
keywords = "Bidirectional check valve, Fluid Power, PTO, WEC",
author = "Hansen, {Anders Hedegaard} and Pedersen, {Henrik C.} and Andersen, {Torben Ole}",
year = "2014",
month = "4",
doi = "10.1016/j.ijome.2014.03.001",
language = "English",
volume = "5",
pages = "1--23",
journal = "International Journal of Marine Energy",
issn = "2214-1669",
publisher = "Elsevier",

}

TY - JOUR

T1 - Model based feasibility study on bidirectional check valves in wave energy converters

AU - Hansen, Anders Hedegaard

AU - Pedersen, Henrik C.

AU - Andersen, Torben Ole

PY - 2014/4

Y1 - 2014/4

N2 - Discrete fluid power force systems have been proposed as the primary stage for Wave Energy Converters (WEC’s) when converting ocean waves into electricity, this to improve the overall efficiency of wave energy devices.This paper presents a model based feasibility study of using bidirectional check valves in wave energy converters to improve the system efficiency. A single float arm of the Wavestar wave energy converter is modelled including the power take-off (PTO) system. The primary stage of the utilised PTO-system is a discrete fluid power force system consisting of a multi-chamber cylinder and multiple common pressure lines. The valve manifold, employed in the discrete PTO system and conventionally equipped with On/Off valves, is instead considered fitted with bidirectional check valves. The energy output from the primary stage is compared for PTO systems occupying respectively On/Off and bidirectional check valves. Based on the analysis it is found that the energy production may be slightly improved by using bidirectional check valves as compared to on/off valves, due to a decrease in switching losses. Furthermore a reduction in high flow peaks are realised. The downside being increased structural loads in the WEC.

AB - Discrete fluid power force systems have been proposed as the primary stage for Wave Energy Converters (WEC’s) when converting ocean waves into electricity, this to improve the overall efficiency of wave energy devices.This paper presents a model based feasibility study of using bidirectional check valves in wave energy converters to improve the system efficiency. A single float arm of the Wavestar wave energy converter is modelled including the power take-off (PTO) system. The primary stage of the utilised PTO-system is a discrete fluid power force system consisting of a multi-chamber cylinder and multiple common pressure lines. The valve manifold, employed in the discrete PTO system and conventionally equipped with On/Off valves, is instead considered fitted with bidirectional check valves. The energy output from the primary stage is compared for PTO systems occupying respectively On/Off and bidirectional check valves. Based on the analysis it is found that the energy production may be slightly improved by using bidirectional check valves as compared to on/off valves, due to a decrease in switching losses. Furthermore a reduction in high flow peaks are realised. The downside being increased structural loads in the WEC.

KW - Bidirectional check valve

KW - Fluid Power

KW - PTO

KW - WEC

U2 - 10.1016/j.ijome.2014.03.001

DO - 10.1016/j.ijome.2014.03.001

M3 - Journal article

VL - 5

SP - 1

EP - 23

JO - International Journal of Marine Energy

JF - International Journal of Marine Energy

SN - 2214-1669

ER -