Community Research and Development Information Service - CORDIS

The hose pump wave energy converter

The hose pump wave energy converter has been tested in Lake Lygnem South of Goeteborg (1980-1981). The 5 converters were interconnected by a main pipe drawn ashore to a Pelton turbine and generator. This system gave good results and experience to increase the size and move into the sea. During 1983 to 1984 a demonstration plant consisting of 3 converters with a main pipe and turbine/generator ashore was tested in Kattegatt. In 1986/1987 a hose pump lightbuoy was developed and sold to Pharos Marine Ltd, United Kingdom. This buoy is now undergoing preserial production tests.

The results from the trials have been used to verify a 1-dimensional time-domain mathematical model that simulates the behaviour of 1 converter. The input to the model is converter data and 1-dimensional wave time series generated by software. This software gives the vertical coordinate of the sea surface from a given spectrum and a given significant wave height/mean wave time period pair. The mathematical model is used to calculate the possible energy capture on different sites. Along with the mathematical modelling a method for estimating yearly energy production has been developed. Economic evaluations of wave power plants designed for different sites have been undertaken. The most thorough one is the Bremanger study which involves: energy production, electrical system, electrical losses, installation procedure, operation and maintenance, and cost evaluation. A similar study has been done for the Baltic Sea. The last 2 studies have been scrutinized by the Swedish State Power Board.

Due to the lack of government funding a hose pump wave energy power plant has not yet been a reality in spite of the low energy cost per kWh.

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