DOT 500 Aqua

DOT 500 - Seawater pump development

Publieke samenvatting / Public summary

Offshore wind has developed incrementally from onshore turbines being enlarged for offshore use resulting in high €/kWh. Since 2008 the Delft Offshore Turbine concept has been tackling this challenge via a holistic design approach and currently the DOT technology is being tested bij DOT BV in a 500kW prototype.

The DOT development aims at reducing the price of the offshore windturbine by 50%. To achieve this, DOT replaces the heavy coper generator and other ancillary installation in the nacelle by a sea water pump. This reduces 75% of the content and 50% of the weight of the nacelle as well as a reduction of 40% in the support structure.

Korte omschrijving
Since the needed drive train technology is not available on the market the next step for DOT is the development of a dedicated seawater pump. In this project a mediom scale prototype of a dedicated seawater pump will be designed, build and tested in an indoor test set-up. The foreseen steps in this project are: 1. Design & Prototyping towards the best Camring-Piston Shoe lubrication and bearing technology; 2. Design & Prototyping towards the best Cylinder technology; 3. Design, build & test a medium scale Seawater Pump prototype. The desing will benefit from the previous phases within the DOT development in which a 500kW drive train concept, using off the shelf oil pumps was developed, tested and then opreated in the real wind.

The goal of the project is to have a tested low speed/high torque radial piston seawater pump technology which meets all the requirements and is ready for scaling up towards a 3 - 7 MW pump needed for the full scale DOT demonstration phases. Therefore the main objective is to develop an efficient, robust and easy to maintain seawater pump, with the following design requirements: - Efficiency > 85% - Wear components replace > 2year - Replacing all wear components < 4 hours - Active control of pump displacement step size < cylinder volume - Scalable into a full scale 3 - 7 MW design