Tidal Energy
Conjunctive power output using 2D model
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The key consideration in any tidal energy system is how much energy will be obtained. To achieve this computer modelling must be undertaken. There are 2 main methods in use to calculate the energy yield from tidal range developments
1) 0D or Flat estuary modelling 2) 2D modelling Both of these models provide estimates of the energy yield for a given tidal energy design and operation mode. The 0D model is fast, the 2D model more accurately models the marine environment. |
Flat Estuary Modelling
Energy Yield for varying numbers of Turbines and Sluices
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Flat estuary modelling assumes that the water level within the enclosed basin is flat. Using specified tidal data together with a specified operation method, turbine and sluice designs and numbers of each the energy yield is determined together with the water level inside the basin and power output as a function of time.
These simulations are fast and so many different combinations of operation mode, turbine design and numbers of turbines and sluices can be explored relatively cheaply. A first approximation to the change in intertidal area within the enclosed basin can be obtained from this method, which allows for certain problem designs to be eliminated early in the process, or other potential problems to be flagged up. This is the standard method during the design process of a tidal range scheme to determine the energy yield. |
Water levels inside and outside the basin
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Power output
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CSB Consilium has a range of in house state-of-the-art 0D models which have been used on a number of tidal range schemes throughout the country.
2D Modelling
A more advanced form of energy modelling is often required to provide a better estimate of the energy yield when the basin design has progressed. A number of potential energy losses are added in this form of modelling including a more accurate representation of the driving head across the turbines and sluices and the impact of the wall design around the turbines. Any changes to the driving tide levels, which the building of the tidal energy project may produce, are also included in the 2D model which are not in the quicker 0D model.
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The 2D model is refined around the area of the turbines and sluices to provide maximum fidelity in this region of interest. The turbines are operated in the optimal operation mode as defined through the 0D modelling previously undertaken. The 2D code is also able to run multiple tidal energy schemes conjunctively to show the total energy yield and any potential impact they may have on each other.
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Model of Mersey Tidal Range project
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The 2D model includes the capability to model both tidal range and tidal stream developments. The tidal range turbines are represented using the same data as the 0D model for consistency between the results and the tidal stream devices need to provide their power output curve and the size of their supporting structure. The tidal stream model includes losses due to structural drag and the wake from the device.
The 2D model is based on the ADCIRC model developed in the USA and used for tidal and storm surge predictions, and subsequent flooding risk, throughout the country. The tidal energy extensions were developed by members of the CSB Consilium team over the past 9 years and provides leading tidal energy modelling results. Due to the in-house development of the model any alterations that may be required to answer your questions can be facilitated with relative ease as the expertise in the model remains only with us.
The 2D model is based on the ADCIRC model developed in the USA and used for tidal and storm surge predictions, and subsequent flooding risk, throughout the country. The tidal energy extensions were developed by members of the CSB Consilium team over the past 9 years and provides leading tidal energy modelling results. Due to the in-house development of the model any alterations that may be required to answer your questions can be facilitated with relative ease as the expertise in the model remains only with us.
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Download the file linked here to find a more in depth description and inter-comparison of the two energy modelling approaches and how CSB Consilium's models are consistent and based upon sound foundations.
If you want more information or to discuss the potential for your project then contact CSB Consilium either by phone or email. | ||
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Company Number: 9592955
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VAT Registered: 217309816
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