QED Naval and their selected fabricators, Cimpina based in Northern Ireland, are soon to complete the Subhub community demonstrator ready for deployment to EMEC in the next couple of months. Once at EMEC it is intended to use the FORESEA funding to conduct a phased set of sea trials to demonstrate that a tidal array can be installed and recovered in a single offshore operation using small vessel with low date rates.
- Phase 1a installation and recovery trials at the scale tidal test site using replica turbines and equipment allowing marine operators to gain valuable experience of installation method.
- Phase 1b aims to integrate Schottel Hydro SIT-250 turbines providing Subhub with a capacity of 190kW, capable of powering 50 homes. This collaboration includes SME who will be providing their ‘Flipper’ support structure for bi-directional flow, Platform Operation Module (POM), for controlling the platform at EMEC and Subsea Transformer Module (STM) to transmit the grid friendly power ashore.
- Phase 2a will then move operations over to the Falls of Warness site. The aim is to demonstrate the installation and recovery over a wide spectrum of tidal flow and wave heights since the deployment method uses Subhub’s unique submersible stability characteristics that are less sensitive to extreme conditions.
- Phase 2b will demonstrate the long term deployment capabilities, operational stability of its gravity based anchoring system and increased performance characteristics of the turbines which have shown insensitivity to cross flows in tank testing at Flowave. An O&M strategy will be developed for its customers assessing fatigue loads, marine growth and corrosion factors.
- Phase 3 will be used to assess the environmental impacts of a longer term deployment and demonstrate the ability of the Subhub to be quickly and easily decommissioned from the site.
Once this testing is complete it is intended to offer the Subhub for sale and re-use it at another site. All going well Subhub will be further developed utilising a test berth at EMEC with a larger capcity machine rated at 1.2MW. QED Naval is in early stage discussions with several collaborative partners who would like to be involved in this larger scale development due to be deployed in 2018.