Executive summary with a set of drawings
(COFEQ) SYSTEM IS DEVELOPED and SUITABLE FOR
Coordinated Floating Offshore Energy Extraction;
Waves, Tidal, Solar, Thermal, Wind and Conventional Power Plants
800 KV DC for MENA Area or Similar Areas-Developed by EE-Capital
The “Coordinated Floating Energy Extraction Equipment”-(COFEQ) is a system for extracting renewable wave energies from: waves, tidal, solar, wind and thermal.
The (COFEQ) system covers offshore energy extraction, energy storage, floating power plants and bridges and 800 KV DC network for MENA Area, European countries bordering the Mediterranean Sea and similar areas.
The system uses simple engineering principles and equipment developed by others that are readily available on the market with proven quality and performance and cooperates with local developers/contractors for its execution.
The (COFEQ) system consists of a “Floating Construction Unit” (FCU) as the building block for the system. The (FCU) is completely assembled onshore, floated and towed to location for mooring to the seabed, with all equipment assembled and ready for operation.
The (FCU) measures 24.75x20.25 (501 SQM) foot print) with 8.6 meters below mean sea level and a roof top for solar energy installation at nine (9) meters above mean sea level. The (FCU) design and configuration can handle severe storms and waves in excess of eight (8) meters including seasonal and daily variations in mean sea levels, and is suitable for installation in deep sea water above fifty (50) meters.
Apart from solar and wave energy extraction, a unique hydro-turbine design extracts tidal energy and Lee Wave energy and converts it to electrical energy.
Adding fixed cuboid or inverted arch floats below the trough line of the highest wave renders the (COFEQ) system suitable for floating wind turbines, handling severe storms with wind speeds up to 210 KMPH at a safety factor of five (5). Hurricane Patricia in the Gulf of Mexico had wind speeds up to 320 KMPH.
The (COFEQ) system can be used for offshore waste storage and respective treatment plants as proposed for New York and already used in Tokyo Bay. It can be used for conventional electric power plants, compressed air storage and as a floating vehicular bridge connecting the wind turbines in existing or new wind turbine farms for ease of operation and maintenance.
Relocating the step-up gear and generator from the Nacelle of the wind turbine to the base of the floating support at the (FCU) deck considerably reduces construction and operation and maintenance costs.
Apart from using (COFEQ) to extract wave, tidal and solar and thermal offshore renewable energies, it can be used as a vehicular bridge interconnecting existing wind farms:
For ease of personnel access for maintenance and operation.
For support of electric transmission cables interconnecting existing wind farms, floating substations and power plants.
The energy outputs per (FCU) is shown in Table-2 below:
Peak Output Hour Output/FCU
System Description and SQM KW/FCU Year KW-H/Year
Wave energy Ø-2m Variable float, 50Ø2 B. Float 1,113.0 (1) 8,700 864,000
Tidal energy, eight (8) Ø-3x1m 8x4 KW 32.0 7,300 233,600
Solar energy per 2 (FCU’s), 1,002 SQM 330.6 2,920 965,352
Solar energy, floating float 245 SQM 73.5 2,920 214,620
Wind turbine 3MW/ 2x6 FCU’s 6,012 SQM 500.0 3,000 1,500,000
The peak output per (FCU) varies between 5 and 1,113 KW for wave heights between 0.75 and 8 meters respectively. The output of 1,113 KW is for 8-m high wave.
A 100MW wind farm using the (COFEQ) system provides the following:
WT FCU ULIFT SOLAR COMPRESSED AIR
Wind Turbine No. /W.T Tons SQM Cubic Metes
3 MW 33 6 704,700 266,800 898,700
7 MW 14 8 400,000 151,000 510,000
The project cost and positive long term cash flow based on sale of produced electrical energy per year and the sale price of one (1) KW-Hour would determine the Return on Investment (ROI), which is estimated above fifteen (15%) percent and makes the project self- financing.
The challenge for owners, developers and Consultants is to request Developers and Contractors to provide an Alternate Bid based on the (COFEQ) system as herein described. This would provide a practical way for Bid Analysis and choice of a competitive system.
Wave calculation and fabrication/construction drawings are available upon request.
Scaled and Full Scale Models
To give a true and factual idea of the performance of the (COFEQ) system, it is necessary to test a full scale model at the project site.
It is a fact that theories and descriptive formulae of a system performance are based on scaled physical experimentation and measurement of performance, and not the other way round of developing a formula to describe physical laws.
Although the attempt to develop formulae to represent true dynamic and physical states of sea and wind are an academic achievement; yet these formulae do not represent actual states at a project site. Actual states as to; wave heights, period, currents, salinity and temperature, and wind states, and physical properties of the floating wind turbine structure are an approximation and a costly process.
It is intriguing to review scaled prototypes for wave energy extraction tested in a portable water tank (1x0.5 m) with complex data acquisition sensors and recorders and insisting to use the horizontal forces of a wave for wave energy extraction. A constructability check should be made.
It is more intriguing to review a two-year proposal of distinguished academics proposing a 1:50 prototype for testing floating wind turbine supports!
At a 1:50 scale, the adhesive forces of water to solid material, the surface smoothness of the floating wind turbine support would play a considerable role. Extrapolating the scaled prototype test results to a full scale system would give a distorted performance result. It would look like a two-meter high nacelle, a one square meter foot print and a 0.2-meter high wave representing an eight-meter wave.
The formulae used in developing the (COFEQ) systems are simple with proven accuracy. Academics must be capable of reviewing these systems and satisfy themselves of the acceptable accuracy of performance of a full-scale model tested under actual physical sea and wind states.
The cost of a 0.5 MW floating wind turbine with necessary “Floating Construction Unit” (FCU)’s would be comparable to the cost of calculating, constructing and testing a 1:50 scaled model. It would look like a two-meter high nacelle, a one square meter foot print and a 0.2-meter high wave representing an eight-meter wave. In addition, the full scale model would provide enough energy output for sale that can render the system self-financing.
Testing a full scale model at project site would provide actual performance of three systems in one pass, namely a coordinated energy extraction system as proposed by (COFEQ); wave, tidal, solar, thermal and floating wind turbines.
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