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Investor Presentaiton

Energies 2019, 12, 3658 Global potential [EJ/yr] (log scale) 103 Theoretical Technical Jo 100 9 of 37 10-1 Wave * Tide "Ocean Thermal Salinity current gradient gradient * Referred to the Gulf Stream The bars depict the range of the estimated values Figure 3. Summary of the global ocean renewable energy resources. 3.2. Conversion Technologies 3.2.1. Wave Energy Conversion Currently, there are a large number of concepts and patents on the use of wave energy. As illustrated in Figure 4, the process of the wave energy conversion can be divided into three main stages: the primary conversion stage, the secondary conversion stage, and the tertiary conversion stage [72]. In the primary conversion stage, the wave converter captures the kinetic energy of the waves through wave body interactions (e.g., buoy oscillation, air flow, or water flow). The secondary conversion stage converts the body motion energy into electricity through the power take-off (PTO) system, and the tertiary stage adapts the characteristics of the produced power to the grid requirements with power electronic interfaces. Primary conversion stage Secondary conversion stage Tertiary conversion stage Wave motion Body motion PTO Generator PTO Electricity Power electronic interface Grid Figure 4. Main stages of wave energy conversion. Based on the working principles of the WEC, from the primary conversion stage to the secondary conversion stage, the general categories are classified as shown in Figure 5 [72-75]: The oscillating water column (OWC), which compresses or decompresses the air in a chamber using the wave elevation to drive a Wells or impulse turbine to convert wave power. Depending on the location of installation, OWC devices can be fixed onshore [76-78], as shown in Figure 6a, or floating, as shown in Figure 6b [79-81]. Wave activated bodies (WABs), which utilize the wave excitation motions between two bodies to convert wave power into electric power. According to their dimension and orientation, WABS can also be classified as terminators [82] (Figure 6c), positioned with large horizontal extensions perpendicular to the wave propagation direction); attenuators [83,84] (Figure 6d), which have a large horizontal extension parallel to the wave propagation direction; point absorbers [85,86] (Figure 6e), which have small dimensions compared to the predominant wavelength and are usually axisymmetric about their vertical axis; and submerged pressure differentials [87] (Figure 6f), which are submerged buoys with large dimensions.
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