(a) Compare the average power (kW/m) in waves with 2.5 m significant wave height versus 2 m height if both have a peak wave period of 9 s. [2 Marks + 2 Marks] (b) Calculate the energy (kWh'/m) delivered by the waves with significant wave heights between 1 m and 2.75 m during August. [8 Marks] (c) Calculate the delivered energy by the 1-MW turbine with a scatter diagram given in the Table 4.2, in August for the waves between 1.5 m and 2.5 m. Assume 98% availability, an 95% directionality factor, and a 95% efficient generator. [8 Marks) QUESTION 3 [Total 20 marks] Table 4.1 is an hours-per-month wave scatter diagram for the month of August for a buoy. Table 4.1 Hours-per-month wave scatter diagram Peak Wave Period T, (s) Hs (m) 3.0 2.5 3 4 6 8 9. 10 11 12 17 20 2 1 3 9. 2 2.0 4 19 42 12 7 4 1.5 24 52 74 32 19 9. 6. 9. 15 1.0 4 10 30 37 68 42 28 16 16 47 40 0.5 3. 9. 3 2 9 4 0.0 Table 4.2 Scatter Diagram for Power Delivered by a 1-MW Wave Generator" (kW) 4 5 6 7 Peak Wave Period Tp (s) 8 9 10 11 Hs(m) 3 12 14 17 20 8.5 60 137 195 259 308 364 444 555 700 860 1000 1000 1000 8.0 64 146 207 275 327 387 471 589 742 913 1000 1000 1000 7.5 67 154 218 290 345 409 498 622 784 965 1000 1000 1000 7.0 71 162 229 305 363 429 523 653 824 1000 1000 1000 1000 6.5 74 168 239 317 378 447 544 680 857 1000 1000 1000 1000 6.0 76 173 246 326 388 459 560 699 882 1000 1000 1000 1000 5.5 76 174 248 329 393 464 566 708 891 1000 1000 1000 1000 5.0 78 174 247 327 389 462 561 699 885 1000 1000 1000 1000 4.5 91 171 244 315 375 448 548 674 864 1000 1000 1000 1000 4.0 133 170 229 304 360 422 511 643 814 988 1000 1000 1000 3.5 100 165 232 293 340 401 486 601 754 916 1000 1000 1000 3.0 120 179 230 268 303 344 411 509 643 781 911 926 1000 2.5 73 118 163 196 231 269 325 401 500 596 699 652 652 2.0 58 93 125 151 173 199 237 285 348 413 455 444 776 1.5 44 67 86 101 110 120 132 164 183 226 317 332 234 1.0 25 37 47 53 50 57 64 105 132 140 152 122 3 0.5 12 16 18 23 11 15 24 7 8. 23 10 13 0.125 1 3 4. 6 7 10 11 12 Energetech OWC WEC; Previsic et al. (2004). 4lo o m lc Elo n o 5o5O