WIND ENERGY SYSTEMS - Cd3wd

More documents

Recommendations

Info

Chapter 4—Wind Turbine Power 4–50 Figure 30: Torque versus rotational speed for low-solidity 10-m-diameter two-bladed propeller. model discussed in Chapter 2 to find the average pressure. 2. An anemometer mounted on the nacelle of an operating downwind propeller type turbine measures an average wind speed of 10 m/s. Estimate the undisturbed wind speed, assuming this anemometer measures the same wind speed as seen by the propeller. 3. The Sandia 17-m turbine has a diameter of 16.7 m, an area of 187 m 2 , and is spinning at 42 r/min. The ambient temperature is 15 o C and the pressure is 83 kPa. For each of the wind speeds 5, 7, 12, and 16 m/s, (a) Find the tip speed ratio. (b) Find the coefficient of performance from Fig. 9. (c) Find the predicted mechanical power output. Compare these values with those given on Fig. 10. 4. An electric utility decides to add 50 MW of wind generation to its system. If the individual units are to be rated at 2 MW in a 13-m/s wind at standard conditions and have efficiencies C pR = 0.32, η mR = 0.94, and η gR = 0.96, what is the required swept area A of each rotor? What is the rotor diameter, if the rotor is a two bladed horizontal axis propeller? Wind Energy Systems by Dr. Gary L. Johnson November 21, 2001
Chapter 4—Wind Turbine Power 4–51 Figure 31: Torque versus rotational speed for Savonius turbine: radius 0.88 m; area 22 m 2 . 5. The MOD-2 wind turbine is rated at 2500 kW at standard conditions in a 12.3 m/s wind speed. Assume a three stage gearbox with rated efficiency of 0.94 and a generator with rated efficiency 0.95, and estimate the output power in a 8 m/s wind speed. Include the effects of lowered efficiency due to lowered power transfer. 6. The NASA-DOE MOD-0 has a rated electrical output of 100 kW, a cut-in wind speed of 3.5 m/s, a rated wind speed of 8 m/s, a rotor diameter of 37.5 m, a fixed rotor rotational speed of 40 r/min, and a generator rotational speed of 1800 r/min. (a) What is the tip speed ratio at rated wind speed? (b) What is the tip speed ratio at cut-in? (c) What is the overall efficiency of the turbine, drive train, and generator if P e = 100 kW when the wind speed is 8 m/s? Assume standard conditions. 7. A MOD-2 wind turbine is delivering a mechanical power P m = 2000 kW at 17.5 r/min to a gearbox with an output speed of 1800 r/min. The gearbox is 92 percent efficient at this power level. (a) What is the average torque in the low speed shaft? Wind Energy Systems by Dr. Gary L. Johnson November 21, 2001
Page 1 and 2:
WIND ENERGY SYSTEMS Electronic Edit
Page 3 and 4:
ii 4 Wind Turbine Power, Energy, an
Page 5 and 6:
iv 9.9 Wind farm Costs.............
Page 7 and 8:
vi and Chapter 8, so we can give a
Page 9 and 10:
Chapter 1—Introduction 1-1 INTROD
Page 11 and 12:
Chapter 1—Introduction 1-3 same w
Page 13 and 14:
Chapter 1—Introduction 1-5 Thomas
Page 15 and 16:
Chapter 1—Introduction 1-7 Figure
Page 17 and 18:
Chapter 1—Introduction 1-9 power
Page 19 and 20:
Chapter 1—Introduction 1-11 servi
Page 21 and 22:
Chapter 1—Introduction 1-13 incre
Page 23 and 24:
Chapter 1—Introduction 1-15 Figur
Page 25 and 26:
Chapter 1—Introduction 1-17 three
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Chapter 1—Introduction 1-23 [9] R
Page 33 and 34:
Chapter 2—Wind Characteristics 2-
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Page 53 and 54:
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Chapter 3—Wind Measurements 3-2 g
Page 103 and 104:
Chapter 3—Wind Measurements 3-4 F
Page 105 and 106:
Chapter 3—Wind Measurements 3-6 i
Page 107 and 108:
Chapter 3—Wind Measurements 3-8 F
Page 109 and 110:
Chapter 3—Wind Measurements 3-10
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
Page 135 and 136: Chapter 3—Wind Measurements 3-36
Page 137 and 138: Chapter 4—Wind Turbine Power 4-1
Page 185: Chapter 4—Wind Turbine Power 4-49
Page 191 and 192: Chapter 5—Electrical Network 5-1
Page 237 and 238:
Chapter 5—Electrical Network 5-47
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Chapter 6—Asynchronous Generators
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Page 289 and 290:
Page 291 and 292:
Page 293 and 294:
Page 295 and 296:
Page 297 and 298:
Chapter 7—Asynchronous Loads 7-2
Page 299 and 300:
Page 301 and 302:
Page 303 and 304:
Page 305 and 306:
Page 307 and 308:
Page 309 and 310:
Page 311 and 312:
Page 313 and 314:
Page 315 and 316:
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
Page 323 and 324:
Page 325 and 326:
Page 327 and 328:
Page 329 and 330:
Page 331 and 332:
Page 333 and 334:
Page 335 and 336:
Page 337 and 338:
Page 339 and 340:
Page 341 and 342:
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Chapter 8—Economics 8-2 are the t
Page 349 and 350:
Chapter 8—Economics 8-4 Table 8.1
Page 351 and 352:
Chapter 8—Economics 8-6 by the di
Page 353 and 354:
Chapter 8—Economics 8-8 understan
Page 355 and 356:
Chapter 8—Economics 8-10 bank at
Page 357 and 358:
Chapter 8—Economics 8-12 i a = 1+
Page 359 and 360:
Chapter 8—Economics 8-14 ( ) 20 1
Page 361 and 362:
Chapter 8—Economics 8-16 and the
Page 363 and 364:
Chapter 8—Economics 8-18 The unit
Page 365 and 366:
Chapter 8—Economics 8-20 L ′ fu
Page 367 and 368:
Chapter 8—Economics 8-22 L ′ vo
Page 369 and 370:
Chapter 8—Economics 8-24 conventi
Page 371 and 372:
Chapter 8—Economics 8-26 7 PROBLE
Page 373 and 374:
Chapter 8—Economics 8-28 [2] Boll
Page 375 and 376:
Chapter 9—Wind Power Plants 9-2 6
Page 377 and 378:
Chapter 9—Wind Power Plants 9-4 w
Page 379 and 380:
Chapter 9—Wind Power Plants 9-6 t
Page 381 and 382:
Chapter 9—Wind Power Plants 9-8 s
Page 383 and 384:
Chapter 9—Wind Power Plants 9-10
Page 385 and 386:
Page 387 and 388:
Page 389 and 390:
Page 391 and 392:
Page 393 and 394:
Page 395 and 396:
Page 397 and 398:
Page 399 and 400:
Page 401 and 402:
Page 403 and 404:
Page 405 and 406:
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Page 417 and 418:
Page 419:
show all

WIND ENERGY SYSTEMS - Cd3wd

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?