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Table 7 Extrapolation of Weibull parameters at the respective turbine hub heights

From: Wind energy potential and cost estimation of wind energy conversion systems (WECSs) for electricity generation in the eight selected locations of Tigray region (Ethiopia)

Location

 

z

k

c (m/s)

10 m

30 m

50 m

80 m

10 m

30 m

50 m

80 m

Adigrat

January

0.35

4.1300

4.5720

4.8114

5.0550

1.1401

1.6746

2.0025

2.3605

February

3.5615

3.9426

4.1491

4.3592

1.4026

2.0603

2.4636

2.9041

March

2.9835

3.3028

3.4758

3.6517

1.3912

2.0436

2.4436

2.8806

April

3.5612

3.9423

4.1488

4.3588

1.7425

2.5596

3.0606

3.6079

May

3.1403

3.4764

3.6585

3.8437

1.3764

2.0218

2.4176

2.8498

June

3.9878

4.4146

4.6458

4.8810

1.9112

2.8073

3.3569

3.9571

July

2.8632

3.1697

3.3357

3.5045

1.6994

2.4963

2.9849

3.5187

August

3.0251

3.3488

3.5242

3.7026

1.1139

1.6363

1.9566

2.3064

September

3.5785

3.9615

4.1689

4.3800

0.9104

1.3374

1.5992

1.8851

October

3.7279

4.1269

4.3430

4.5629

1.0386

1.5256

1.8242

2.1504

November

2.3553

2.6074

2.7440

2.8829

1.1015

1.6181

1.9348

2.2808

December

3.6272

4.0154

4.2257

4.4396

0.9955

1.4622

1.7485

2.0611

Adwa

January

0.35

2.7517

3.0462

3.2057

3.3680

0.7872

1.1563

1.3827

1.6299

February

3.4350

3.8027

4.0018

4.2044

1.1568

1.6992

2.0319

2.3952

March

3.1619

3.5003

3.6836

3.8701

1.2415

1.8237

2.1807

2.5707

April

2.4296

2.6896

2.8305

2.9738

1.8115

2.6609

3.1819

3.7508

May

2.5990

2.8772

3.0279

3.1812

1.1078

1.6272

1.9458

2.2937

June

1.8647

2.0643

2.1724

2.2824

1.7154

2.5198

3.0131

3.5518

July

3.7454

4.1463

4.3634

4.5843

1.4670

2.1548

2.5767

3.0374

August

2.7143

3.0048

3.1621

3.3222

1.3353

1.9614

2.3453

2.7647

September

2.7699

3.0663

3.2269

3.3903

0.8850

1.2999

1.5544

1.8323

October

2.0210

2.2373

2.3545

2.4737

0.9276

1.3625

1.6292

1.9205

November

2.4296

2.6896

2.8305

2.9738

1.8115

2.6609

3.1819

3.7508

December

4.6900

5.1919

5.4638

5.7404

0.7492

1.1005

1.3159

1.5512

Atsbi

January

0.28

4.3232

4.7859

5.0366

5.2915

2.4276

3.3019

3.8096

4.3454

February

4.2743

4.7317

4.9795

5.2316

2.6316

3.5794

4.1298

4.7107

March

4.4089

4.8808

5.1364

5.3964

2.9278

3.9823

4.5947

5.2409

April

4.0003

4.4284

4.6603

4.8962

3.6379

4.9481

5.7090

6.5120

May

4.0134

4.4430

4.6756

4.9123

2.8710

3.9051

4.5055

5.1393

June

4.3283

4.7915

5.0424

5.2977

3.3241

4.5213

5.2166

5.9503

July

4.2745

4.7320

4.9798

5.2319

3.0253

4.1150

4.7477

5.4155

August

4.4089

4.8808

5.1364

5.3964

2.9278

3.9823

4.5947

5.2409

September

4.2337

4.6868

4.9322

5.1819

2.6216

3.5658

4.1141

4.6927

October

3.7738

4.1777

4.3965

4.6191

2.7442

3.7325

4.3065

4.9122

November

4.1554

4.6001

4.8410

5.0861

2.5065

3.4093

3.9335

4.4868

December

4.6900

5.1919

5.4638

5.7404

2.5617

3.4843

4.0201

4.5856

Chercher

January

0.28

3.9986

4.4266

4.6584

4.8942

2.6787

3.6435

4.2038

4.7950

February

4.1398

4.5829

4.8229

5.0670

3.0713

4.1775

4.8198

5.4978

March

4.0535

4.4873

4.7223

4.9614

3.2356

4.4010

5.0777

5.7919

April

4.1105

4.5504

4.7887

5.0311

3.4717

4.7222

5.4483

6.2146

May

2.9666

3.2841

3.4561

3.6310

2.7462

3.7353

4.3097

4.9158

June

4.3182

4.7804

5.0307

5.2854

3.1095

4.2295

4.8798

5.5662

July

4.1130

4.5532

4.7917

5.0342

3.4147

4.6446

5.3588

6.1125

August

3.4328

3.8002

3.9992

4.2017

2.8800

3.9173

4.5197

5.1554

September

2.3286

2.5778

2.7128

2.8501

1.8439

2.5080

2.8937

3.3007

October

3.8455

4.2570

4.4800

4.7068

2.0912

2.8443

3.2817

3.7433

November

4.3051

4.7658

5.0154

5.2693

2.6974

3.6690

4.2331

4.8285

December

3.8484

4.2603

4.4834

4.7104

2.7268

3.7089

4.2792

4.8811

Maychew

January

0.34

4.0945

4.5327

4.7701

5.0115

1.2894

1.8733

2.2286

2.6147

February

4.2019

4.6516

4.8952

5.1430

1.2604

1.8312

2.1785

2.5560

March

4.0472

4.4803

4.7149

4.9536

1.4485

2.1044

2.5036

2.9374

April

4.1644

4.6101

4.8515

5.0971

1.5273

2.2189

2.6398

3.0972

May

3.4913

3.8649

4.0673

4.2732

1.2293

1.7860

2.1247

2.4929

June

3.3639

3.7239

3.9190

4.1174

2.0437

2.9692

3.5324

4.1445

July

3.1193

3.4531

3.6340

3.8179

3.0385

4.4145

5.2518

6.1618

August

2.5274

2.7979

2.9444

3.0934

2.2501

3.2691

3.8891

4.5630

September

2.3188

2.5670

2.7014

2.8381

1.3064

1.8980

2.2580

2.6492

October

4.3457

4.8108

5.0627

5.3190

0.9688

1.4075

1.6744

1.9646

November

4.2322

4.6851

4.9305

5.1801

0.9800

1.4238

1.6938

1.9873

December

4.5303

5.0151

5.2778

5.5449

1.1569

1.6808

1.9996

2.3461

Mekele

January

0.26

3.7277

4.1266

4.3427

4.5626

5.1047

6.7923

7.7571

8.7654

February

3.7012

4.0974

4.3119

4.5302

5.2762

7.0205

8.0177

9.0599

March

3.5996

3.9849

4.1936

4.4059

5.6160

7.4727

8.5341

9.6434

April

3.9446

4.3668

4.5955

4.8281

5.5802

7.4251

8.4798

9.5820

May

3.4722

3.8438

4.0451

4.2499

3.8991

5.1882

5.9252

6.6953

June

3.7329

4.1324

4.3488

4.5689

2.4934

3.3178

3.7890

4.2815

July

3.7629

4.1657

4.3838

4.6057

2.3174

3.0835

3.5215

3.9793

August

3.6524

4.0433

4.2551

4.4705

2.1088

2.8060

3.2045

3.6210

September

3.6375

4.0268

4.2377

4.4522

1.9027

2.5318

2.8914

3.2672

October

4.0671

4.5024

4.7382

4.9781

3.5171

4.6798

5.3446

6.0393

November

3.9021

4.3197

4.5460

4.7761

4.0150

5.3425

6.1013

6.8943

December

3.7464

4.1473

4.3645

4.5855

4.5729

6.0847

6.9490

7.8522

Senkata

January

0.29

4.4550

4.9318

5.1900

5.4528

2.1089

2.9001

3.3632

3.8543

February

4.1077

4.5473

4.7854

5.0277

2.8510

3.9207

4.5468

5.2107

March

4.0203

4.4506

4.6837

4.9208

2.5936

3.5667

4.1362

4.7402

April

3.8406

4.2516

4.4743

4.7008

3.4536

4.7494

5.5078

6.3121

May

2.9440

3.2591

3.4298

3.6034

2.7434

3.7727

4.3751

5.0140

June

3.3286

3.6848

3.8778

4.0741

2.5110

3.4531

4.0045

4.5893

July

3.7171

4.1149

4.3304

4.5496

1.6743

2.3026

2.6702

3.0601

August

3.1940

3.5358

3.7210

3.9093

1.5891

2.1854

2.5343

2.9044

September

2.8560

3.1617

3.3273

3.4957

2.1577

2.9672

3.4410

3.9435

October

3.3604

3.7200

3.9148

4.1130

2.8124

3.8676

4.4852

5.1402

November

3.5392

3.9180

4.1232

4.3319

2.3465

3.2269

3.7421

4.2886

December

3.4475

3.8165

4.0164

4.2197

2.2843

3.1413

3.6429

4.1748

Shire

January

0.36

3.1719

3.5114

3.6953

3.8824

0.9589

1.4242

1.7117

2.0273

February

4.0354

4.4673

4.7012

4.9392

1.2927

1.9198

2.3074

2.7328

March

3.6173

4.0044

4.2142

4.4275

1.3881

2.0615

2.4777

2.9344

April

3.3588

3.7183

3.9130

4.1111

1.7018

2.5274

3.0377

3.5977

May

3.0845

3.4146

3.5934

3.7753

1.0460

1.5535

1.8671

2.2113

June

3.3780

3.7395

3.9354

4.1346

1.3949

2.0717

2.4899

2.9490

July

3.3203

3.6757

3.8682

4.0640

1.0412

1.5463

1.8585

2.2011

August

3.5002

3.8748

4.0777

4.2842

1.0393

1.5436

1.8552

2.1972

September

3.3089

3.6630

3.8549

4.0500

0.8521

1.2654

1.5209

1.8013

October

2.9207

3.2333

3.4027

3.5749

0.7472

1.1097

1.3337

1.5796

November

3.3588

3.7183

3.9130

4.1111

1.7018

2.5274

3.0377

3.5977

December

4.6900

5.1919

5.4638

5.7404

0.7865

1.1681

1.4039

1.6627