Frequency [Hz]

Process

Pipe

$\overline{U}$

[W/(m²K)]

${\overline{h}}_{ext}$

[W/(m²K)]

${\overline{h}}_{int}$

[W/(m²K)]

35

Heating

1

192

6324

228

2

331

49,741

385

3

241

49,567

277

Cooling

1

239

2117

314

2

230

11,717

271

3

239

13,281

252

Slow cooling

1

225

1888

300

2

212

7375

254

3

234

7374

289

50

Heating

1

540

37,900

641

2

265

175,799

306

3

204

12,992

231

Cooling

1

390

3219

451

2

383

12,885

463

3

399

12,885

484

Slow cooling

1

271

2420

360

2

265

16,828

317

3

274

16,827

329