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17

Pressure and temperature compensation with Prowirl F/R/O 200

Steam distribution network (downstream of valve) > With pressure/temperature compensation p sup = 4 bara (58.8 psi)

Main stream pipe (upstream of valve) p sat = 8 bara (117.6 psi) T sat = 170 °C (228 °F) ρ sat = 4 kg/m³ (0.2497 lbs/ft³) h = 2768 kJ/kg (Enthalpy)

T sup = 157 °C (315 °F), ∆ T sup = 13 K ρ sup = 2 kg/m³ (0.1249 lbs/ft³) h = 2768 kJ/kg (Enthalpy)

Pressure reducing valves

T-s diagram

Steam distribution network (downstream of valve) > Only temperature compensation T sup = 157 °C (315 °F) ρ sat = 3 kg/m³ (0.1873 lbs/ft³)

400

Saturated steam curve

350

h (Enthalpy)

p sat

300

250

p sup

Density value too high by 44%, as saturated steam is mistakenly assumed

200

150

100

1

2

3

4

5

6

7

8

T [°F]

T [°C]

200

390

190

370

p sat (8 bara / 117.6 psi)

180

350

ρ sat (3 kg/m³ / 0.1873 lbs/ft³)

p sup (4 bara / 58.8 psi) ρ sup (2 kg/m³ / 0.1249 lbs/ft³)

170

T sat (170 °C / 338 °F)

330

160

310

T sup (157 °C / 315 °F)

150

h (Enthalpy) 2768 kJ/kg 1190 BTU/lbs

290

140

Saturated steam curve

270

130

6.5

6.6

6.7

6.8

6.9

7.0

7.1

s [kJ/kg]

6.2

6.3

6.4

2.8

2.85

2.9

3.05

s [BTU/lbs]

3.0

2.95

2.7

2.65

2.75