Contrec - 515-SC04 – Steam Computer

Steam Computer – DP Meter (ISO/Cone)

The 515-SC04 application measures the volume, mass and energy content of steam by using single or stacked differential pressure flow inputs in conjunction with a temperature and/or pressure input.

A selection of various modes makes it suitable for many steam applications. Flow is calculated according to equations for ISO 5167 or V-Cone meters and accurately accounts for thermal expansion effects.

The energy calculations are based on the IAPWS Industrial Formulation (1997) for the thermodynamic properties of steam. Pressure and temperature values are used to determine the specific volume and enthalpy. The instrument also calculates the isentropic exponent and absolute viscosity which are required for the differential flowrate calculations.

Calculations

The steam energy calculations are based on the IAPWS Industrial Formulation (1997).

Superheated steam regions are:
• 0°C < t < 800°C P < 100MPa
• 32°F < t < 1472°F P < 14500psia
• 800°C < t < 2000°C P < 10MPa
• 1472°F < t < 3632°F P < 1450psia

Saturated steam regions are:
• 0°C < t < 374°C (critical temperature)
• 32°F < t < 705°F
• P < 22MPa (critical pressure)
• P < 3190psia

Water region is:
• 0°C < t < t saturation at system pressure
• 32°C < t < t saturation at system pressure

Formulas:
• Volume flow = Mass flow x Specific volume
• Energy flow = Mass flow x Specific enthalpy