Dryness Measurement — Throttling Calorimeter

The true dryness of the line steam from the pressure and temperature measured in the calorimeter.

Unit system

Inputs

Line pressure (absolute)

Calorimeter pressure (absolute)

Usually atmospheric. The lower it is, the more likely the steam leaves superheated.Temperature measured in the calorimeter

Dryness in the line

0.9598

Moisture fraction

0.0402

Verdict	Acceptable, but a separator would pay
Measured enthalpy	2,696 kJ/kg
Superheat in the calorimeter	10.03 K
Saturation temperature in the line	179.9 °C

Throttling is isenthalpic and the calorimeter is taken as adiabatic; heat loss lowers the measured temperature and understates the dryness.
The method is valid only if the steam is SUPERHEATED in the calorimeter. Otherwise the temperature carries no information about dryness.

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Results are for engineering pre-assessment and are not a product selection commitment. Final responsibility rests with the user.