Mollier Chart Water Metric

Overview

Engineering reference data for Mollier Chart Water Metric in steam condensate.

Key Formulas

Steam Quality

$x = \frac{m_v}{m_{total}}$

Mass fraction of vapor in two-phase mixture.

Enthalpy of Wet Steam

$h = h_f + x \cdot h_{fg}$

Specific enthalpy of wet steam.

Flash Steam

$m_{flash} = m_{liquid} \frac{h_f - h_{f2}}{h_{fg2}}$

Steam generated when condensate flashes to lower pressure.

Condensate Load

$m_c = \frac{Q}{h_{fg}}$

Condensate generated by heat transfer.

Variables

How to Use This Chart

The Mollier chart is a graphical representation of thermodynamic properties of water/steam. It is an essential tool for engineers working on steam power cycles, HVAC systems, and industrial processes.

• Primary Axes: The chart typically plots Specific Enthalpy (h) on the x-axis and Pressure (P) on the y-axis (often on a logarithmic scale).
• Key Lines: Constant lines for Temperature (T), Quality (x), Entropy (s), and Specific Volume (v) are overlaid.
• Property Lookup: To find a state point, locate the intersection of known properties (e.g., pressure and temperature). All other properties at that point can then be read from the chart.
• Process Visualization: Thermodynamic processes (isentropic expansion, isobaric heating) can be plotted directly on the chart to determine work and heat transfer.

This visual tool complements the numerical formulas provided in the Key Formulas section by offering an intuitive way to understand steam behavior and cycle analysis.

References

• Original Source