Flash-steam mass fraction calculator
Flash-steam mass fraction
An adiabatic pressure reduction flashes the condensate energy above final saturated liquid.
Units
xflash=hfg,lowhf,high−hf,low
xflash=hfg,lowhf,high−hf,low
Calculator
Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.
Worked example
Given
- hf,high = 280 Btu/lb
- hf,low = 180 Btu/lb
- hfg,low = 950 Btu/lb
xflash=950280−180≈0.1053
Given
- hf,high = 700 kJ/kg
- hf,low = 420 kJ/kg
- hfg,low = 2,260 kJ/kg
xflash=2260700−420≈0.1239
Symbols and units
| Symbol | Meaning | Unit |
|---|
| xflash | flashed vapor mass fraction | — |
| hf,high | initial saturated-liquid enthalpy | Btu/lb |
| hf,low | final saturated-liquid enthalpy | Btu/lb |
| hfg,low | final vaporization enthalpy | Btu/lb |
| Symbol | Meaning | Unit |
|---|
| xflash | flashed vapor mass fraction | — |
| hf,high | initial saturated-liquid enthalpy | kJ/kg |
| hf,low | final saturated-liquid enthalpy | kJ/kg |
| hfg,low | final vaporization enthalpy | kJ/kg |
Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.
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