How to calculate the dryness of water vapor?
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How to calculate the dryness of water vapor?
How to calculate the dryness of water vapor? Is the dryness degree of saturated water vapor 100%? Last edited in this post by *ongconggui on 2008-2-25 16:24]
The ratio of the weight of steam in the vapor-liquid mixture to the weight of the entire mixture is called the dryness degree of the saturated water vapor, denoted by χ. Obviously, χ=0 corresponds to saturated water ； χ=1 corresponds to dry saturated steam ； 0＜χ＜1 refers to wet saturated steam. In a boiler, the water in the drum water volume has χ=0, while the steam-water mixture in the water wall has 0＜χ＜1. The steam obtained from the separation of the soda mixture by the steam-soda separation device in the drum can be considered to have χ=1.
It is necessary to know the pressure, temperature, specific volume, or enthalpy value in order to make the calculation. Check out heat transfer theory, or use some software for the calculation. The definition is simple: dryness fraction – the percentage of the mass of dry steam within wet steam compared to the total mass of wet steam. Last edited by ssmith2007 on 2008-2-27 23:22
Can there be a dryness degree below the saturation temperature?
The dryness fraction of superheated steam is 1, while that of wet steam is less than 1; it needs to be determined based on any two thermodynamic properties, and there are specific calculation software available for this purpose.