Humidification Flashcards
science behind the humification processes which refers mainly to the systematized knowledge of the properties of air and water
Psychrometry
- Its broader meaning includes the principles which govern the properties and behavior of mixtures of the so called “fixed” gases with condensable vapors.
Psychrometry
The mass of vapor carried by a unit mass of vapor-free gas
Saturation/Humidity
Saturation Equation
S= (M_a/M_b) * p_a/(P-p_a)
Where,
* PA – the partial pressure of the vapor in the mixture
* P - the total pressure (usually atmospheric unless otherwise specified)
* MA, MB – the molecular weights of components A and B, respectively
A gas in which the vapor is in equilibrium with the liquid at the gas temperature and pressure
Saturated Gas
—– temp, —– capacity to hold vapor
higher, higher
—– pressure, —- capacity for vapor
higher, lesser
in this condition, there would be higher tendency for vapor to condense
at this point the partial pressure of that vapor in the gas mixture is equal to the saturation pressure of that vapor at a particular pressure and temperature.
Saturated Gas
A gas in which the water vapor is in equilibrium with the liquid water at the gas temperature and pressure.
Saturated Air
- Ratio of the partial pressure of the vapor to the vapor pressure of the liquid at the gas temperature and pressure.
Relative Saturation, RS
Relative Saturation formula
%RS = (Pa/P*sat) x 100%
Saturated Gas Formula
Psat*=pa
Ratio of the actual saturation S (actual humidity, H) to the maximum saturation Smax (saturation humidity, HS) at the gas temperature and pressure.
Percentage Saturation
%S =
%S=S/S_max ×100%
=(pa/(P-pa ))/((Psat)/(P-Psat ))×100%
=%RS (P-Psat)/(P-pa )
- the temperature at which the vapor just starts to condense
Dew Point