Psychrometrics: Calculations of the mass flow rate of the dry air component (assumed constant under steady state) from the ENTRY volumetric flow rate of the humid air mixture MUST use the INITIAL state variables!
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There are special cases where the volumetric flow rate of the humid air mixture does not change, but typically, it may, while the mass flow rate of the dry air component is usually treated as constant under steady state (no loss of dry air from the system):
