The resultant humidity load usually comes from two different sources. One of them is the human occupation, and the other is some kind of water surface, e.g. a swimming pool, or a fountain in a supermarket.
where
m1p – is the humidity load of one person [g/h,person; kg/h,person]
A water – is the free surface of evaporating water [m²]
β –is the evaporating factor, which depends on the liquid’s material
pvapour,saturation– is the saturation pressure of vapour [Pa].
pvapour – is the partial vapour pressure [Pa]An average adult person’s humidity load in winter state is about 50 [g/h,person], while in summer it is about 65 [g/h,person] due to standard CR 1752. It actually consists of sweating and evaporation.
Based on the above, the calculated airflow rate of supply air in summer is:
where
xex – is the humidity ratio of exhausted air [g/kg; kg/kg]
xsup – is the humidity ratio of supply air [g/kg; kg/kg]
The airflow rate of supply air in winter is:
In most cases, this value is higher in summer than in winter due to the bigger number of summer’s humidity load.
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