Вентиляция

Moisture release from open water surfaces

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Bog'liq
6 lesson Ventilation

a is the factor of the speed of movement (mobility) of the environment, the values of parameter a are in the table.
V - relative speed of air movement above the evaporation surface, m/s
P1 is the water vapor pressure corresponding to saturated steam at water temperature (if evaporation occurs without heat input, then P1 is the ambient air temperature according to a wet thermometer).
P2 - water vapor pressure in air, mm.mer.pillar
760 mm.mer.pillar - normal atmospheric pressure.
Pbar - design pressure for a given point, mmHg.
F - water surface area, sq.m.

If materials or semi-finished products are dried indoors, the release of moisture from them is determined by the gravimetric method. The materials are weighed before and after drying, and the difference in weight is the mass of water evaporated.

The amount of moisture released during chemical reactions depends on the mass of the reagents and the reaction scheme.
For example, the combustion of 1 kg of gasoline produces 1.4 kg of water, and the combustion of 1 kg of hydrogen produces as much as 9 kg of water

If there are wet surfaces in the room (floors, equipment, etc.), then moisture release from them is approximately calculated using the formula:

Here W (kg/hour) is the total amount of moisture from the wet surface, F is the surface area, sq.m., tc and tm are the air temperature in the room according to the dry and wet thermometer, respectively.

With proper operation of equipment and communications, water vapor breakthrough is insignificant and can be neglected. But in some cases it needs to be taken into account. Then the breakthrough of steam through leaks is estimated as 2% of the steam generated in the equipment or flowing through communications.

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