Air pollution in industrial enterprises

Airborne pumps

basic principle of ventilation

Centrifugal exhaust veshilyatory

Determination of air exchange

dust control

Exhaust System

Forced ventilation on confectionery

Hourly values

mist of water vapor

pressure loss in the flare emissions

radioactive dust

scheme of the central pressure inlet system

Special prechamber

temperature gradient

Ventilation at bakeries

Ventilation in the Confectionery Factory

ventilation when dealing with heat



Vlagovydeleniya in the air of industrial premises occur mainly as follows:

directly into the room;

with the air more humid than the indoor air (including people with breathing);
from open water surfaces or wetted materials due to their own heat or by heat supplied from outside;

with boiling water;

with cold surfaces wetted by the heat from the ambient air;

as a result of chemical reactions.

This exhausts the possible cases of industrial vlagovydeleniya. It should be noted vlagovydeleniya process by evaporation from the wetted surface of the cold when the heat in the form of heat of vaporization does not come into the room and does not affect the heat balance. This is a typical case of evaporation from the wet floor, where water is a long time and takes the wet-bulb temperature. Borrowed from the room sensible heat (dry), and returned to the room the same amount of heat, but in a cryptic form (heat of vaporization).

The amount of moisture that evaporates from an open water surface at normal barometric pressure is determined by the formula. Gravitational factor mobility environment to room temperature from 15 to f - \ - C;

c - velocity of air above the mirror evaporation in m / sec;
p ---- elasticity of water vapor saturating the air at the surface of evaporating water, in mm Hg. Art.;
Pi - the elasticity of water vapor in the ambient air, corresponding to its degree of saturation in mm Hg. Art.; F surface evaporation in m-. If the temperature of the evaporating liquid is kept constant, the temperature of surface evaporation during quiet surface is taken from Table. 6.
Factor value of the gravitational mobility and can be taken from Table. 7.

With a calm surface evaporation and known its size quantification evaporating moisture easily. Situation is more complicated if the liquid surface is uneven, such as the allocation of its gas, while stirring.

The temperature of the evaporation surface, depending on the temperature of the liquid for a calm surface and parameters of indoor air purging air. In this case, the surface evaporation increases dramatically and should be increased to 1,5 - 2,5 times. While the temperature evaporating liquid is taken 10-15% lower than in the quiet surface evaporation.

If you have an uneven surface wetted materials (such as fabric, wood), it is recommended to increase the surface evaporation by 2-3 times. For a mother who folds can be taken maximum increase of the surface. For other wet materials (wood, loose) a threefold increase in the surface may be acceptable only in cases of exceptional.