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

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ventilation when dealing with moisture

As a rule, vlagovydeleniya accompanied by heat. However, if the allocation of water is relatively high, and the related heat dissipation are negligible, we can assume that there is a net vlagovydelenie. These cases include, for example, the allocation of water vapor with large surfaces at low temperature, the pair breaks into the room, drying wet materials, etc.

As is known, d diagram of the beam angle to the horizontal axis, the tangent of which bears the name of the slope depends on the ratio of the amount of heat involved in the process, to the amount of moisture. The foregoing is expressed by the following mathematical relationship.

It is difficult to determine the boundary between pure vlagovydeleniem and joint release moisture and heat. For practical purposes, can be conventionally considered clean vlagovydeleniem (ignore the accompanying heat) all cases, characterized by the value of the slope of the rj-<700-i-800. Processes occurring on the line with the value of the slope (angular size), more than 800, should be attributed to the co-generation of heat and moisture.

Consider a numerical example for the case of allocation of water vapor from the surface of the open vats of boiling water. Let the heat from the walls of the vat by his mirrors ([= 2, m2) is 3000 kcal / h; other heat generation in the room no. Heat loss during the transition period 1000 kcal / h. Local shelters do not.

Thus, this case refers to the net vlagovydeleniyu.

Note that in the absence of heat generation and heat value of the slope can not be less than 600. If heat loss exceeds heat production, then Qn is negative, which corresponds to a lack of sensible heat in the room, and the slope takes a value less than 600. Suppose that in the previous example, the heat losses amount to 12 000 kcal / h. Then Qir =- 9000 kcal / h; Qc = 55,000 kcal / h and the slope is 550.

In summer, when heat loss is not, in rooms filled with people who have joint heat n humidity. Number of sensible heat for one person 100 kcal / h, the amount of water vapor 55 s / h. Angular coefficient, Q 0,055

Selection, water vapor at high temperatures, for example evaporation of the mirror bath for t> 60 В° C or boiling, is inevitably accompanied by the formation of fog. At low heat, especially with a lack of sensible heat (heat loss exceeds heat), the question arises about the fight is not with the humidity, and with the fog.