sizes suction panel
Sizes suction panels, slotted suction hopper or selected depending on the nature of the pollutant release and the extent of "front" of the selection. Any of the suction should be located as close as possible to the center of the selection hazards. The term "close" we mean the location of slit suction hopper or at a distance of 150-200 mm from the fire hazards, the term "far" - 250-300 mm, respectively. Have a gap or funnel at a distance greater than 350-400 mm, is ineffective. Exceptions are suction panels that may be placed at distances from 300 to 800 mm. Sometimes the suction panels are placed at greater distances, for example, a linear conveyor. For suction panels, the term "close" means a distance of 300-400 mm, the term "far" - 500-800 mm, respectively.
The performance of local suction, in addition to their location determined by the rate aspirated through the living section of the funnel, slots or panels.
For suction panel can recommend that the estimated rate of aspirated in Table. 13.Dlya slit-like suction air velocity in the slots can take the same as for the panels, Fire is somewhat less, given a location close to the site selection hazards. For suction funnel, on the contrary, the rate should be taken somewhat larger than that for panels and joints. For hazardous gases and vapors speed aspirated funnels take up to 10 - 15 m / sec, depending on the location of the crater, its size and nature of the gassing.
At the zonal ventilation performance of a single funnel usually take between 500 and 1000 m / h. Speed aspirated in this case is irrelevant.
For the suction slit in the allocation of low-intensity hazards can take the norm of suction 700 - 1000zh3 / h in 1 running. m length of the gap. This corresponds to a rate of about 4-6 m / sec at a slit width of 50 mm.
The data presented for determining the amount of air removed local suction, should be regarded as approximate. In each particular case is necessary to analyze requirements for granting a pollutant, suctioning design and its location and based on the analysis to take this or that performance of the local hoods. For suction panels plays an important role to size panels. Excessively large panel would require unreasonably large air flow, with insufficient size of the panel its action may be ineffective even at high speed in her living section as part of the hearth unhealthy to be too far from the local suction.