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This is used as a localised humidification unit, especially above the mixing bins where stack mixing is followed. This type of humidifier has a problem that dust in the air gets choked at the edges and the water gets accumulated and big drops start falling. Hence periodic cleaning with a hard brush fitted to a long bamboo stick is practiced. 10 Impeller humidifiers. 2 Water atomisation with compressed air Compressed air attains high velocity as it expands and this energy is utilised to atomise water.

The distributor can be mounted in the air conditioner, in duct work or with a special blower box for free discharge in the space. The piping for the distributor is specifically sized to match the humidifier’s capacity and must be located to avoid condensate blockage during operation. A steam canister humidifier must bring the water in the canister up to boiling temperature before it is at full capacity, a process that can take several minutes. It does this by passing an electrical current through the water between electrodes.

An important part to be noted is majority of the solids in the room are carried upward by the heat generated by the machines, only about 30–40% of the total fall out is captured by this system. However, by placing the supply air diffusers in the top and return air suctions in the bottom and maintaining the quantity of air extraction balancing with the air inflow can reduce the problem of the solids going up. In order to keep the shed, the upper part of the machines and floor lint free, a device usually described as ‘travelling cleaner’, move along several machines, periodically blowing solids away from those parts and vacuuming off another 25–30% of the total.

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