Air Washer Units

Almonard has created a niche for itself in power plant ventilation for evaporative cooling due to highly qualified and experienced fan engineering team effports.

And Air washer is a set of equipments to provide an intimate contact between air and water for the purpose of obtaining transfer of either heat or moisture from one to the other or for removing impurities from the air or a combination of both.

These Airwashers come in panel construction and hence are easy to assemble at site.since theese units are galvanised they have a long life. Most of such units are custom built as per the exact requirement of the customer.

These units can either be supplied as 'push-thru' or 'draw thru' versions based on the location of fan.

Almonard airwashers are horizontal type and come with either spray type or cooling pads (i.e pvc/celldeck pads).

Spray Type Air Washer Unit:

Spray type consist of masonry chamber or a casing enclosing a system of water sprays, a tank for collecting the water falling from the spray, inlet distribution plate or louver and moisture separator at the air leaving end. Refer sketch.

Air is either pushed or draen through the air washer chamber to bring into contact with the water. A well designed air washer has the ability to produce reduction in the dry bulb temperature of air using re-circulated spray water. This lowering of db temperature does not change the total heat content of the air nor does it change the wet bulb temperature. When water is evaporated from the sprays, the latent heat of evaporation required to evaporate the water is being supplied from the sensible heat of the heat in the air. Thus the dry bulb temperature is lowered increasing the moisture content.

Cooling Pads (i.e PVC / CELL DEK ) type Air Washer unit:

In cooling pads type air washer unit the water is upplied through a pipe to a distribution pad on top. This ensures a uniform supply of the water to the cooling pad and minimizes the risk of dry spots. The water is then evaporated into the dry and warm air that passes through the pad. The heat that is needed for evaporation is taken from the air itself. The air that leaves the pad is therefore cooled and humidified simultaneously. The water that is not evaporated is drained back to the reservoir for re-recirculation through pump.

The cooling pad is manufactured by bonding together corrugated cellulose sheets or pvc sheets with different flute angle. The first one has a flute angle of 60 degrees and the second one has a flute angle of 30 degrees. This unique cross flow configuration creates an intense contact between air and water and provides exceptional evaporation. The result is a pad with cooling efficiency hard to surpass as well as a cooling proces that works in an economic and environmentally friendly way.

Special impregnation and treatment procedure for the cell dek cellulose material provids an efficient wetting of the large contact surface in the pad. The efficiency in cell dek pad is around 90%, where as in pvc pad is around 70%. due to above the cell dek absorb and disperse large quantities of water minimizes the risk of droplet carryover and keeps the humidification efficiency to a high level for long periods.