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Extra resources for Ashrae Pocket Guide for Air Conditioning, Heating, Ventilation, Refrigeration: Inch-Pound Edition

Example text

Also, an extended media-fill material can be used to increase the surface area of water in contact with the supply air stream. A downstream mist eliminator may be needed depending on Air handling units in textile industry 43 the face velocity of air through the unit as well as the characteristics of the water spray droplets. Water sprays in an air washer configuration have the ability to filter air with an efficiency of 95% for particles larger than 5 microns. Although many micro-organisms are much smaller (around 1 micron), most microorganisms tend to agglomerate to form ‘macro particles’ with aggregate sizes greater than their mono-disperse sizes.

It merely requires sequencing the dampers. Filters or strainers are installed in the supply air line to prevent unwanted materials like leaf bits, fibres and dust particles coming along with air, which might spoil the equipment and chock the air path. Normally, nylon or polypropylene mesh is used in case of re-circulation of air, and wire mesh is used for out side air inlets. The size of mesh shall depend on the place of their installation. The mesh used for fresh air is made with sturdy metal wires, and the openings are also bigger with areas of over 1 square inch.

3 39 The nozzle-free, horizontal airflow fogger Nozzle free horizontal airflow foggers have unique design that simplifies principal moving parts to one motor and its integral fan. Water or other fluids are fed into the specialised hub of fan blade assembly where it is subdivided and channelled into passage ways running the length of each blade. As liquid exits, it is atomised into ultra-fine fog particles. Aquafog is an example of this type of units. Unlike other fogging systems which may require permanent plumbing installation, high pressure pumps, complicated filtration, and constant maintenance of clogged nozzles, Aquafog’s streamlined one motor/one blade design produces and disperses fog using a single nozzle-free blade assembly.

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