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SEMINAR - DEHUMIDIFICATION


Applications

Dehumidifiers have been traditionally viewed as equipment for "industrial" usage. However, in the recent times, dehumidifiers are being increasingly used for treating fresh air for Indoor Air Quality (IAQ) needs.


Thus, in this article, we will take a look at the uses of desiccant dehumidifiers for both "man and his machines".

Traditional Applications of Dehumidifiers

The uses of dry air are almost as limitless as the ingenuity of man. However, industrial applications can be categorised into 4 major areas …… Storage, Production & Processing, Packaging and Product Drying.



The Moisture menace
Although moisture is invisible, its damaging effect on almost everything around us is very evident. Rusting of metals, lumping and decomposition of chemicals, increased microbial activity leading to growth of mold, mildew and fungi on organic substances, warping, decay, deterioration, etc. are some of the common problems due to high humidity encountered in our daily life.

In most cases, controlling the relative humidity to below 35% helps to keep this moisture menace under check. The concept of dehumidification dates back to World War II when it was used by the Navy to mothball ships to maintain them in the 'as is' conditions. However, the advent of new technologies and new products has widened the scope of this field to extensive industrial applications with the result that many areas of high technology cannot function today without a controlled climate.



Emerging application of dehumidifier for treatment of fresh air
People prefer cool and dry air!

The impact of indoor humidity on people has been neglected for decades. Ventilation rates required to obtain a certain perceived air quality, have been also assumed to be independent of humidity. It has been generally accepted that pollutants from indoor air sources viz. from humans, tobacco smokes, VOCs etc, need to be diluted with outdoor air to a level perceived acceptable by the people. Thus, treating outdoor air for humidity control has not been the focus of designers. However, recent studies at various international forums have shown that perceived Indoor Air Quality (IAQ) is strongly influenced by both humidity and temperature of air we inhale! Increased awareness of IAQ and health consciousness has resulted in increased concern for methods used to treat fresh air.

Treating fresh air with rotary desiccant dehumidifiers to control humidity

Conventional treatment of air, where air is cooled, condenses the water, which tends to create health problems due to mould, mildew and bacteria formation.

Using a rotary desiccant dehumidifier to precondition air is preferred in service industry or similar areas where 100% fresh air is required to be treated.

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