DriSteem Vaporstream Specifikace stáhnout pdf (Strana 37)

P a g e 3 2 • D R I - S T E E M D e s i g n G u i d e

D R I - S T E E M D e s i g n G u i d e • P a g e 3 3

H u m i d i f i e r s a n d w a t e r t y p e

Water type affects humidifier performance, maintenance,

vapor quality, and efficiency

Water is often called the universal solvent because almost

everything is soluble to some degree in water. This property causes

water to become contaminated by virtually any material it contacts,

with the mix of contaminants varying greatly from one location to

another.

Humidification is the process of transforming water into vapor,

and so it is not surprising that water type has a great impact on

humidifier performance, maintenance requirements, humidification

vapor quality, and efficiency of operation.

There are four types of water used in humidifiers:

• Potable water (drinking, tap, or well water)

• Softened water (hardness reduced through an ion exchange

process)

• High-purity water (deionized and/or reverse osmosis treated

water)

• Boiler water (typically treated with anticorrosion chemicals)

Potable water: Usually safe for drinking

but can be hard on humidifiers

Potable water, commonly referred to as drinking, tap, or well

water, can contain any number of living microorganisms, dissolved

organic material, dissolved minerals, and suspended materials.

While all of these substances can affect humidification vapor

quality, humidifier maintenance, performance, and efficiency

are significantly affected by dissolved minerals and suspended

materials.

• Living microorganisms (bacteria) are killed when water is

heated to 180 °F (83 °C), and so bacteria are not a concern when

using isothermal humidifiers where water is boiled to make

steam (vapor). However, care should be taken to ensure that all

harmful microorganisms are removed from water sources feeding

nonboiling (adiabatic) humidifiers such as air washers, foggers,

atomizers, or pezio disk systems. In addition, even though a

water supply may be free of harmful bacteria, contaminants from

the air can still cause microbial growth in wetted-media or wick

systems. Water treatment for bacteria includes filtration, reverse

osmosis, chemical oxidation, and disinfection. The most common

treatment for bacteria is chemical oxidation by either ozonation

or by adding chlorine.

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