DriSteem Vaporstream Spezifikationen PDF herunterladen (Seite 41)

P a g e 3 6 • 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 7

semiconductor manufacturing). Hard water can be used in

isothermal humidifiers with the understanding that these systems

require regular inspection and cleaning and that RH performance

will fluctuate. But the easiest and most cost-effective way to reduce

maintenance requirements is to soften the fill water.

Direct injection of boiler steam affects indoor air quality

Boiler steam is often directly injected into the air through steam

dispersion units to provide humidification. Owners of existing

boiler systems have found this a cost-effective, energy efficient, and

easily controllable way to add humidity without adding additional

equipment to make steam. However, boiler water is typically treated

with anticorrosion chemicals that, when directly injected into

the air as steam, negatively impact indoor air quality. Concerned

owners wishing to make use of an existing boiler for humidification

should consider a closed loop system such as our STS Steam-to-

Steam system that provides chemical-free steam for humidification

by running boiler steam through a heat exchanger.

Humidification as pure as the fill water

In general, the quality of humidification vapor is only as good as

the humidifier tank’s fill water. High purity water (DI/RO) provides

the purest humidification. Humidification produced through an

isothermal process (boiling) is a bit more pure than humidification

produced through an adiabatic process (unheated water turned

into vapor by evaporation, pressure and/or compressed air).

Some adiabatic systems using potable or softened water leave a

fine dust on area surfaces, and wetted-media or wick systems may

contaminate humidification vapor. Process-critical environments,

such as surgical suites, clean rooms, semiconductor manufacturing,

or museums requiring artifact preservation, use high purity water to

ensure very clean humidification vapor. Potable hard and softened

water in isothermal systems typically provide humidification vapor

that is adequately clean for comfort applications such as office or

residential buildings.

Hard water reduces energy efficiency

How water type affects energy efficiency is closely related to how

water type affects performance. Simply stated, the harder the

water, the more water wasted down the drain to remove minerals

and, therefore, the more water that will need to be replaced and

reheated, resulting in increased energy costs.

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DriSteem Vaporstream Spezifikationen Seite 41