Armstrong’s improvements in steam humidification are basic. They start with the steam, not the humidifier. What’ve we learned from conditioning steam has guided us in the improvements we’ve made to the hardware (humidifiers) we use to disperse steam humidification.
The most common form of steam humidifier is the direct-steam-injection type. Direct-steam humidification systems require very little maintenance. The steam supply acts as a cleaning agent to keep components free of mineral deposits that can clog many forms of water-spray and evaporative-pan systems.
Response to control and accurate control of output are two other advantages of direct-steam humidification. Since steam is water vapor, it needs only to be mixed with air to satisfy the demands of the system. In addition, direct-steam humidifiers can meter output by means of a modulating control valve. As the system responds to control, it can position the valve anywhere from closed to fully open. As a result, direct-steam humidifiers can respond more quickly and precisely than other humidifier types to fluctuating demand.
The high temperatures inherent in steam humidification make it virtually a sterile medium. Boiler makeup water is assumed to be of satisfactory quality. So if there is no condensation, and if no dripping or spitting occurs in the ducts, the system will not disseminate bacteria.
Corrosion is rarely a concern with a properly installed steam system. Scale and sediment—whether formed in the unit or entrained in the supply steam—are drained from the humidifier through the steam trap.
Conditioned steam. It’s the cornerstone of Series 9000 superior performance and control.
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