HUMIDITY CONTROL
REFRIGERANTS
Depending on the mineral content of the water, these
drain cycles may be considerably decreased or even abolished when using pure water. When being fed pure, or reverse osmosis water, the regular drain cycle turned off and the feed water can be changed to a trickle-feed setting. This means the boiling point is never lost within the boiling chamber and ensures even closer control, as well as lowering the strain on internal components and maintenance requirements. Dependant on the control of the temperature into which the humidity is being added and the sensitivity of the controlling sensor the humidifi er is able to achieve +/- 1% relative humidity when applications demand this level of control.
Distribution of steam
In both types of units, steam is introduced into the Air Handling Units (AHU) or duct by stainless steel steam lances, sized to ensure good evaporation of steam into the airfl ow. For those retrofi t applications where space is tight, or where the AHU section needs to be kept to a minimum, a multi-steam steam distribution manifold can be used to ensure the shortest evaporation distance is achieved - with these systems, it is possible to evaporate 100kg/hr of steam in less than 300mm. Neptronic’s Multi-Steam dispersion system is a high-
effi ciency steam distributor that ensures wasted energy is reduced by up to 85%. This is achieved by reducing condensate in the steam lances. Condensate is generated by the steam hitting a cooler surface creating condensate water which in many situations is sent to drain. This water had been heated to 100C so to allow it to be sent to drain wastes energy. The multi lances ensure that these losses are kept to a minimum creating the saving over more standard installations.
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For those in-room applications such as digital print rooms or small test labs, a specifi cally designed fan head can be installed on top of the humidifi er, or remotely, to disperse the steam directly into the space. Both steam technologies can use these methods of steam dispersion.
Which should I choose?
Selection should be based on the application requirements, for example: Is it a comfort application or a manufacturing process requiring 24 hours control? Is close control required or a nice to have? Is treated water available? Is capital cost or on-going running costs the primary concern? All these factors and more are considered when selecting the correct technology to use in each specifi c application, and in many cases, steam humidifi ers are indeed the right choice and the best- engineered solution for a project. As a rule of thumb electrode boilers are perfect for comfort and general air conditioning applications whereas the resistive technology is suited to laboratory or cleanroom applications. As always, it is best to consult humidity control specialists to determine the best solution for each unique application.
At Humidity Solutions, we stock electrode boilers and resistive humidifi ers from market leaders in the industry. Our electrode boiler humidifi ers are manufactured in the UK by Vapac, off ering some of the quickest lead times in the industry. Our resistive humidifi ers are supplied by Neptronic, based in Montreal, Canada.
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