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2008-10-01
determine the number of steam distributors that must be use for short saturation
distances.
(2) If the ‘Saturation Distance’ for one steam distributor is not sufficient, add more steam
distributors until the minimum saturation distance is attained. (See Figure 13.)
(3) To determine the number of distributors required, complete the following list:
(a) Air humidity after humidification _____ %rh. (A high limit humidistat should be set
at 80 – 85% to prevent wetting of ducts.)
(b) Air temperature before humidification _____.
(c) Air velocity in duct _____ ft/min.
(d) Maximum steam mass flow _____ lbs/hr.
(e) Active zone H of steam distributor _____ in. (See Figure 13.)
NOTE
The manufacturer recommends the appropriate distance modification factors when
filters or humidification sensors are installed downstream. For applications that are
outside of the Nomogram’s range, please consult a NORTEC representative.
G. TYPICAL APPLICATIONS
(1) Representations of typical applications are found in Figure 15 and Figure 16.
H. DISTRIBUTOR DIMENSIONS
(1) Distributor dimensions for the various distributor models can be found in
Chapter 10-30.
Figure 16. Small Units On Residential
Furnaces
Figure 15. Roof Top Units 2-20 Tons –
Typical Location