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Page 43
2008-10-01
(5) The features of the short absorption manifold are:
(a) Inlets/Outlets located on same side, one access point required.
(b) All stainless steel distributors and nozzles ensure permanent bond.
(c) Stainless steel header with rubber grommet seals for easy installation of
distribution tubes.
(d) Adjustable mounting frame available for quick and easy installation.
(e) Available with 3", 6", 9", or 12" center-to-center distributor spacing.
(f) Atmospheric steam source.
(g) Two year limited warranty.
B. DETERMINING THE STEAM ABSORPTION DISTANCE
NOTE
Visit www.humidity.com to download our Humidification Engineering & Loadsizing
Program (H.E.L.P.) to help you calculate the absorption distance.
(1) Injecting steam into the air requires a certain amount of time before the steam is
absorbed completely.
(2) In a moving air stream, this time results in the steam moving a fixed distance from the
manifold before it is fully absorbed.
(3) Knowing the absorption distance will ensure that steam will not condense on any
critical components following the steam distribution area.
(4) The system should be designed to eliminate the possibility of wetting internal
components by positioning the manifold in the optimum location and by keeping the
absorption distance to a minimum.
(5) The absorption distance can be calculated using the Z ratio. The Z ratio and the
following method may be used as a guide to calculate the absorption in various air
handlers, and ducts with different conditions. It can be calculated as follows:
(RH
ah
- RH
bh
)
Z = ––––––––––
(100 - RH
bh
)
RH
ah
= Percentage of relative humidity after humidification.
RH
bh
= Percentage of relative humidity before humidification.
Example 1:
• 55°F (12.8°C)/ 12% RH - Conditions before humidification.
• 20 000 CFM (33 980 m
3
/h)
• 400 lbs/hr (181 kg/hr) load
Using the H.E.L.P. Software or a psychrometric chart you can find that the
humidity conditions after adding 400 lbs/hr (181 kg/h) of steam, are 55°F (12.8°C)
61% rh.
Thus giving:
RH
bh
= 12%
RH
ah
= 61%
Z= (61 - 12) / (100 - 12) = 0.56