DriSteem Vaporstream Spezifikationen PDF herunterladen (Seite 63)

P a g e 5 8 • 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 5 9

H u m i d i f i c a t i o n s y s t e m c o m p o n e n t s

p l a c e m e n t

Determine humidifier placement

A humidification system generally consists of a vapor or steam

generator and a dispersion assembly. The proper placement of

these two components is crucial for successful system operation.

Usually, there is no single correct placement for a humidifier. Much

depends on system design and application. However, the following

paragraphs and dispersion assembly placement examples are

presented as guidelines for common situations.

First, check available absorption distance

Available absorption distance affects system choice. Dispersed

steam must be absorbed into the airflow before it comes in contact

with any duct elbows, fans, vanes, filters, or any object that can

cause condensation and dripping. Not all humidification systems

guarantee absorption within a short distance, so it is important to

be aware of the available absorption distance early in your design

process.

Placing a dispersion assembly in an AHU

(see Figure 59-1)

• Location A is the best choice. Installing

downstream of heating and cooling

coils provides laminar flow through

the dispersion unit; plus, the heated

air provides an environment for best

absorption. Use a multiple tube dispersion

unit to ensure complete absorption of

steam vapor before fan entry.

• Location B is the second-best choice.

However, in change-over periods, the

cooling coil will eliminate some moisture

for humidification.

• Location C is the third-best choice. Air

leaving a fan is usually very turbulent

and may cause vapor to not absorb at

the expected absorption distance. Allow

for more absorption distance if installing

downstream of a fan.

• Location D is the poorest choice. The

cooler air at this location requires an

increased absorption distance.

Outside air

Relief air

Preheat coil

Motorized

air dampers

Supply airow

Filters

Economizer

control device

Heating coil

Cooling coil

8' to 12' (2.4 m to 3.7 m)

Duct high limit humidity control

for dispersion locations A, B

Airow proving switch

Dispersion discharges against

airow

Airow proving

switch

Duct high limit humidity

control for dispersion location C

Return airow

8' to 12'

(2.4 m to 3.7 m)

3' to 5'

(1 m to 1.5 m)

Fan

Figure 59-1:

Placing a dispersion assembly in an AHU

ABD

Exterior

building wall

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