(6) Absorption Distances:

3" centers = 7" (18 cm) 6" centers = 9" (23 cm) 9" centers = 12" (31 cm) 12" centers = 18" (46 cm)

(7)Reference Figures 19, 20, 21 and 22 to determine the center-to-center spacing required.

NOTES

1.The absorption distance data is based on 55°F (13°C) minimum temperature before humidification.

2.Data is based on velocities between 200 fpm (101 cm/s) and 2500 fpm (1270 cm/s).

3.Absorption distance: This is the distance between the SAM-e and the first obstruction (coil, elbow, damper, etc.) and the first obstruction steam may hit. Traces of steam may pass this obstruction, but will not condense, leaving obstructions dry.

4.If any of the duct AHU conditions are changed, the absorption distance may change due to increase or decrease in duct temperatures, amount of fresh air, various outside conditions, set point requirements, etc. If this occurs, re-calculate the absorption distance, and determine if the SAM-e needs to be modified or relocated.

C.STATIC AIR PRESSURE

(1)Table 15 shows the static pressure loss created by a SAM-e in various velocities.

Table 15. Air Pressure Loss in AHU/Duct

Air Velocity fpm

 

Air Pressure Loss (inches of water column)

 

 

 

 

 

 

SAM-e Tube Spacing

 

(cm/s)

 

 

 

 

 

 

 

 

3" (7.6 cm)

6" (15.2 cm)

9" (22.7 cm)

12" (30.5 cm)

 

 

 

 

 

 

500

(255)

0.01 (0.02)

0.01 (0.02)

No measurable data

 

 

 

 

 

 

750

(383)

0.03 (0.08)

0.01 (0.02)

 

 

 

 

 

 

 

1000 (510)

0.05 (0.013)

0.02 (0.05)

 

 

 

 

 

 

 

1250 (638)

0.07 (0.18)

0.03 (0.08)

 

 

 

 

 

 

 

1500 (765)

0.09 (0.23)

0.04 (0.10)

0.01

0.01

 

 

 

 

 

1750 (893)

0.10 (0.25)

0.06 (0.15)

0.01

0.01

 

 

 

 

 

 

2000

(1020)

0.12 (0.30)

0.08 (0.20)

0.01

0.01

 

 

 

 

 

 

D.CONDENSATE LOSSES

(1)The SAM-e will condense some of the steam generated by the NORTEC humidifiers. To compensate for this loss in capacity, we must increase the calculated humidification load accordingly. Refer to Table 16.

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Page 44 2008-10-01

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Nortec NHPC, NHTC manual Static AIR Pressure, Air Pressure Loss in AHU/Duct, Condensate Losses, 6 cm

NHPC, NHTC specifications

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