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Nortec NHTC, NHPC manual 10-10, B. Determining The Steam Absorption Distance, Page 43

Models: NHPC NHTC

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(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:

(RHah - RHbh) Z = ––––––––––

(100 - RHbh)

RHah = Percentage of relative humidity after humidification. RHbh = Percentage of relative humidity before humidification.

Example 1:

•55°F (12.8°C)/ 12% RH - Conditions before humidification.

•20 000 CFM (33 980 m3/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:

RHbh = 12%

RHah = 61%

Z= (61 - 12) / (100 - 12) = 0.56

10-10

Page 43 2008-10-01

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Nortec NHTC, NHPC manual 10-10, B. Determining The Steam Absorption Distance, Page 43

Contents

2538144-B NH SeriesTMNHTC / NHPC ELECTRODE STEAM HUMIDIFIER Engineering ManualCOPYRIGHT NOTICE SPECIFICATION LABEL LOCATIONPROPRIETARY NOTICE LIABILITY NOTICESubject TABLE OF CONTENTS10-00ELECTRODE STEAM ENGINEERING 10-10HUMIDITY, STEAM ABSORPTION AND DISTRIBUTIONSubject 10-20SPECIFICATIONSWARRANTY 10-30SUBMITTALSFigure LIST OF FIGURES10-00ELECTRODE STEAM ENGINEERING 10-10HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION2008-10-01 10-30SUBMITTALSFigure Figure10-30SUBMITTALS LIST OF TABLES10-00ELECTRODE STEAM ENGINEERING 10-10HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION2008-10-01 Table 13. Modulating Demand Signal By Others Single Channel. . . . . . . . . . . . . . . . . . .10-00 INTRODUCTION 10-00Page 10-00 Figure 1. NHTCPage 2 1. INTRODUCTION 10-00Page 3 Page 4 10-00Page 5 10-00Figure 2. Optimum Boiling Time Figure 3. Conductivity1Water Type Used Potable or Softened B.NH CAPACITY ADJUSTMENT10-00 C.DRAIN CYCLE AND CYLINDER LIFE1.Fill to A trigger use all places below 10-00Page 8 Figure 5. Capacity Setting & Cylinder LifeFigure 6. Output vs Service Life 10-003.PRE-INSTALLATIONEQUIPMENT VERIFICATION 10-00A.GENERAL Figure 6. Typical NHRS Installation Sheet 1 of 10-00Page 10 Figure 7. Typical NHRS Installation Sheet 2 of 10-00Page 11 10-10 HUMIDITY STEAM ABSORPTION AND DISTRIBUTION 10-10Page 12 D.TEMPERATURE AND HUMIDITY AVAILABLE HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION1. HUMIDITY C.TEMPERATURE AND HUMIDITY REQUIREDPage 14 Outdoor temperature10-10 Table 2. Load Calculation Summary SheetE.INCOMING AIR VOLUME 10-10Page 15 JANUARY 10-10Table 4. Design Outdoor Conditions Page 16JANUARY 10-10Table 4. Design Outdoor Conditions cont Page 17JANUARY 10-10Table 4. Design Outdoor Conditions cont Page 18Page 19 10-10Page 20 10-10Page 21 10-1010-10 Table 6. Regain of Hygroscopic MaterialsPage 22 Page 23 10-10Page 24 10-10Page 25 10-10Product and/or Process Temperature10-10 Page 26Figure 2. Psychrometric Chart 10-10Page 27 Page 28 2.STEAM ABSORPTION AND DISTRIBUTION10-10 A.VARIABLES THAT AFFECT ABSORPTION DISTANCES10-10 Figure 3. Steam Distributor LocationPage Page 30 10-10B.CALCULATING THE DOWN STREAM HUMIDITY LEVEL 2The following are two examples: ExamplePage 31 10-10C.CONTROL OF DUCT OR PLENUM SATURATION Figure 4. Condensate Drain PanFigure 5. Proper Slope 3.STEAM RUNS AND CONDENSATE RETURNS10-10 A.STEAM RUNS10-10 Table 11. Steam Line MaterialPage 33 Unit Size 10-10B.CONDENSATE RETURN PageFigure 7. Steam Line Connection 10-10Figure 8. Condensate Tee At Any Low Point In Steam LinePage 36 10-10A.STEAM DISTRIBUTORS 4.STEAM DISTRIBUTORS ASD, BSD, CSDB.DISTRIBUTOR CHARACTERISTICS 10-10Page 38 10-10C.DISTRIBUTOR LOCATIONS AND MOUNTING D.MULTIPLE DISTRIBUTOR APPLICATIONSPage 39 10-10Figure 12. Cutting Duct For Mounting Figure 13. Humidification Distance NomogramDistributors in AHU 10-10F.DISTRIBUTOR ABSORPTION DISTANCE Figure 14. Best Location for Multiple SteamFigure 15. Roof Top Units 2-20Tons – H.DISTRIBUTOR DIMENSIONS10-10 G.TYPICAL APPLICATIONSFigure 17. SAM-eTubes 5.SHORT ABSORPTION MANIFOLD SAM-e10-10 A.GENERAL10-10 B. DETERMINING THE STEAM ABSORPTION DISTANCEPage 43 Table 15. Air Pressure Loss in AHU/Duct 10-10NOTES C.STATIC AIR PRESSUREFigure 21. Absorption Distance – 9 Centers 10-10Figure 19. Absorption Distance – 3 Centers Figure 20. Absorption Distance – 6 CentersCondensate Loss F.SAM-eDIMENSIONS10-10 TableFigure 25. Steam Inlet 10-10Figure 23. SAM-eHeader Figure 24. SAM-eTubesJ.MINI SAM-e I.SAM-eSTEAM INLET CONFIGURATION SELECTION10-10 1Atmospheric Steam NH, GS, SETable 20. Mini SAM-eTubes 10-10Table 18. Mini SAM-eHeaders – Table 19. Mini SAM-eHeaders –Page 50 10-10Figure 27. NH Series Humidifier With 6. BLOWER PACKS BOBP, RMBP10-10 ABOVE THE FLOOR A.BLOWER PACKSMinimum Number Of 10-10Page 52 NH Series ModelTHIS FUNCTION B.ON/OFF CONTROLS 7.CONTROLS10-10 A.GENERALE.TRANSDUCER SENSORS D.OUTDOOR TEMPERATURE SETBACKFigure 29. Set Point Versus Outdoor Temperature 10-10Page 55 10-10F.POSITIONING CONTROLS AND SENSORS G.NORTEC ONLINE10-10 Figure 30. NORTEC OnLine MonitoringPage 56 10-10 H. NORTEC LINKSPage 57 10-10 I.TYPICAL INSTALLATION LAYOUT FOR NHTC/NHPCJ.NORTEC CONTROLLER DIMENSIONS 1See dimensions in ChapterG FOR YOUR INFORMATION NORTEC ONLINE CONFIGURATION FORMFigure 31. NORTEC Online Configuration Form 10-10Figure 32. NORTEC Links Form NORTEC LINKS FORM10-10 Please complete the information belowPage 61 10-10Modulating Wall Mounted Space Controller Modulating Wall Mounted Space ControllerPage 62 10-1010-20 SPECIFICATIONS 10-20Page 63 10-20 SPECIFICATIONS1.HUMIDIFIERS 4WarrantyPage 65 10-2010-20 2Humidifier Controls NHTC and NHTC OutdoorPage Page 67 10-20Page 68 10-2010-20 4Humidifier Dispersion OptionsPage 69 10-20 C. EXECUTION 1ExaminationPage 70 3Commissioning 2Installation4Testing 10-20Page 72 10-2010-30 SUBMITTALS 10-30Page 73 B.NH UNIT 1. SUBMITTAL DESCRIPTIONS10-30 A.INTRODUCTIONPage 75 10-302Built-OnBlower Pack NHTC and NHPC only F. CONTROLSPage 76 10-3010-30 Figure 1. Low Voltage Control Terminal StripPage 77 Figure 2. Primary Line Voltage Wiring to Unit 10-30Page 10-30 Figure 3. Physical Data – NHTC/NHPCPage 79 10-30 Figure 4. Physical Data – NHTC/NHPCPage 80 10-30 Figure 5. Physical Data – NHTC/NHPCPage 81 Unit Model 10-30Minimum Duct Dimensions – in mm10-30 DistributorModel Dimensions – in mm10-30 DistributorD Tube Height 10-30Duct Width Duct HeightDuct Width 10-30Page 87 10-30Page 88 10-30Page 89 10-30Page 90 10-30Page 91 Figure 14. Vertical Duct Installation10-30 Figure 15. Outside Duct Mounting Cover PlatesFigure 16. Atmospheric SAM-eAdapter Dimensions 10-30Page 92 Page 93 10-30Page 94 10-30Page 95 10-30Page 96 10-3010-30 Wall Digital Humidistat Dimensions10-30 Duct Sensor DimensionsA.INTRODUCTION 10-302.SUBMITTALS B.INSTALLATION COMPONENT SELECTIONPage 100 Table 2. Common Accessories Universal10-30 Table 3. Steam DistributorsPage 101 Table 4. Steam Distributor Accessories10-30 Table 3. Steam Distributors contPage 102 Table 4. Steam Distributor Accessories contOther Accessories 10-3010-30 Table 5. SAM-eHeaderPage 103 10-30 Table 5. SAM-eHeader contPage 104 10-30 Table 5. SAM-eHeader contPage 105 Table 7. SAM-eTube Matrix Table 6. Adjustable Mounting Frame for SAM-e10-30 Table 5. SAM-eHeader cont10-30 Table 7. SAM-eTube Matrix contPage 107 10-30 Table 7. SAM-eTube Matrix contPage 108 10-30 Table 7. SAM-eTube Matrix contPage 109 Page 110 Table 8. SAM-eInlet and Adapter Configurations10-30 Table 7. SAM-eTube Matrix contPage 111 10-30Table 9. Remote Blower Pack Table 10. Built-OnBlower PackPage 112 10-30Table 11. Controls – ON/OFF Table 12. Modulating Control By NORTECPage 113 10-30Table 17. NORTEC Links Options NHTC only Table 18. NH Series Fusing Options10-30 Table 16. NORTEC OnLine Options NHTC onlyDistributor Information 10-30C. SCHEDULE Humidifier Information Control InformationWARRANTY Ogdensburg, NY Cylinder Replacement Date MM/DD/YYYY826 Proctor Avenue 2740 Fenton Road