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Nortec NHPC, NHTC manual Steam Absorption And Distribution, 10-10, Page 28

Models: NHPC NHTC

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2.STEAM ABSORPTION AND DISTRIBUTION

A.VARIABLES THAT AFFECT ABSORPTION DISTANCES

(1)This manual will help in the design of a steam distribution system to provide the optimum performance from the humidifier and absorption of steam within the duct system.

(2)Experience has shown that absorption of steam is affected primarily by the psychrometric conditions of the air based on how much residual capacity at a given air volume and temperature exist to hold the moisture being introduced.

(3)To properly introduce steam into an air stream, five variables must be known:

(a)Temperature (°F or °C). If the air temperature varies, pick the lowest temperature.

(b)Highest humidity level before the distributor (%rh).

(c)The amount of moisture being added resulting in a change of rh in the duct or plenum (Δ %rh).

(d)Minimum velocity of the air (FPM).

(e)The size of the duct or plenum (cross section area).

(4)As a guide, Table 8 shows how each variable affects the absorption distance.

(5)Table 9 shows examples of typical absorption distances in air handling systems.

(6)Referring to Figure 3, ‘D’ can vary between 1 to 20 feet depending on the airflow’s:

(a)Velocity (V)

(b)Temperature (T)

(c)Humidity (H)

(7)When (V) is 500 fpm, (T) is high (90 to 130°F) and (H) is low (10% to 30% rh) the ‘D’ will be 1 to 2 feet. As the (H) goes up ‘D’ becomes longer. Similarly, as (T) goes down, ‘D’ goes up. High velocity also increases ‘D’ by moving the steam further down stream before it can mix. Multiple distributors will shorten the steam absorption distance.

Table 8. Variables That Affect Absorption Distances

	Variables	Effect On Absorption Distance
	Variables	(NOTE: ↑ Increase ↓ Decrease
		(NOTE: ↑ Increase ↓ Decrease
	Air Temperature ↑	↓
		↓

	Air Temperature ↓	↑
		↑

	Air Humidity ↑	↑
		↑

	Air Humidity ↓	↓
		↓

	Large Increase of RH	↑
		↑

	Small Increase of RH	↓
		↓

	High Air Velocity (1000 fpm or above)	↑
		↑

	Low air Velocity (between 100 and 500 fpm)	↓
		↓

	Small Duct or Plenum (short distributor)	↑
		↑

	Large Duct or Plenum (long distributor)	↓
		↓

10-10

Page 28 2008-10-01

Image 36

Nortec NHPC, NHTC manual Steam Absorption And Distribution, 10-10, A.Variables That Affect Absorption Distances, Page 28

Contents

NH SeriesTM NHTC / NHPC ELECTRODE STEAM HUMIDIFIEREngineering Manual 2538144-BSPECIFICATION LABEL LOCATION PROPRIETARY NOTICELIABILITY NOTICE COPYRIGHT NOTICETABLE OF CONTENTS 10-00ELECTRODE STEAM ENGINEERING10-10HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION Subject10-20SPECIFICATIONS WARRANTY10-30SUBMITTALS SubjectLIST OF FIGURES 10-00ELECTRODE STEAM ENGINEERING10-10HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION Figure10-30SUBMITTALS FigureFigure 2008-10-01LIST OF TABLES 10-00ELECTRODE STEAM ENGINEERING10-10HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION 10-30SUBMITTALSTable 13. Modulating Demand Signal By Others Single Channel. . . . . . . . . . . . . . . . . . . 2008-10-0110-00 INTRODUCTION 10-00Page 10-00 Figure 1. NHTCPage 2 1. INTRODUCTION 10-00Page 3 10-00 Page 410-00 Figure 2. Optimum Boiling TimeFigure 3. Conductivity Page 5B.NH CAPACITY ADJUSTMENT 10-00C.DRAIN CYCLE AND CYLINDER LIFE 1Water Type Used Potable or Softened10-00 1.Fill to A trigger use all places belowFigure 5. Capacity Setting & Cylinder Life Figure 6. Output vs Service Life10-00 Page 83.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 HUMIDITY, STEAM ABSORPTION AND DISTRIBUTION 1. HUMIDITYC.TEMPERATURE AND HUMIDITY REQUIRED D.TEMPERATURE AND HUMIDITY AVAILABLEOutdoor temperature 10-10Table 2. Load Calculation Summary Sheet Page 14E.INCOMING AIR VOLUME 10-10Page 15 10-10 Table 4. Design Outdoor ConditionsPage 16 JANUARY10-10 Table 4. Design Outdoor Conditions contPage 17 JANUARY10-10 Table 4. Design Outdoor Conditions contPage 18 JANUARY10-10 Page 1910-10 Page 2010-10 Page 2110-10 Table 6. Regain of Hygroscopic MaterialsPage 22 10-10 Page 2310-10 Page 2410-10 Page 25Temperature 10-10Page 26 Product and/or ProcessFigure 2. Psychrometric Chart 10-10Page 27 2.STEAM ABSORPTION AND DISTRIBUTION 10-10A.VARIABLES THAT AFFECT ABSORPTION DISTANCES Page 2810-10 Figure 3. Steam Distributor LocationPage 10-10 B.CALCULATING THE DOWN STREAM HUMIDITY LEVEL2The following are two examples: Example Page 3010-10 C.CONTROL OF DUCT OR PLENUM SATURATIONFigure 4. Condensate Drain Pan Page 313.STEAM RUNS AND CONDENSATE RETURNS 10-10A.STEAM RUNS Figure 5. Proper Slope10-10 Table 11. Steam Line MaterialPage 33 10-10 B.CONDENSATE RETURNPage Unit Size10-10 Figure 8. Condensate Tee At Any Low PointIn Steam Line Figure 7. Steam Line Connection10-10 Page 364.STEAM DISTRIBUTORS ASD, BSD, CSD B.DISTRIBUTOR CHARACTERISTICS10-10 A.STEAM DISTRIBUTORS10-10 C.DISTRIBUTOR LOCATIONS AND MOUNTINGD.MULTIPLE DISTRIBUTOR APPLICATIONS Page 3810-10 Figure 12. Cutting Duct For MountingFigure 13. Humidification Distance Nomogram Page 3910-10 F.DISTRIBUTOR ABSORPTION DISTANCEFigure 14. Best Location for Multiple Steam Distributors in AHUH.DISTRIBUTOR DIMENSIONS 10-10G.TYPICAL APPLICATIONS Figure 15. Roof Top Units 2-20Tons –5.SHORT ABSORPTION MANIFOLD SAM-e 10-10A.GENERAL Figure 17. SAM-eTubes10-10 B. DETERMINING THE STEAM ABSORPTION DISTANCEPage 43 10-10 NOTESC.STATIC AIR PRESSURE Table 15. Air Pressure Loss in AHU/Duct10-10 Figure 19. Absorption Distance – 3 CentersFigure 20. Absorption Distance – 6 Centers Figure 21. Absorption Distance – 9 CentersF.SAM-eDIMENSIONS 10-10Table Condensate Loss10-10 Figure 23. SAM-eHeaderFigure 24. SAM-eTubes Figure 25. Steam InletI.SAM-eSTEAM INLET CONFIGURATION SELECTION 10-101Atmospheric Steam NH, GS, SE J.MINI SAM-e10-10 Table 18. Mini SAM-eHeaders –Table 19. Mini SAM-eHeaders – Table 20. Mini SAM-eTubes10-10 Page 506. BLOWER PACKS BOBP, RMBP 10-10ABOVE THE FLOOR A.BLOWER PACKS Figure 27. NH Series Humidifier With10-10 Page 52NH Series Model Minimum Number Of7.CONTROLS 10-10A.GENERAL THIS FUNCTION B.ON/OFF CONTROLSD.OUTDOOR TEMPERATURE SETBACK Figure 29. Set Point Versus Outdoor Temperature10-10 E.TRANSDUCER SENSORS10-10 F.POSITIONING CONTROLS AND SENSORSG.NORTEC ONLINE Page 5510-10 Figure 30. NORTEC OnLine MonitoringPage 56 10-10 H. NORTEC LINKSPage 57 I.TYPICAL INSTALLATION LAYOUT FOR NHTC/NHPC J.NORTEC CONTROLLER DIMENSIONS1See dimensions in Chapter 10-10NORTEC ONLINE CONFIGURATION FORM Figure 31. NORTEC Online Configuration Form10-10 G FOR YOUR INFORMATIONNORTEC LINKS FORM 10-10Please complete the information below Figure 32. NORTEC Links Form10-10 Modulating Wall Mounted Space ControllerModulating Wall Mounted Space Controller Page 6110-10 Page 6210-20 SPECIFICATIONS 10-20Page 63 SPECIFICATIONS 1.HUMIDIFIERS4Warranty 10-2010-20 Page 6510-20 2Humidifier Controls NHTC and NHTC OutdoorPage 10-20 Page 6710-20 Page 6810-20 4Humidifier Dispersion OptionsPage 69 10-20 C. EXECUTION 1ExaminationPage 70 2Installation 4Testing10-20 3Commissioning10-20 Page 7210-30 SUBMITTALS 10-30Page 73 1. SUBMITTAL DESCRIPTIONS 10-30A.INTRODUCTION B.NH UNIT10-30 2Built-OnBlower Pack NHTC and NHPC onlyF. CONTROLS Page 7510-30 Page 7610-30 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 10-30 Unit ModelDimensions – in mm 10-30Distributor Minimum DuctDimensions – in mm 10-30Distributor Model10-30 Duct WidthDuct Height D Tube Height10-30 Duct Width10-30 Page 8710-30 Page 8810-30 Page 8910-30 Page 90Figure 14. Vertical Duct Installation 10-30Figure 15. Outside Duct Mounting Cover Plates Page 91Figure 16. Atmospheric SAM-eAdapter Dimensions 10-30Page 92 10-30 Page 9310-30 Page 9410-30 Page 9510-30 Page 96Wall Digital Humidistat Dimensions 10-30Duct Sensor Dimensions 10-3010-30 2.SUBMITTALSB.INSTALLATION COMPONENT SELECTION A.INTRODUCTIONTable 2. Common Accessories Universal 10-30Table 3. Steam Distributors Page 100Table 4. Steam Distributor Accessories 10-30Table 3. Steam Distributors cont Page 101Table 4. Steam Distributor Accessories cont Other Accessories10-30 Page 10210-30 Table 5. SAM-eHeaderPage 103 10-30 Table 5. SAM-eHeader contPage 104 10-30 Table 5. SAM-eHeader contPage 105 Table 6. Adjustable Mounting Frame for SAM-e 10-30Table 5. SAM-eHeader cont Table 7. SAM-eTube Matrix10-30 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 Table 8. SAM-eInlet and Adapter Configurations 10-30Table 7. SAM-eTube Matrix cont Page 11010-30 Table 9. Remote Blower PackTable 10. Built-OnBlower Pack Page 11110-30 Table 11. Controls – ON/OFFTable 12. Modulating Control By NORTEC Page 11210-30 Page 113Table 18. NH Series Fusing Options 10-30Table 16. NORTEC OnLine Options NHTC only Table 17. NORTEC Links Options NHTC only10-30 C. SCHEDULE Humidifier InformationControl Information Distributor InformationWARRANTY Cylinder Replacement Date MM/DD/YYYY 826 Proctor Avenue2740 Fenton Road Ogdensburg, NY