The 10 Steps of Humidification Design

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1 The 10 Steps of Humidification Design

2 Why Humidify? Winter Outdoor Air 10F/60%RH = 6 grains Final Space 70F 6 grains = 4% RH

3 Why Humidify? ASHRAE Mechanical Systems

4 Why Humidify?

5 Why Humidify? Potential Change

6 Step 1: Select Humidifier Type

7 Two Humidifier Types Isothermal energy for change of state from boiler Adiabatic energy for change of state from air stream

8 Isothermal Steam from low pressure boiler Electric Resistant Electrode Gas Heat Exchanger Steam Heat Exchanger

9 Steam Jacketed Humidifiers

10 Non-Jacketed Short Absorption

11 Electric Resistant Heater

12

13 Electrode Type Humidifier

14

15 Steam Heat Exchanger

16 GTS Gas Humidifier

17 Gas Humidifier Energy Savings 12 Cents per kwhr

18

19 Adiabatic High Pressure Pump Compressed Air + Pump Piezo Disk Ultrasonic Wetted Media

20 High Pressure Pump

21 Adiabatic Significant temperature drop Longer absorption distance RO water required

22 43F/90% Discharge Air 70F/40% Final Space 10F/60% OA heated to 55F/10%

23 Step 2: Determine Humidification Load

24 Step 2: Determine Humidification Load Mechanical with constant amount of outside air Economizer changes amount of outside air to utilize free cooling

25 Mechanical Calculation

26

27 Economizer Calculation

28 Economizer

29

30

31 Step 2: Determine Humidification Load Accurate humidification load must include condensate loss and steam jacket requirement

32 Steam Jacket Impact on Load Calculation

33 Dispersion Panel Condensate Impact on Load Calculation

34

35 Step 3: Determine Absorption Requirement

36 Steam Absorption in Duct

37 Steam Absorption in AHU

38 Determine Absorption Requirement Temperature Velocity Fan/Air flow characteristics

39 Determine Absorption Requirement Effect of AHU or duct temperature on steam absorption distance

40

41

42

43 Determine Absorption Requirement Isothermal fpm Adiabatic fpm

44 Bypass Under Dispersion Panel

45

46

47 Suggested Schedule Format

48 Step 4: Chemically Treated Steam

49

50 Step 3: Determine if Chemically Treated Steam is Acceptable? Steam boilers with condensate return must protect piping with dangerous chemicals Sodium Sulfite, Sodium Hydroxide, Sodium Gluconate Chemicals in steam used for humidification will enter AHU air stream Scrutinize use in hospitals or museums

51

52

53 VA Standard

54

55

56 Steam Heat Exchanger

57 Caution: Limit One Per AHU DM-6814

58 Step 5: Condensate Management

59 Non-Jacketed Rapid Absorption

60

61 Step 4: Condensate Management Reduce atmospheric condensate

62 Insulated Tubes

63

64 Various Methods To Reduce Condensate and Heat Gain

65 Performance Differences

66 Condensate Management No atmospheric condensate-return to LPR

67 Steam Injection Humidifiers

68

69 End View Cut-Away

70 Step 6: Define Control Requirement

71 Step 6: Define Humidifier Accuracy Based on air changes per hour and RH accuracy requirement Standard humidifier will maintain +/- 3% with 2-10 air changes per hour

72 Humidifier Accuracy +/- 1% accuracy with high number of air changes is possible with: Pressurized steam controlled by steam valve with adequate turndown Resistive electric humidifier with DI/RO water and SSR controller- NOT ELECTRODE TYPE

73 Define Humidifier Accuracy DI/RO makeup water Eliminates interruption of boiling due to large amount of cold make up water Eliminates unscheduled maintenance or unit failure due to Calcium and Magnesium accumulation

74 Step 7: Make Up Water

75 Determine Water Source Will there be maintenance

76 Impact of Make Up Water

77 Impact of Make Up Water

78 Determine Water Source Anti-Foaming Ionic beds Softened water Skimmer + periodic drain

79 Ionic Bed Maintenance

80 Determine Water Source Softened water for cylinder life

81

82 Determine Water Source DI makeup water system must be properly maintained by end user or system will generate Chlorides

83

84 Step 8: Control System Consideration

85 Step 8: Control System Consideration Sensor placement VAV Primary/secondary Heat Gain from Humidifier Dispersion PID Loop/Modulating Duct High Limit Window dew point control

86 Sensor Placement Return Air for space monitoring Caution with high temp supply duct

87 Variable Air Volume Impacts ability to deliver humidified air at terminal unit Impacts ability to introduce moisture in AHU air stream

88 Variable Air Volume

89 Primary and Secondary/Trim System Often hospitals with diverse zones served by single AHU

90 Primary and Secondary/Trim

91 Primary and Secondary/Trim Interlock secondary trim humidifiers with reheat coils

92 Heat Gain from Dispersion

93 Step 9: Humidifier Tank Location

94 Step 9: Determine Humidifier Placement Access for maintenance Floor vs. Ceiling

95 Maximum100 ft. with proper steam supply sizing DM-6814

96 Consider condensate from tank & dispersion DM-6814

97 Step 10: Review Building Construction

98 Step 10: Review Building Construction Vapor barrier Windows Roof decking Dock doors

99 Vapor Barrier

100 Thank You

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