The Importance of Distribution. Manifold Position And Vapor Trail

The Importance of Distribution

Manifold Position And Vapor Trail

Duct Air Temp And Vapor Trail

Air Flow Velocity And Vapor Trail

Humidification And Temperature Controls

Multiple Manifolds In Duct

Multiple Manifolds And Vapor Trail

Recommended Number and Spacing of Manifolds for Various Duct Heights

Duct Height at HumidifierLocation

No. of Manifolds to beInstalled From one or MoreHumidifiers

37” to 57”94 cm to 145 cm

2

59” to 80”150 cm to 205 cm

3

81” to 100”206 cm to 255 cm

4

101” and above256 cm and above

5

Design Guidelines:Boiler & Humidifier Combinations

• Boiler Gross Output Capacity Should be at Least 1.5 Times Total Humidification Load

• Water Softeners Should Be Used On Boiler Feed Water

• Condensate Return System Is Not Necessary (Unless Required by Circumstances)

Design Guidelines:Boiler & Humidifier Combinations

• Boiler Pressure Should Be 15 psig (1 bar) Or Less

• Automatic Blow-Down System Is Desirable

• Steam Supply Piping Should Be Insulated

• No Limit To Size Or Number Of Humidifiers From One Boiler

Steam Humidifier - Performance

• Vapor Quality Excellent– Steam Molecules are .0006 Microns– Humidifier Tests Indicate No Particles Less

Than 3 Microns

• Turn Down - Up To 123:1 For Single Humidifier

• Response Time - Excellent

Steam Humidifier - Costs

• Equipment

– 100 LB/hr (45 kg/hr) = $2,200

– 1000 LB/hr (450 kg/hr) = $5,500

• Installation

– Depends on Application

• Energy

– 100 LB/hr (45 kg/hr) = $0.50/hr

• Maintenance

– 1 Hour Per Unit Per Year

Steam Supply OptionsNo Volatile Chemical Treatment

• Do Not Return Condensate– Not Much Condensate With Humidification

• Stainless Steel Return Piping

• Replace Return Lines When Corroded

Dedicated Steam System

• Separate Boiler(s) For Direct Steam Humidifiers– Not Cost Effective At 100 LB/hr (45 kg/hr)– But Can be At 500 LB/hr (225 kg/hr) or More– Plus Benefits of Direct Steam Injection