TrueSTEAM Humidification Systems Module 2: TrueSTEAM Sizing and Selection.

TrueSTEAM™ Humidification Systems

Module 2: TrueSTEAM Sizing and Selection

Module 2: Selecting & Sizing

• Understanding Industry Standards & Guidelines for sizing

• Calculating a home's humidity load requirements

• Trade-offs of different humidifier types

Key LearningKey Learning Selecting the Right Humidifier for Every JobSelecting the Right Humidifier for Every Job

Sizing – Establishing a Baseline

• AHRI sets rating guidelines for humidifiers. (610 Guideline F)

• Definitions- Capacity rating = Maximum output in 24-hour period

- Load requirement = Minimum output required to achieve 35%RH with external variables considered.

• Traditionally, ratings advertised based on capacity

• A better approachBase humidifier selection on LOAD REQUIREMENT to minimize excessive runtime, operating costs, and dealer callbacks.

*Based on a tight home with people living in it.

Sizing – Refining the message

• Assume fixed value 35%RH and hours needed to achieve.• Segmented by area size, average daily run times.

• A bypass humidifier is rated at 12 GPD - Why not use this?- 12 GPD based on 120F air passing through it

- In a 2000 sq ft space, equals 13 hours of furnace run time

- Furnace runtime more $$$ than TrueSTEAM in this example.

Sizing – TrueSTEAM Recommendations• HM506: 500-1800 for <80% daily run (<20 hr)

• HM509: 1000-2300 for <80% daily run (<20 hr)

• HM512: 1500-3000 for <80% daily run (<20 hr)

• Within these home sizes, units should hit ideal humidity without running all day.

• Why do some of the numbers overlap?- Variables within home affect these average run rates.

Variables within the home that affect humidity

• Insulation- Tight, average or loose?

• Ceiling height- Higher ceilings = smaller ft2 coverable (larger total volume)

• Indoor temperature- Higher temps require higher RH% to achieve desired comfort

• Control settings• Ventilation – What sources of ventilation are there?

- Fireplace flues

- ERV/HRV/motorized dampers

- Open windows

- Old homes breathe more

Insulation – AHRI definition of structure type

• 'Tight' = Well insulated with vapor retarders, tight storm doors, windows with weather stripping, dampered fireplace and using 1/2 air changes per hour for ventilation.

• 'Average' = Insulated with vapor retarders, loose storm doors and windows, dampered fireplace with 1 air change per hour for ventilation.

• 'Loose' = Generally built before 1930 with little or no insulation, no storm doors, no insulated windows, no weather stripping, no vapor retarders, undampered fireplace. Uses 1-1/2 air changes per hour for ventilation.

• How does this translate to load requirements?How does this translate to load requirements?

Square footage

Ceiling height

• AHRI sets load requirements for a fixed 8-ft ceiling height

• Higher ceilings, open foyers, split level, stairway air shafts add to total CUBIC feet- Higher height = Lower width/length served (i.e. lower ft2)

• If ceiling height >8ft, refer to ft3, not ft2.- Multiplying ft2 by ceiling height equals ft3

• How does this translate to load requirements?How does this translate to load requirements?

1000 ft 2 @8-ft

ceiling

1250 ft 2 @8-ft

ceiling

1500 ft 2 @8-ft

ceiling

2000 ft 2 @8-ft

ceiling

2500 ft 2 @8-ft

ceiling

3000 ft 2 @8-ft

ceiling

Frost Protection

• Auto-humidity controls reduce and increase indoor humidity based on outdoor conditions.

• What Honeywell Frost Protect reads…What Honeywell Frost Protect reads…

Frost setting limits achievable humidity.

Ventilation

• Ventilation sources- Fireplaces

If fireplace present, ensure flue is kept shut when not in use

- Forced air ventilators HRVs and motorized dampers exhaust humidity

- Open windows Drier outside air infiltrates home, exhausts humidified air

- Old homes breathe more Pre-1985 buildings can be assumed to be ‘Average’ or ‘Loose’ insulation,

unless retrofitted after.

• How does this translate to load requirements?How does this translate to load requirements?

1000 ft 2 @8-ft ceiling

1250 ft 2 @8-ft ceiling

1500 ft 2 @8-ft ceiling

2000 ft 2 @8-ft ceiling

2500 ft 2 @8-ft ceiling

3000 ft 2 @8-ft ceiling

Recommendations on Humidity with Ventilation

•Educate homeowner on proper fireplace upkeep.

•Ventilators – Recommend Energy Recovery style which retain moisture in home.

•Shut and lock windows.

• If average or loose fitting, upsize humidifier, or install multiple units if greater than 12 GPD is required.

Support Materials• Detailed Training Materials on Sizing Available!

• Visit www.forwardthinking.honeywell.com- Click on Humidification

• Enter literature form:

#50-1098: Proper Sizing

#50-1066:Selecting a Humidifier

Recap

• Understanding Industry Standards & Guidelines for sizing

• Calculating a home's humidity load requirements

• Trade-offs of different humidifier types

Key LearningKey Learning Selecting the Right Humidifier for Every JobSelecting the Right Humidifier for Every Job