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Sources of Humidity People and their activities – account for 25 lbs of moisture a day New building materials Weather / Environment Ventilation – Natural infiltration – Mechanical ventilation Other sources – Crawlspaces and basements. – Cleaned carpets, pools and spas
Controlling Humidity…Why? For Your Familys Health For Your Familys Comfort For Your Homes Sustainability
Health Ohio State University says, High humidity levels in the home contribute to the growth of allergy causing mold, bacteria and dust mites
According to a 2007 EPA study: Public health and economic impact of dampness and mold Attributed to an estimated 4.6 million cases of asthma Attributed to annual cost of asthma estimated to be $3.5 Billion. Health
ASHRAE Comfort Window
Building Science Corporation People are most comfortable when relative humidity range is between 25 – 60%. Recommends dehumidification separate from cooling in hot, humid climates Comfort
Reducing Humidity means Reducing… Stuffy / Clammy Feeling Musty Basements Condensation on Vents and Inside Windows Mold Growth Opportunity Sleepless Nights Overcooling to attempt to get comfortable
Controlling Humidity What factors do I need to take into account? How then do I optimally control humidity? Where can I find value-added benefits? …First, we need to understand the situation at hand…
Understanding the Situation What type of home construction? – Icynene / Foam Seal – Tight Home – Radiant / Moisture Barriers – Moisture in Materials What type of equipment is present? – HVAC sizing/type – Ventilation / Bathroom Fans – Gas Appliances / Direct Vented – Dishwasher – Washer / Dryer
Understanding the Situation How many occupants in the home? – During the day – During the night What type of activities? – Cooking Day/Night – Washing Day/Night – Etc
Understanding the Situation Are there times during the year where the temperature is between 60F and 75F and the humidity level is high enough to be uncomfortable and/or affect my indoor air quality negatively?
Understanding the Situation Are there times during the day where the temperature is between 60F and 75F and the humidity level is high enough to be uncomfortable and/or affect my indoor air quality negatively? Evenings? Mornings?
Important Questions…Why? Efficient home construction – Energy Star – Seal up the home keeping in the cooling/heating – Most efficient heating & cooling equipment today – Sustainability right? Concern the indoor air quality is worse indoors than it is outdoors – How do we handle the moisture and other pollutants that are trapped inside? – What direction do we go?
Important Questions…Why? Variable-speed central air conditioners do a good job of air conditioning while they are running – What about the times during the year where we dont need to cool but the humidity indoors is high? – Do we typically overcool? – Peak-sized A.C. / Partial-Load Conditions – Advanced humidity controls help, but less efficient system
Important Questions…Why? Using a ventilation strategy helps… – If no fresh air ventilation is used, what typically happens when the bathroom fans / direct-exhaust operate? Not enough make-up air available Negative pressurization Back-drafting can occur – If there is fresh air ventilation, what is done to treat the air in humid climates or conditions?
Important Questions…Why? Ventilation per ASHRAE …B2.1 – High-volume fans such as the air handler and some cooking exhaust fans can cause high levels of depressurization, particularly in homes of tight construction. – Depressurization of the living space relative to outdoors may cause back-drafting of combustion appliances and the migration of contaminants…into the living space. Depressurization can also result in moisture intrusion into building cavities in hot, humid climates, potentially causing structural damage and fungal growth.
Important Questions…Why? Ventilation per ASHRAE …B3.3 – Residences with high-performance glazing systems and thermally efficient roof and wall assemblies can have sensible loads sufficiently low so that traditional air-conditioning systems can have trouble providing humidity control. Under partial load conditions, the required outdoor air and occupant activities will often produce a larger latent load that can be handled by the air-conditioning systems. Under such circumstances, independent dehumidification control should be used.
Central Dehumidifiers The Optimal Solution… + Central Air Conditioning
Central Dehumidifiers Model 1750 – 90 pints per day Model 1770 – 150 pints per day The Optimal Solution…
Key Feature / Benefits 5 Year bumper-to-bumper Warranty Extreme Durability & Reliability – Highly Accelerated Life Testing 15+ year life expectancy for system Vibration Frequencies G-Force up to 60g – Coastal Environment Testing Board location & coatings Corrosion Performance
Key Feature / Benefits Automatic Control & Monitoring – Automatic air sampling to monitor moisture in the home, looks at Dew Point conditions – Can turn on HVAC blower in conjunction (Recommended) LED Status – simple diagnostics Air Cycling – can operate the HVAC blower for air cycling & air filtration if needed Ventilation Capabilities – operate damper and the HVAC blower for bringing in outside fresh air Living Space Control – option to remotely monitor and adjust comfort level within the home
SpecificationsAprilaire Model 1750Aprilaire Model 1770 Capacity3.91 lbs/hr (90 80°F & 60% RH6.51 lbs/hr 80°F & 60% RH Voltage120/1/60 Amp Draw8 amps14 amps Air Flow275 E.S.P500 E.S.P (EST) Filter1" Washable, Merv 8 ControlsBuilt-In Automatic Control or Space Control Cabinet Insulation1" Foil Paced Expanded Polystyrene Inlet Temperature Range40°F - 105°F Inlet Humidity Range30% RH - 100% RH Ambient Operating Temperature Range40°F - 150°F Ambient Operating Humidity Range0% RH - 100% RH Discharge Air 80°F and 60% RH Discharge Air Relative Humidity25% 80°F and 60% RH Refrigerant TypeR-22 Sound Level48 dBA Ducted; 54 dBA Non-Ducted53 dBA Ducted; 67 dBA Non-Ducted Weight92 lbs.100 lbs Dehumidifier Product Specifications
Aprilaire vs. Portables Leading Portables At least 2X the capacity TXV design High Performance Professional-Grade
Aprilaire vs. Portables Leading Portables More Efficient Energy Savings
Aprilaire vs. Portables Super Quiet (48dB / 54dB) No Drain Trays to Empty Application & Installation Flexibility – Ducted & Non-Ducted – Living Space Duct Kit – Condensate Pump Option
Key Highlights to Remember Reliability & Durability Performance / Professional-Grade Automatic Dew Point Control LED Status Application & Installation Flexibility
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