Page 2 of 2 FirstFirst 12
Results 14 to 20 of 20
  1. #14
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,266
    Updated graph on WI home. Raised the dehu setting and incorporating the dehu on/off along with basement %RH. Tring to get the a/c more involved with humidity control of the home. Regards TB
    Attached Images Attached Images  
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  2. #15
    Join Date
    Apr 2002
    Posts
    11,808
    Maybe just mark the time axis once a day like midnight or every couple hours on the hour

  3. #16
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,266
    Here is a comparison of natural infiltration with a 30" window cracked 1" compared to 50 cfm of fresh air via a ventilating dehu with the dehu "off". The next couple days have the dehu set down to 45%RH and fresh air on. The impact is clear on the mainfloor, low %RH. The basement was wet with 50 cfm of fresh air and dehu "off". The 50 cfm of fresh air changed the freshness of the home. Perfect conditions with fresh air on and 45% RH. This week providing 50 cfm of fresh air during occupancy. 4:00 PM to 6:00 AM. VS fan "on" with ac set-up to 80^F, 76^F at 4:00 PM, 75^F at 9:30 PM. Raising the %RH setting on the dehu to 53%RH in the basement. The a/c control always reads the %RH 5% less than any of the data loggers. More to follow. Regards TB
    Attached Images Attached Images  
    Last edited by teddy bear; 07-21-2008 at 07:07 PM. Reason: attaching graph
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  4. #17
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,266
    Trying to attach this graph to the previous post. Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  5. #18
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,266
    One more shot at the graph. Regards TB
    Attached Images Attached Images  
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  6. #19
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,266
    Increased the make-up air from 38 cfm to 58 cfm of fresh make-up from 4:00 pm to 6:00 am through the dehu. The dehu operates only during these hours. Cooling load is declining cycling more. VS fan "on" mode. Looking at changing to ""auto" during afternoon/evening hours. Also looking at delaying fresh air ventilation start or different timer cycle. Home air much better with mechanical fresh air as a opposed to natural ventilation through air leaks + 1" x 30" cracked window. Regards TB
    Attached Images Attached Images  
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  7. #20
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,266
    July 22-23 is cooler, drier weather. Very little cooling load. The end of this day, the outdoor dew point is close to the desired indoor dew point. The dehu is removing 2-3 lbs. of moisture per hour and indoor dew point is not dropping. This may indicate that much of the 2-3 lbs. per hour of moisture is the moisture load from the structure and occupants. We will know more with lower outdoor dew points this fall. Regards TB
    Attached Images Attached Images  
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event