Hi again,

    This is a great place to learn, thank you all that have answered my questions. Here is the next one. I just completed an audit and they only have a heater that is ducted because they are in a beach community. It was very leaky, but leaky compared to what??? I have read through my BPI and can't find some kind of multiplier for heater duct leakage

Judi

Views: 36

Replies to This Discussion

Duct leakage is leakage. I always apply the 6 cfm per 100 sqft energy star leakage standard for the ducts that I work with. The main difference in heating and cooling is in expected air flow of the two system types which vary.

21.7 times the OUTPUT btu= cfm for heat  Example: 100,000 btu furnace input   80,000 btu furnace output. 80% efficient.

21.7 X 80=1736 cfm supply for heat. You have to go outside BPI for these formula's. Try national comfort institute. The 80 comes from dropping the zero's  from 80,000 btu

thank you both, ahhh I forgot my HERS stuff. Yes, when I saw 21.7 I remembered HERS. See somtimes a little nudge is all we need. I guess I couldn't think of putting HERS and BPI together. Thanks much appreciated.

Judi

RSS

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Tom White's video was featured

Robby Schwarz on Builder Collaboration

Hear Robby Schwarz, of EnergyLogic discuss the value Owens Corning brings to Thrive Home Builders.
2 hours ago
Profile IconLights N More, John Kamas and Chuck Santeler joined Home Energy Pros
3 hours ago
Crosbey Archery liked Don Hynek's discussion Testing "Magic Pak" units??
4 hours ago
Crosbey Archery joined Norm Bourassa's group
Thumbnail

Multifamily Buildings

For too long there has been relatively little EE focus on multifamily, but some new programs have…See More
4 hours ago
Crosbey Archery liked Crosbey Archery's blog post Energy Tips - Fresh Look at Heating and Cooling the Home
4 hours ago
tedkidd liked Luis Hernandez's discussion Airsealing an old basement ceiling
11 hours ago
Ryan T De La Rosa posted a blog post

The Clean Power Plan and What You Can Do

Last month, Jessica Hardcastle at Environment Leader described an especially non-polarizing…See More
13 hours ago
Ed Minch replied to Luis Hernandez's discussion Airsealing an old basement ceiling
"Luis Think of it as a part of the house that is not being used, but part of the house none the…"
17 hours ago

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service