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: 40

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

Latest Activity

Chris Dorsi commented on Home Energy Magazine's blog post The Elephant in the Room
"This was a great session, witness the fact that we had to schedule a second showing to accommodate…"
10 hours ago
Chris Dorsi liked Home Energy Magazine's blog post The Elephant in the Room
10 hours ago
eric anderson added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Equipement still for sail (what is left from what I was selling before)

For some reason I can't reply to my previous thread.  I sold the blower door and duct blaster/flow…See More
17 hours ago
Mark Sackerson replied to angela stanzione's discussion Used Weatherization and auditing equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Angela, Do you have any blower door sets left? mark"
18 hours ago
Mark Sackerson replied to Jeffrey Anthony's discussion Blower Door Kits in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"Jeffrey, do you have any blower door kits left? mark msackerson@franzoso.com"
18 hours ago
Mark Sackerson joined allen p tanner's group
Thumbnail

Energy Auditing Equipment for Sale, Trade or to Purchase

Discuss the pros and cons of the equipment you are interested in prior to purchase. Post equipment…See More
18 hours ago
Profile IconMark Sackerson and Matt Ward joined Home Energy Pros
18 hours ago
Quinn Korzeniecki's discussion was featured

Join BPI's New Professional Website Focus Group

Want to be part of the elite group of individuals that views the new BPI professional website…See More
18 hours ago

Home Energy Pros

Welcome to Home Energy Pros – the unique digital community by and for those who work in the home energy performance arena.

Home Energy Pros was founded by the developers of Home Energy Saver Pro (supported by the U.S. Department of Energy) and brought to you in partnership with Home Energy magazine.  Home Energy Pros is sponsored by the Better Buildings Residential Network. Please honor our Guidelines

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service