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: 28

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

Home Energy Pros

Home Energy Pros was founded by the developers of Home Energy Saver Pro (sponsored by the U.S. Department of Energy,) and brought to you in partnership with Home Energy magazine.

Latest Activity

Bud Poll replied to richard gaughan's discussion Advice for heating a 3-story Vermont home built in 1900?
"To add to Richards list of what might have"
1 hour ago
Hal Skinner replied to richard gaughan's discussion Advice for heating a 3-story Vermont home built in 1900?
"Hi Richard. If we are talking a circa 1900 home, is there any insulation in the walls at all? …"
2 hours ago
David Meiland replied to richard gaughan's discussion Advice for heating a 3-story Vermont home built in 1900?
"Bud is right on. Get a professional auditor to assess the building. Finding the right person may…"
3 hours ago
Bud Poll replied to richard gaughan's discussion Advice for heating a 3-story Vermont home built in 1900?
"Hi Richard, Being a science writer and this being rental units, here is a moral dilemma you…"
7 hours ago
richard gaughan posted a discussion

Advice for heating a 3-story Vermont home built in 1900?

I'm a science writer, as opposed to an energy professional, and I joined this group to try to keep…See More
10 hours ago
Christopher Talarico posted a discussion

Heating with Tankless Water Heater & Hydronic Air Handler vs. Gas Furnace

Hi,I've looked around online and haven't found a lot of good information on home heating with…See More
21 hours ago
Profile IconSara Sabol, Christopher Talarico and Aaren Stewart joined Home Energy Pros
23 hours ago
Hal Skinner replied to Andy Gostisha's discussion Disguising Ductless Heat Pump Units
"Hi Andy. The bare metal units on a roof stick out like a sore thumb .  Coating them with our…"
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service