I am involved in a QC program that straddles two of the four zones BPI uses to identify LBL "N" factors. Has anyone ever seen a map with enough resolution that could help determine whether a project lands in one zone or another? My area of concern is the division between zones 3 and 4 in southern California.  

Has anyone correlated the LBL N-factor zones with California Energy Commission climate zones?

With a requirement to meet ASHRAE standards, the 15% factor difference between zones could be significant.

Views: 1369

Replies to This Discussion

If you are in doubt, just use the middle value common to both zone 3 and 4:  23. 

 

The whole formula isn't all that precise anyways.  The N factors for each zone are a range of four numbers - that should tell you something.  Using the lower number will allow you to seal up a house tighter without having to do ASHRAE 1989.   But to meet ASHARE 62.2 - 2010, you probably have to install some kind of ventilation anyways - the only question is what cfm rate to set the fan at.

 

If you want to be more precise, use ASTM 779 and ASHRAE Standards 119 and 136 to calculate your own N factor instead of using that burry map.

 

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.  Home Energy Pros is sponsored by the Better Buildings Residential Network.

Latest Activity

Colin Genge posted a blog post

What needs to be done to get builders to follow Code for duct and envelope leakage?

“Have you been ripped off for $100,000 by your builder?  Let us help you get what you paid for! …See More
4 hours ago
Green Training USA posted an event
Thumbnail

Proctor’s Without Borders at Online

July 29, 2015 to August 7, 2015
Complete your training at your own pace and take exams when you want and where you want. No…See More
12 hours ago
Gar Swaffar commented on Gar Swaffar's blog post Cost of using a BPI QCI?
"Ip.s., I would presume there will be a difference between the Left Coast and nearly everywhere else."
yesterday
Gar Swaffar posted a blog post

Cost of using a BPI QCI?

I'd like to find out if there is a consensus on a rule of thumb cost of a QCI onsite for…See More
yesterday
Gar Swaffar is now a member of Home Energy Pros
yesterday
Colin Genge posted an event

Infiltration and Duct Leakage with BPI at Online

July 30, 2015 from 1pm to 2pm
Blower door and duct test requirementsCalculating resultsCertification optionsTest preparation and…See More
yesterday
Stacy Hunt posted an event

Volunteers needed for the upcoming U.S. Department of Energy Solar Decathlon in Irvine, CA at Orange County Great Park

October 8, 2015 at 11am to October 18, 2015 at 7pm
Volunteer for the upcoming U.S. Department of Energy Solar Decathlon 2015, taking place Oct. 8-18…See More
yesterday
Kim Tanner posted videos
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service