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: 1701

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

Latest Activity

Caleb Hill is now a member of Home Energy Pros
11 hours ago
Mike Pagozalski replied to Brent Shapiro's discussion Investigating 3257KWH monthly usage issue.
"I would strongly recommend having an actual licensed electrician come out evaluate the entire…"
16 hours ago
Green ID posted blog posts
yesterday
Brad Cook replied to Brent Shapiro's discussion Investigating 3257KWH monthly usage issue.
"Jason's suggestion my be a quick way to isolate the high load, IF you have an old style meter…"
yesterday

Photos

Loading…
  • Add Photos
  • View All

© 2017   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service