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: 1680

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

Videos

  • Add Videos
  • View All

Latest Activity

Chris Woods added a discussion to the group Energy Auditing Equipment for Sale, Trade or to Purchase
Thumbnail

Minneapolis Blower Door Fan and Door frame $990 OBO

I have a used Minneapolis blower door fan (fan only, no controls or panel) and the blower door…See More
14 hours ago
Profile IconManuela L Heyn and Paul Nagel joined Home Energy Pros
17 hours ago
Bill Spohn replied to Eric Sperline's discussion Wanted: Energy Auditing Equipment for sale in the group Energy Auditing Equipment for Sale, Trade or to Purchase
"If you choose to buy new, give TruTech at call at 1-888-224-3437 option 1"
19 hours ago
Home Energy Magazine's blog post was featured

The Legends of Home Performance

A project long in the making, we're happy to finally reveal some of our Legends of Home Performance…See More
21 hours ago
Quinn Korzeniecki replied to Larry R Waters's discussion BPI Anaylist
"Hi Larry, We're glad you're reaching out to hire some BPI folks! You can also submit…"
yesterday
Larry R Waters posted a discussion

BPI Anaylist

Industry leader in the north bay area California. Looking for experienced professionals and future…See More
yesterday
Larry R Waters joined Diane Chojnowski's group
Thumbnail

Job Board

This group is for posting jobs related to all aspects of the home performance industry including…See More
yesterday
John Nicholas replied to Jim Fowler's discussion TREAT modeling of mid-rise apartments low heating load
"So why is tenant behavior significantly different in this building?"
yesterday

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