Iain Walker and Max Sherman developed the DeltaQ test in 2002 to provide a more accurate measurement of duct leakage. The test is relatively easy to perform, and it uses less time, less equipment, and less labor than the existing tests.

As they write in the September/October, 2002 issue of Home Energy, "For many years, building scientists have known that information on duct leakage can be obtained using blower door tests that include the duct system. However, most efforts have focused on using a single test pressure and some assumptions about converting measured air leakage flow to actual leakage at operating conditions.The DeltaQ test takes a different approach. It measures air leakage flows for the ducts and the building envelope over a large range of pressures, just as normal blower door testing does.

We call it DeltaQ because “Q” is the common term used for air flow, and “delta” is the common term used for differences. The test is based on measuring the change in flow through duct leaks as the pressure across those leaks is changed by turning the HVAC system air handler on and off." Read on...

Tags: Delta, Iain, Max, Q, Sherman, Walker, duct, homeenergy.org, leakage, test

Views: 7

Videos

  • Add Videos
  • View All

Twitter

Latest Activity

Empower Efficiency added a discussion to the group Job Board
Thumbnail

Position Opening: Local Community Outreach Specialist, Energy Efficiency (San Carlos, CA)

Local Community Outreach Specialist, Energy Efficiency (San Carlos, CA) Job Title: Local Community…See More
yesterday
Amber Vignieri posted a blog post

Elevate Energy Mythbusters: Windows & Attics Edition

This blog post is guest written by former staff member Eric Keeley.Great enthusiasm for home energy…See More
yesterday
Glen Gallo replied to Diane Chojnowski's discussion Poll: What is you favorite or most important home performance diagnostic or measurement tool?
"I agree with Ted. If I could bring just one piece of equipment it would be the blower door. It has…"
yesterday
Glen Gallo replied to Shaun 's discussion Commercial duct testing
"If above the ceiling tiles the wall is a finished assembly and there is insulation on or under the…"
yesterday
Tom White's video was featured

Combustion Appliance Zone Testing (CAZ) Made Easy (March 24, 2016)

Combustion Appliance Zone Testing (CAZ) Made Easy (March 24, 2016) -Gauge Fundamentals -Adapting to the new BPI standard -RESNET testing requirements -NFPA testing requirements -Best practices for best results
yesterday
Profile IconLaura Capps and Bret Abrams joined Home Energy Pros
Thursday
Olivia Taylor posted a blog post

5 Key Reasons Why Rooftop Solar Is Popular In The US

The rapid switch from traditional electricity to clean, economical and renewable solar energy is…See More
Thursday
Adam Swain posted a blog post

Top 5 Tips For Hiring A Crawl Space Contractor

A homes crawl space is one of the few places most homeowners try to avoid at all cost, and for good…See More
Wednesday

© 2016   Created by Lawrence Berkeley National Laboratory.   Powered by

Badges  |  Report an Issue  |  Terms of Service