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

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

Profile IconBenney Dornevil, Mike Norvell Sr and Jen Loomis joined Home Energy Pros
10 hours ago
Joanie Minor posted a status
"Home Performance Institute now offers OSHA 10 and Confined Space Classes. Call 203-536-2151 to register."
11 hours ago
Joanie Minor posted a photo
11 hours ago
John Kaye posted a blog post

FREE Home Efficiency & Safety Assessments in the Los Angeles County area.

Since last June I have been qualifying homeowners in the Los Angeles County for the Home Upgrade…See More
16 hours ago
Eric Kjelshus replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Those 240 Volt aquastats shut off and then on kinda quick back on.  The older the tank the…"
21 hours ago
Rod Fox replied to Rod Fox's discussion Does calcification affect electric water heater aquastat temperature sensor performance?
"Well I'd love to tell you folks I found an answer, but I did not... I went to my…"
yesterday
Rod Fox replied to Kevin Eigel's discussion What is the best energy auditing software?
"I've been trying to answer this question for many years and have not yet found an answer.…"
yesterday
Jerry Lawrence posted events
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service