Garbage bags can be pretty handy components of an HVAC contractor’s tool kit, research in 2003 at Lawrence Berkeley National Laboratory (LBNL) (see “Air Flow Measurements in the Bag,”HE Sept/Oct ‘02 p. 8).Toting around a laundry basket is also a good idea. Indeed, contractors can often diagnose HVAC system pressures more accurately by using these common household objects than they can using commercially available flow hoods.


We researched the use of garbage bags as a measurement tool for two main reasons. First, bag filling has the advantage that it gives a direct volumetric flow without relying on flow measurement techniques that only sample part of the flow or assume a degree of flow uniformity, as almost all of the other techniques do. Second, as a demonstration of high or low flows to homeowners—or builders and HVAC contractors—bag filling has a direct visual element that is
very appealing.


See: "Garbage Bags and Laundry Baskets" by Iain Walker, Home Energy, Nov/Dec, 2003

Views: 65

Replies to This Discussion

This photo is a bit hokey and contrived. They are in a shower. Why would there be a supply or return duct in the shower anyway? Perhaps they are doing something more kinky or just kidding around.

RSS

Discussion Forum

Seeking a Flow Hood

Started by George Matthews Apr 10. 0 Replies

Affordable Manometers?

Started by Isaac Savage. Last reply by Pete Stoermer Feb 15, 2016. 3 Replies

Looking For A Retrotech Duct Tester ?

Started by Chris Schiewer. Last reply by Jamie Kaye Dec 16, 2015. 1 Reply

Buying Used Equipment

Started by Nick Semon May 18, 2015. 0 Replies

Used Blower Doors?

Started by Isaac Savage. Last reply by Cameron Millard Jan 16, 2014. 3 Replies

Latest Activity

tedkidd replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"Yeah. Gas water…"
21 hours ago
Eric Kjelshus replied to Bob Blanchette's discussion Tankless Water Heaters... has their time finally come?
"With super cheap natural gas prices now, still worth going all electric?  Tankless needs a lot…"
22 hours ago
Stuart Langley liked Chris Clay's photo
yesterday
David Butler replied to David Butler's discussion How would you insulate this roof?
"Stuart, I wasn't considering the copula windows... yes, those would indeed need to be…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"Well, @David Butler, you have seen the property more accurately than I have, but my impression of…"
yesterday
David Butler replied to David Butler's discussion How would you insulate this roof?
"@ Stuart,I don't think there's any concern about impact of 4" build-up on elevation…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"So this building has a few issues with air leaks and air leaks have so much to do with discomfort…"
yesterday
Stuart Langley replied to David Butler's discussion How would you insulate this roof?
"John Hatfield has the right idea here for a new roof deck. Polyiso boards always need a good stout…"
yesterday

Photos

  • Add Photos
  • View All

© 2017   Created by Home Performance Coalition (HPC)   Powered by

Badges  |  Report an Issue  |  Terms of Service