Basic CAZ instructions may not provide the correct number.

When you measure the worst case depressurization of a CAZ are you measuring the pressure in the appliance room or the room above it?  When your appliance room is in the basement and you run your reference tube upstairs and out the front door, your reading is actually for the room above at the same elevation as the point where your reference tube exits the envelope.  On a cold day, that can change your reading by a couple of Pascals.  And that can be the difference between passing and failing for some appliances.

We all know that the stack effect pressures vary from ceiling to the basement floor and they change with every foot of elevation.  So, how do we measure the pressure in a basement surrounded by dirt and no way to place our reference tube out through a concrete wall?  We calculate the change per foot for the given temperature difference and adjust our reading to the elevation we need.

Anyone doing this?  Anyone  interested?

Bud

Tags: CAZ, reference, tube

Views: 84

Reply to This

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.

Latest Activity

Hal Skinner replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Mornin Brett. 90 to 85, yes a slight variance there.  Same ASTM test, different scientists,…"
8 hours ago
Bret Curry replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Great information Hal. It appears the thermal emissivity in your test was .85 rather than .90. Are…"
9 hours ago
Juan Roca commented on Dale Stephens's blog post LED Lighting - Garage Door opener interference
"Hi,There is a real problem with remote controls and LED lights. However, there is a solution in the…"
16 hours ago
Profile IconJuan Roca and Elizabeth Coe joined Home Energy Pros
yesterday
Casey Gesell posted videos
yesterday
Gerald Shechter posted videos
yesterday
Hal Skinner replied to Hal Skinner's discussion An example of what an RCC can do with no R- insulation in the walls.
"Bret,  here are the 2 reports I referred…"
yesterday
Craig Foley shared George Kopf's discussion on Twitter
yesterday

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service