When doing a blower door test, do you ever use long term average? Why or why not?

Digital pressure and flow gauges have an option for time averaging, such as 1, 5 or 10 seconds, long term or a manual time average option.

Under what circumstances would you use the long term average and why?

Views: 149

Reply to This

Replies to This Discussion

When the wind is breezy, I use long term averaging. The more the pressure jumps around due to breezes, the longer the term that I use. Even then, I mentally average the readings. This is after I have taken steps to shield the end of the outside hose from the wind.

Hi Kim,

Wind is probably the most frequent reason for using the time averaging with our manometers, but there is another that we need to be careful with.  Manometers are unique in that they ignore barometric pressures.  Place your refer tube out the front door and walk your manometer (long tube) upstairs or into the basement and even though the top to bottom pressure may vary (on a cold day) by 50 pascals or more our manometers will register very little.  When the temperature of our tubes and the air inside is the same as in the house, any changes in elevation are canceled out.  However, if those tubes just came out of an ice cold vehicle, or a hot one, and have not fully acclimated, our readings will drift.  In this case, before we start averaging we need to allow those tubes to become room temperature.  The section of tube that goes outside needs to acclimate as well.

Bud

RSS

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

Aaren Stewart posted a discussion

Let's solve this HVAC quiz!!!

Answer these three simple problems of your HVAC systems, let's see how much you know your system…See More
43 minutes ago
Chris Laumer-Giddens posted a blog post

Mini-Split Heat Pumps are Quirky, Especially their Capacity

Mini-Split Heat Pumps are Quirky and Still EffectiveThe name "mini-splits" generally refers to heat…See More
9 hours ago
Jan Green posted an event

Solar Course for Appraisers at SRP's Pera Club

November 13, 2014 to November 14, 2014
"As the US continues to search for energy alternatives, properties improved with solar PV…See More
9 hours ago
Hal Skinner replied to Hal Skinner's discussion What an RCC can do with no R- insulation in the walls.
"Just like paint.  RFoller and brush or strong airless sprayer.  It has the consistency of…"
13 hours ago
Hal Skinner replied to Hal Skinner's discussion What an RCC can do with no R- insulation in the walls.
"ty and thermal emission leveld of many materials including bricks and white paint.  They do…"
13 hours ago
Hal Skinner added a discussion to the group The RCC Classroom (Radiant Control Coatings)
Thumbnail

Walmart goes green in Texas

We applied cour RCC to 5 Walmart superstores in Texas.  Worked great and they wanted it.  Then they…See More
13 hours ago
Kim Tanner replied to Trip Smith's discussion Where to spend my marketing dollars?
"Direct mail doesn't do very much, in my opinion, unless you have awesome coupons! Honestly,…"
14 hours ago
Hal Skinner replied to Hal Skinner's discussion What an RCC can do with no R- insulation in the walls.
"Mornn Trip and Bud, In this case all I can do is report it exactly as it was told to me.  I…"
14 hours ago

© 2014   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service