Energy Loss: Air Exfiltration

[Kevin A. Richardson]

Here are a few images of heat loss (exfiltration) at exterior envelope.

Kevin

[lolsen]

Kevin

I realize that you have been doing this longer than myself, but I took some pictures that are similar and was wondering if there is a reflection from the window?

Your comments please

Thanks
Lawrence Olsen

[Kevin A. Richardson]

Originally Posted by lolsen

Kevin

I realize that you have been doing this longer than myself, but I took some pictures that are similar and was wondering if there is a reflection from the window?

Your comments please

Thanks
Lawrence Olsen

If you are referring to the tree branches in the windows, yes

Kevin

[lolsen]

No I am refering to the lighter area above the windows.

Lawrence

[Kevin A. Richardson]

Originally Posted by lolsen

No I am refering to the lighter area above the windows.

Lawrence

You mean the hot air exfiltration leaking from the top of the windows. That's no reflection, trust me. It's hot air leaking from the windows These are older double hung windows. Most of the window locks at the meeting rails were worn or loose causing the upper sash to drop. I confirmed the gaps at the top of each of these windows. Very leaky!!

Kevin

[lolsen]

Thanks for that. I stand corrected.
If I could figure out how to get a picture on here I would post the one that I have.

Lawrence

[Kevin A. Richardson]

Originally Posted by lolsen

Thanks for that. I stand corrected.
If I could figure out how to get a picture on here I would post the one that I have.

Lawrence

When you are posting a reply to a thread, just hit the "Manage Attachments" button under additional options. A pop-up window will appear where you can brouse your computer to find the file you want to upload. Once the file uploads, close the attachment window and post the thread.

Love to see your images

Kevin

[lolsen]

Here they are let me know what you think.





Thanks
Lawrence

[Kevin A. Richardson]

Originally Posted by lolsen

Here they are let me know what you think.

Attachment 18313

Attachment 18314

Thanks
Lawrence

Awesome! I really like the second one. Good example of air exfiltration.

What camera do you have?

Kevin

[Carl Pennick]

Hello Kevin & Lawrence,
Nice pics
What time of the day or night are taking these readings.

[David A. Andersen]

Scans come out nice when you have a good Delta T. (70 degrees?)
It's below zero F there. The hot spots are -.76F

[Kevin A. Richardson]

Originally Posted by cpennick

Hello Kevin & Lawrence,
Nice pics
What time of the day or night are taking these readings.

Night time...few hours after sunset.

Kevin

[Kevin A. Richardson]

Originally Posted by dandersen

Scans come out nice when you have a good Delta T. (70 degrees?)
It's below zero F there. The hot spots are -.76F

For an effective exterior building envelope scan you have to have a minimum of 18 deg F temperature differential. Not only for the time of scan, but for several hours before the scan.

I'm not sure how Lawrence tuned his camera, but my Delta-T was around 35 deg F.

Kevin

[David A. Andersen]

Not only for the time of scan, but for several hours before the scan.

That is hint to the brain teaser at:
http://www.nachi.org/forum/f58/try-brainteaser-25304/

[lolsen]

Thanks guys

Mine were taken about 5 hours after sunset with a outside temp of -25C. (sorry for the metric). These pics were taken with a FLIR EX320 with a wide angle lens.

The delta T that you are talking about is that outside temp from mid day to night or are you talking from inside to outside?

Lawrence