John Snell
  • Montpelier, VT
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Another Blog for Thermographers
1 Reply

I don't want to seem self-serving AND I do want folks to know about the blog that Fluke sponsors. I'm one of the prime authors (yes, The Snell Group is still 100% independent of sales!) and spend a…Continue

Started this discussion. Last reply by t hardy Mar 17, 2011.

 

John Snell's Page

Latest Activity

Jim Klebes replied to John Snell's discussion New article on infrared thermography in the group INFRARED THERMOGRAPHY USERS
"Great article John. Your 30 year commitment to the field of thermography is greatly appreciated by us newbies who are trying to catch up with you. I agree that IR is essential to properly determining what is going on with a building's…"
Nov 17, 2011
John Snell added a discussion to the group INFRARED THERMOGRAPHY USERS
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New article on infrared thermography

The Journal of Light Construction has long been respected as a place where builders can educate themselves and share information. I was recently asked to write an article introducing their readers to thermography and how it can be used in the buildings trade. The article is available as a PDF ( …See More
Nov 17, 2011
John Snell added a discussion to the group INFRARED THERMOGRAPHY USERS
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Moisture detection, a fascinating thermal signature

I don't mean to derail folks from this website to ours (I often send folks here too!) but that is exactly what I'm going to do because www.IRTalk.com has a fascinating discussion about thermal signatures of moisture.  http://www.thesnellgroup.com/irtalk/forums/thread/8130.aspx The images are superb and the discussion very educational for any who are using thermal imaging. Maybe we can…See More
Sep 9, 2011
John Snell's blog post was featured

Advanced certification for RESNET Thermographers

I’m just back from the RESNET national conference in Orlando and I am very excited to report that RESNET certification is now available! What’s needed?• You must be a RESNET Building Performance Auditor or a Rater• You must have 3 months experience using thermal imaging and a blower door• You must have taken a training course that complies with the standards of the American Society for Nondestructive Testing (ASNT) If you have these three credentials, you are ready to go under what is called…See More
Aug 30, 2011
John Snell replied to Davide Lanzoni's discussion New York first passivhaus ... in the group INFRARED THERMOGRAPHY USERS
"It is certainly possible as I no longer have the exact specs for the older windows. My belief, however, is that exterior surfaces of both old and new glazings are uncoated so what we are seeing is related only to the difference in actual heat…"
Aug 25, 2011
John Snell replied to Davide Lanzoni's discussion New York first passivhaus ... in the group INFRARED THERMOGRAPHY USERS
"Here is another image showing R=10 windows (Serious brand) on the right and conventional double-glazed, nitrogen-filled windows on the left (there is a screen on the right window of these). Interior temperatures are identical in both rooms."
Aug 21, 2011
John Snell replied to Davide Lanzoni's discussion New York first passivhaus ... in the group INFRARED THERMOGRAPHY USERS
"You should be skeptical, Davide!! Something is clearly not right. Windows are about 20% reflective but all of them at that angle could be reflecting the same cold sky.   I think the interior temperatures of the buildings were different. I have…"
Aug 21, 2011
Tyson Pischel replied to John Snell's discussion Using thermal imagers in the summer in the group INFRARED THERMOGRAPHY USERS
"I have been setting up to inspect about 200 attics that are most likely completely out of compliance with ours(and any) reputable program specs.  While testing a couple of remote camera configurations, I made a pass through the attic with my IR…"
Jul 7, 2011
John Snell replied to John Snell's discussion Using thermal imagers in the summer in the group INFRARED THERMOGRAPHY USERS
"Typically there are several reasons "hot work" is not as easy as working with cooler temperatures, and Matt will discuss these in his webinar next week. First, the delta-temperature (inside to outside) is usually not as great. Second, the…"
Jul 1, 2011
John Snell replied to John Snell's discussion Using thermal imagers in the summer in the group INFRARED THERMOGRAPHY USERS
"The 3F delta is for locating air leakage under RESNET. For locating insulation issues, an 18F delta is required. I agree we can often get by with less of a difference if we understand the conditions, know what we are doing and have a more sensitive…"
Jun 30, 2011
Davide Lanzoni replied to John Snell's discussion Using thermal imagers in the summer in the group INFRARED THERMOGRAPHY USERS
"If my memory is good, RESNET talk of a deltaT of only 3°F for conducting an infrared inspection with blower door: it happens many times and its' about a 100 mK NETD. here are some image with my Ti32.    "
Jun 30, 2011
Michael Stuart replied to John Snell's discussion Using thermal imagers in the summer in the group INFRARED THERMOGRAPHY USERS
"I've got a few inspections in two weeks time.  With my Ti32 and a blower door, I am good to go.  (Sometimes I really don't even need the blower door.   It's all about having the right training, and the right tools…"
Jun 29, 2011
John Snell added a discussion to the group INFRARED THERMOGRAPHY USERS
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Using thermal imagers in the summer

Too many thermographers leave their imagers in the case during the summer. This comes, in part, from the way we used to work when imagers were not nearly as sensitive and our understanding of how to use them was limited to winter work.Get the darned thing out and use it! In most places, on most mornings, you can get successful "winter" images; if not, keep the home closed up for the night and add a bit of heat in the morning before you arrive.Once the day warms, heat flow and thermal patterns…See More
Jun 29, 2011
John Snell posted a blog post

Rebuild the Dream

Many readers will remember Van Jones from the 2009 ACI conference. He is a smart guy and a brilliant presenter. He also, of course, got on someone's sh*t list and had to leave his post in the Obama administration. Van will be on the web tonight via MoveOn.org's Rebuild the Dream Launch Event at 8:15 ET talking about the economy. If you have a chance to tune it, I'm sure you'll find it interesting.See More
Jun 23, 2011
John Snell commented on Michael Stuart's group INFRARED THERMOGRAPHY USERS
"No, despite what some suggest, it is not a simple process to determine R-value or otherwise quantify heat transfer based on a single thermal image. Still, images can be very compelling and other tests can fill in the numbers."
May 26, 2011
John Snell commented on Michael Stuart's group INFRARED THERMOGRAPHY USERS
"Hal, One of the issues you run right into using thermography to show the impact of insulating coatings is that the imagers SEE radiation. Thus if the coating reflects radiation in the wavelengths detected by the imager, you'll see that but that…"
May 26, 2011

Profile Information

Company
The Snell Group
Professional Certification
ASNT NDT Thermal/Infrared Level III certificate #48166
Professional Interests
Infrared thermography, building science
Website URL
http://www.thesnellgroup.com

John Snell's Blog

Rebuild the Dream

Many readers will remember Van Jones from the 2009 ACI conference. He is a smart guy and a brilliant presenter. He also, of course, got on someone's sh*t list and had to leave his post in the Obama administration. Van will be on the web tonight via MoveOn.org's Rebuild the Dream Launch Event at 8:15 ET talking about the economy. If you have a chance to tune it, I'm sure you'll find it interesting.

Posted on June 23, 2011 at 7:44am

Another Blog for Thermographers

I don't want to seem self-serving AND I do want folks to know about the blog that Fluke sponsors. I'm one of the prime authors (yes, The Snell Group is still 100% independent of sales!) and spend a good deal of time crafting what I think is a pretty good blog, all related to thermography and much of it related to building thermography. Michael Stuart, who created the Home Energy Pros Infrared Thermography Users group, also chimes in weekly with his "what is it?" images, all good fun and a…

Continue

Posted on March 15, 2011 at 6:49am

Advanced certification for RESNET Thermographers

I’m just back from the RESNET national conference in Orlando and I am very excited to report that RESNET certification is now available!

 

What’s needed?

• You must be a RESNET Building Performance Auditor or a Rater

• You must have 3 months experience using thermal imaging and a blower door

• You must have taken a training course that complies with the standards of the American Society for Nondestructive Testing (ASNT)

 

If you have these…

Continue

Posted on March 5, 2011 at 8:30am — 1 Comment

Rising home energy costs predicted for 2010-11

The outcome of the election this weeks makes passage of the Home Star bill in the Senate look, unfortunately, less likely than ever. Rather than invest in efficiency, we seem destined to continue to export energy dollars and/or add to the CO2 blanket we've wrapped our Planet in.…

Continue

Posted on November 4, 2010 at 10:00am — 3 Comments

Comment Wall (2 comments)

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At 10:50pm on December 8, 2010, Lorna G. Fear said…
Hi John;

Nice to see you here!
At 10:07am on November 22, 2010, Jonathan Beers said…
Hi John:

Thought you might be interested in this news story. I know aerial thermography has been used many places, including London, but do you have an opinion on projects like this?

Jon Beers (ECW webinar attendee)

>>>
Seeing heat: Utility generating thermal images of homes from high up
Nov 20 - McClatchy-Tribune Regional News - Jon Ericson Waterloo-Cedar Falls Courier, Iowa
Several months from now, Cedar Falls residents will be able to look at a thermal image of their home from a comfortable seat at their home computer.

It will be possible because of two men who crisscrossed the skies over Cedar Falls through the night Thursday, carefully photographing every building in the city with a thermal imaging camera.

Cedar Falls Utilities took advantage of a federal stimulus grant program to create the thermal images. Homeowners and businesses will be able to look at the results and determine if and where more insulation could save money.

The thermal images will display heat loss coming from rooftops.

Pete Olson, CFU energy services manager, said attic insulation provides a lot of bang for the buck.

"It's usually the easiest and most economical way to improve energy efficiency," Olson said.

CFU offers incentives for insulation, picking up 60 percent of the cost for approved, contractor-completed jobs.

CFU teamed with the University of Northern Iowa Center for Energy and Environmental Education and GeoTREE on this project. The CEEE secured a $180,000 grant from the Iowa Office of Energy Independence, money that came from federal stimulus spending.

The two-man crew of George Tatalovich, a pilot from Kucera International of Willoughby, Ohio, and Jason Faulring, an engineer from the Rochester Institute of Technology in Rochester, N.Y., was scheduled to make more than 50 passes over Cedar Falls. On board is $3 million in equipment, using cutting edge technology...for rest of story see:

http://www.energycentral.com/functional/news/news_detail.cfm?did=17836480
 
 
 

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