Has anyone done a combustion analysis on a relatively current furnace? Is a 90 truly a 90? Or are the numbers done in lab-like conditions that cannot be reproduced in real time? any info would be appreciated thank you.

Views: 115

Replies to This Discussion

Is there anyone out there? or is this another do nothing site like most of these discussons

Randy,

Very few people can see this post as membership in this group is still quite small.

Feel free to repost on the main Forum page, where all members will see.

Hi Randy,

  Very often when completing combustion analysis on 90+ AFUE furnaces, I tend to get a Steady State Efficiencies that are higher than the rated AFUE!  This is because of the likely test location, being at the flue terminal outdoors.  Due to the loss in flue temp, this drives the SSE up.  If you have significantly low SSE start looking for incomplete combustion (too much excess air, too much gas, etc).  I once tested an 80% AFUE furnace that had so much excess air that the SSE was 68%.  When I ripped the furnace out, there was a huge hole in the back of the heat exchanger that I couldn't see with the scope!  Combustion Analysis not only sold the new unit - but maybe saved the homeowner's life!

Good Luck!

Chris

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

Hal Skinner replied to Richard Beyer's discussion Media Reports Spray Polyurethane Foam Insulation spontaneously combusted a $5M Connecticut Home... "The Conclusion"
""fire origin had overheated and ignited during the curing process." No attorney…"
5 hours ago
John Nicholas replied to Sean Lintow Sr's discussion Blower Doors & Methods Used in the group Best Practices (Residential)
"Different houses, different problems, different approaches. A multipoint gives you a slope. The…"
14 hours ago
John Nicholas replied to Sean Lintow Sr's discussion Blower Doors & Methods Used in the group Best Practices (Residential)
"Bud,  I pretty much agree with Sean's points.  Given the time it takes to set up the…"
14 hours ago
Bud Poll replied to Sean Lintow Sr's discussion Blower Doors & Methods Used in the group Best Practices (Residential)
"A multi-point will take longer, but what will it do for the home owner?  Will it change the…"
16 hours ago
Sean Lintow Sr replied to Sean Lintow Sr's discussion Blower Doors & Methods Used in the group Best Practices (Residential)
"Hmmm good question - personally for air-leakage I would go with multi-point, preferably run from…"
18 hours ago
Richard Beyer posted a discussion

Media Reports Spray Polyurethane Foam Insulation spontaneously combusted a $5M Connecticut Home... "The Conclusion"

OFFICE OF THE FIRE MARSHAL1212 WHITTEMORE RDMIDDLEBURY, CONNECTICUT Fire Investigation Report –…See More
yesterday
Profile IconDavid Hepinstall and Matthew joined Home Energy Pros
yesterday
Steve Leombruno posted a blog post

Static power energy box

Just wondering if You've heard of this Static power energy box that boasts energy consumption…See More
yesterday

© 2015   Created by Lawrence Berkeley National Laboratory.

Badges  |  Report an Issue  |  Terms of Service