Rod Fox
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  • Cerrillos, NM
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Does altitude affect AFUE? or just the input/output BTUs?
13 Replies

I searched and searched and searched yesterday for an answer to the question "Does altitude affect AFUE?" but did not come up with any definitive answers. Hopefully this discussion will answer that…Continue

Tags: derate, input, BTUH, altitude, SSE

Started this discussion. Last reply by Rod Fox Jun 26.

Utility company's diabolical rate plans don't save the consumer equivalent to what they conserve
6 Replies

Attached is a spreadsheet I created for a restaurant client comparing two plans and projected kWh savings at 20% and 30%.Currently, they are on the rate plan "3B". If they were to remain on this plan…Continue

Tags: savings, vs, actual, plans, rate

Started this discussion. Last reply by Bud Poll Aug 13, 2012.

Efficiency First Membership Pricing
4 Replies

Does anyone else find the $300 membership fee a bit rich for a business consisting of only one self-employed owner?At $100 I might consider it, but at $300 they've pretty much prevented me from…Continue

Tags: overpriced, membership, first, efficiency

Started this discussion. Last reply by Rod Fox Jul 26, 2012.

Utility Meter Accuracy
40 Replies

Well I have to admit that I'm stumped with an energy audit I've been working on for the past two months. Perhaps someone can point me in the right direction...My client contacted me concerned that…Continue

Tags: accuracy, meter, utility

Started this discussion. Last reply by Rod Fox Jul 26, 2012.

 

Rod Fox's Page

Latest Activity

Rod Fox replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Hans,Putting it the way you spelled it out so well helped me understand the whole process. So thanks also for your comments. I think this question has now been adequately answered! Thanks to everyone in this community. This website is full of…"
Jun 26
Rod Fox replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Dale, I appreciate your comments, they make perfect sense. It seemed to me when I was researching this in the past that I came to the same conclusion as you, that it's actually possible the efficiency improves with altitude. Not sure I actually…"
Jun 26
Hans Joachim Preiss replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Rod, Correct me if I am wrong, but you're saying "AFUE" but really mean "actual efficiency". AFUE is measured under controlled conditions in a lab at or near sea level, and has little in common with the actual efficiency…"
Jun 26
Eric Kjelshus replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Afue is not a real number.   Look at system Efficiency BTU in vs BTU out,  Its more real.    Look at gas sold in boston most of east big citys are at 1050 BTU's per cub foot   Kansas City is about 950-1050  …"
Jun 25
Morgan M Audetat replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"I beg your pardon Rod, To answer your question, Dale has it right of course.  There are two ways to adjust for altitude above 2000 ft. elevation. One is to de-rate the appliance and the other is to de-rate the gas.  Here in Minneapolis we…"
Jun 19
Dale Pickard replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Hello Rod, I don't think that de-rating atmospheric boilers for altitude should affect efficiency, either "annual" or instantaneous - just output. If anything the output might increase some as the heat exchanger in the de-rated boiler…"
Jun 19
Rod Fox replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Well, I don't really think I asked the wrong question, "Does altitude affect AFUE?" Because that's what I wanted to know. That's the number I use in many calculations, to present to the layman (my customers)…"
Jun 17, 2014
Morgan M Audetat replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"First, it is the wrong question. AFUE is a comparative consumer number whereby the layman is presumably assisted in choosing an appliance by its advertised efficiency.  If we are addressing condensing appliances, all others being a waste of…"
Jun 17, 2014
Rod Fox replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"So.... seriously? No one can answer this question about altitude affecting AFUE? Sheesh! Alrighty then, seems I'm going to have to bust out a can of triple dog dare for all you HVAC experts to jump on. Or can it be that folks really don't…"
Jun 1, 2014
Rod Fox's discussion was featured

Does altitude affect AFUE? or just the input/output BTUs?

I searched and searched and searched yesterday for an answer to the question "Does altitude affect AFUE?" but did not come up with any definitive answers. Hopefully this discussion will answer that question more easily for folks in the future.Derating combustion appliances typically applies the equation of about 2% per 1000 ft above sea level (from most manufacturer's specifications). So here in Santa Fe (at 7000 ft ASL), the derate would be 14%. Applying this to a 100 MBTUH input capacity…See More
May 28, 2014
Matthew Brazil replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"I'm not positive that I have an answer for this as well but Iam interested in the topic and would guess that the answer lie in the ASHRAE Standard 103 Method of Testing for Annual Fuel Utilization Efficiency of Residential Central Furnaces and…"
May 28, 2014
Rod Fox replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Hey Bud, thanks for interrupting the sound of crickets! ;) In reading that paper, just jump right to the appendix E as that paper has an immense amount of information. I generally read the whole thing and it took me a good hour and a half to…"
May 27, 2014
Bud Poll replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Hi Rod, I'm certainly not an expert on this topic, but wanted to let you know someone is following to see if an answer pops up.  And yes I hear the crickets as well. The paper in the link was a bit too long for me to read it all so…"
May 27, 2014
Rod Fox replied to Rod Fox's discussion Does altitude affect AFUE? or just the input/output BTUs?
"Do I hear crickets? Nobody has any response to this? Was it something I said? :p..."
May 26, 2014
Rod Fox posted a discussion

Does altitude affect AFUE? or just the input/output BTUs?

I searched and searched and searched yesterday for an answer to the question "Does altitude affect AFUE?" but did not come up with any definitive answers. Hopefully this discussion will answer that question more easily for folks in the future.Derating combustion appliances typically applies the equation of about 2% per 1000 ft above sea level (from most manufacturer's specifications). So here in Santa Fe (at 7000 ft ASL), the derate would be 14%. Applying this to a 100 MBTUH input capacity…See More
May 22, 2014
Rod Fox replied to Kari Riedel's discussion Any feedback on Advanced Energy Panels (window insulation panels)?
"Stan, it might be time to search in your medicine cabinet for a chill pill... ;) This product is great because of the following factors (and I have nothing to do with the company): Highly reduced air-leakage (win) Inexpensive when compared to…"
Feb 10, 2013

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Advanced Metrics Group
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BPI Building Analyst Professional
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Renewable energy systems
Simplification
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http://www.amgi.net
LinkedIn Profile
http://www.linkedin.com/pub/rod-fox/15/8b7/871

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At 1:03pm on January 4, 2011, Diane Chojnowski said…

Hi Rod,

Welcome to Home Energy Pros! Feel free to join the conversation in the Forum and Groups. And share your energy efficiency photos, videos and upcoming events. If you're blogging about home performance, this is the
place for you!

Don't forget to upload your profile photo. And, add your location on our Member Map!

Thanks!
Diane, HEP Moderator

 
 
 

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