David Butler
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  • Huachuca City, AZ
  • United States
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'Classic' discussion from HP Forum Archives: A deep dive into the merits and pitfalls of energy modeling

Started Oct 29 0 Replies

Those of you who have followed this forum for at least two years may recall the merger between Home Energy Pros and the Home Performance Forum. For the benefit of those who weren't around then (or…Continue

Does IRC preclude use of spray foam to insulate rim bands in unfinished basement? (re: ignition barrier)

Started this discussion. Last reply by David Butler Jan 2. 5 Replies

My new home, currently under construction, has a full basement, half of which will remain unfinished, i.e., no drywall or ceilings. We intend to use that area for storage. My specs call for 2"…Continue

RESNET gets serious about modeling platform consistency

Started Jan 12, 2018 0 Replies

A critical element in ensuring the consistency of HERS Ratings is enhancing the consistency which RESNET accredited HERS Software Programs calculate the HERS Index Score. There are currently…Continue

 

David Butler's Page

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David Butler posted a discussion

'Classic' discussion from HP Forum Archives: A deep dive into the merits and pitfalls of energy modeling

Those of you who have followed this forum for at least two years may recall the merger between Home Energy Pros and the Home Performance Forum. For the benefit of those who weren't around then (or weren't paying attention): the Home Performance Forum was a spin-off from the now-defunct LinkedIn group: "RESNET BPI - Energy Audit and Home Performance", which I 'owned' and moderated from 2009 to 2017. Due to a rash of detrimental changes LinkedIn made to its Groups platform, we moved the RESNET…See More
Oct 29
David Butler replied to Jake Nuckolls's discussion TREAT modeling resources
"I just noticed that archive comment links aren't scrolling down to the comment. To find Gary's 'pet peeves' comment, use your browser to search for "I have read your posts" on the first page. Bill's 'wish…"
Oct 29
David Butler replied to Jake Nuckolls's discussion TREAT modeling resources
"Hi Jake, we had a number of discussions over the years on Treat (and modeling tools in general) in the RESNET BPI Group on LinkedIn. Many of those threads are now archived in the Home Performance Archives (see HP Forum Archives tab on menu bar,…"
Oct 29
David Butler replied to Ed Minch's discussion Solar performance anomaly
"@Daniel, Ed said he has a revenue grade SREC meter, which presumably is the one he's using for  his calculations (right, Ed?).  A revenue grade meter is necessarily on the output side of the inverter, so it would already reflect the…"
Oct 16
David Butler replied to Ed Minch's discussion Solar performance anomaly
"Indeed, I'm not surprised you're already up to speed on how this works. But the size of your discrepancy instilled a wee bit of doubt. You wrote: "The array website tells me two things - my actual usage, and the amount the array has…"
Oct 14
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi Eric, excellent point. Keeping those coils clean is paramount to both short and long term system performance!  But I think multiple cleanings per year by a professional (I see you're a mechanical contractor) is a bit excessive for most…"
Oct 14
David Butler replied to Ed Minch's discussion Solar performance anomaly
"Hi Ed, one possibility is a calibration issue with the inverter meter, but that seems highly unlikely with such a large discrepancy. I've had several clients describe the exact same problem and it always turns out to be a misunderstanding as to…"
Oct 11
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"@Walt, I hesitate to respond since this is rather off-topic, but my previous comment apparently wasn't clear. My rebuttal was directed at your comment that a "...heat pump works much harder on the coldest days."  That's not…"
Oct 3
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Walter wrote: "In truth my heat pump works much harder on the coldest days." This is a common misconception. The magnitude of the outside-inside delta-T has no bearing on the amount of work done by a heat pump over a given period of time.…"
Oct 1
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"The best way to create a positive pressure without imposing an energy penalty is with a simple supply fan. Although it's tempting to want to use a recovery ventilator to mitigate the energy loss, keep in mind that the amount of heat it can…"
Sep 30
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"@Ben, you definitely don't want to use an exhaust-only system to remove radon from a home's interior, since the negative pressure could (likely would) pull more radon into the home!  So if your intent is to use ventilation to mitigate…"
Sep 30
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"It appears the confusion is on my part (semantics). In my mind, a slab in of itself is not a foundation. The foundation consists of your footings and/or thickened portions of the slab, and basement wall to the extent that it's load-bearing. So…"
Sep 29
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"So now I'm confused. If the house has a full basement, what foundation are you referring to? Is your basement not built on a slab? I've heard of basements built on wood foundations, but I've never actually encountered one!"
Sep 28
David Butler replied to Ben Stallings's discussion radon mitigation with HRV?
"Hi Ben, you ask a complex question that depends on other factors beyond the information you provided. Has the house been blower-door tested? If not, do you have a sense of how leaky/tight it is? A reading of 6.5 in a tight house is very different…"
Sep 28
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"I think you took my 'hottest day' comment a bit too literally. In any case, there's no doubt that certain failure modes are more likely as outside temperatures climb (more stress on components). And yes, a heat pump is nothing more…"
Sep 27
David Butler replied to Julie Saporito's discussion Heat pump failure during high heat days?
"Hi Julie, as a point of clarification, in cooling mode a heat pump is essentially an air conditioner, and there's nothing new about A/C failures tied to high heat days. Everyone knows that air conditioners always seem to fail on the hottest day…"
Sep 26

Profile Information

Company
Optimal Building Systems
Role in Home Performance Marketplace
Building energy modeler, Researcher (Lab. academia. etc.), Other
Professional Certification
Other
Website URL
http://optimalbuilding.com
LinkedIn Profile
https://www.linkedin.com/in/davidbutler52/

Comment Wall (1 comment)

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At 9:43am on November 1, 2011, Diane Chojnowski said…

Hi David,

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 add your location on our Member Map!


Thanks!
Diane, HEP Moderator

 
 
 

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