David Butler
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  • Huachuca City, AZ
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David Butler's Discussions

RESNET gets serious about modeling platform consistency

Started Jan 12 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

Belgium’s Lavish Energy Use Sheds Light on More Than Just Its Roads

Started this discussion. Last reply by Don Hynek Dec 18, 2017. 1 Reply

As an avid amateur astronomer, the mitigation of light pollution is one of my passions, notably dovetailing with my professional passion for efficient design. The most efficient outdoor lighting…Continue

Beginners Guide: Managing Subscriptions on Home Energy Pros

Started this discussion. Last reply by Diane Chojnowski Nov 21, 2017. 2 Replies

New members may find subscriptions a bit confusing at first. I know I did. As you'd expect, when you create a new discussion or post a comment, you're automatically subscribed to comment…Continue

Welcome Home Performance Forum Members! (formerly RESNET BPI - Energy Audit and Home Performance)

Started Nov 18, 2017 0 Replies

Last month the Home Performance Forum merged with Home Energy Pros, now under the Home Performance Coalition banner. Members of the Home Performance Forum who are not already Home Energy Pro members…Continue

 

David Butler's Page

Latest Activity

David Butler replied to Jignesh's discussion Efficiency of furnace
"Adding to Sean's comment... The reason a 90%+ furnace uses a PVC flue (as opposed to metal) is because the flue gas is cooler, compared to a conventional 80% furnace, which loses 20% up the flue. By design, higher efficiency furnaces extract…"
Feb 15
David Butler commented on Home Energy Magazine's blog post Andrew Scatizzi- Stick to the Basics in New Construction
"Given the location referenced in the article (southern Texas), I was surprised by what was not mentioned... windows!  In cooling dominated climates, glazing represents the largest load by far and it doesn't cost much if anything to shave…"
Feb 12
David Butler replied to Dennis's discussion Hoping to know more about the two-stage furnaces..
"Regarding filters... The primary purpose of a filter is to protect the blower and other furnace components, and secondarily, to improve indoor air quality. The least expensive type of filter is fiberglass mesh. It's also the least effective as…"
Feb 1
Scott Doyle liked David Butler's discussion RESNET gets serious about modeling platform consistency
Jan 18
David Butler posted a discussion

RESNET gets serious about modeling platform consistency

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 situations where a home could have a different HERS Index Score based upon which software program is being used.RESNET has formed a HERS Software Consistency Task Group to oversee the work on the common schema, collaborative modeling and adoption of a single calculation engine. For more information, check…See More
Jan 12
David Butler replied to Dav Camras's discussion Experience with new energy monitoring tools such as Curb, Sense, Nerio and Smapee
"I hate to say it, but this space (home energy monitors) now appears to be dominated by dot.com 'app' developers who lack a mature understanding of what's involved in data logging & graphing algorithms. BTW, the Brultech monitor…"
Jan 9
David Butler replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"@Tray, the staging logic is described on pg 85 of the furnace installation manual. In particular, here's what it says: "This furnace can operate as a two--stage furnace with a single-stage thermostat because the furnace control CPU…"
Jan 5
David Butler replied to Payal Nene's discussion Desuperheater
"A desuperheater in the context you're referring to is an add-on (secondary) heat exchanger that transfers otherwise wasted heat from an air conditioner's hot gas line to a storage water heater. It requires expert installation skills and…"
Jan 3
David Butler replied to Tray Biasiolli's discussion Two-stage furnace, control at furnace or thermostat?
"I'm not sure about the Ecobee Smart Si (I couldn't immediately find the install manual) but this FAQ (http://bit.ly/2Cf2UsR) describes Ecobee's staging logic -- it's selectable based on either elapsed time or temperature…"
Jan 2
Don Hynek replied to David Butler's discussion Belgium’s Lavish Energy Use Sheds Light on More Than Just Its Roads
"I read the same article. Nothing of technical interest, but the policy side of me loved it. Every economist knows -- incentives matter. "It is difficult to get a man to understand something, when his salary depends upon his not…"
Dec 18, 2017
David Butler replied to Dav Camras's discussion Experience with new energy monitoring tools such as Curb, Sense, Nerio and Smapee
"@Dav, 240-volt circuits are dedicated to a single appliance so circuit monitoring with CT's provides per-appliance data. I don't think it makes sense to try to use circuit level monitoring for plug & lighting loads. TED, Brultech and…"
Dec 14, 2017
David Butler replied to Dav Camras's discussion Experience with new energy monitoring tools such as Curb, Sense, Nerio and Smapee
"I think anyone who does energy audits or otherwise advises homeowners on energy reduction should invest in circuit-level energy monitoring for their own home. On my previous all-electric home, I installed the Brultech ECM-1240 with six 240-volt…"
Dec 14, 2017
David Butler posted a discussion

Belgium’s Lavish Energy Use Sheds Light on More Than Just Its Roads

As an avid amateur astronomer, the mitigation of light pollution is one of my passions, notably dovetailing with my professional passion for efficient design. The most efficient outdoor lighting concentrates its light on the ground rather than illuminating the sky. Actually, the most efficient outdoor light is one that is turned off, except when needed :=)Here's something I bet you weren't aware of. I know I wasn't....Most European cities turn off or dramatically reduce street lighting…See More
Dec 13, 2017
David Butler replied to Dav Camras's discussion Experience with new energy monitoring tools such as Curb, Sense, Nerio and Smapee
"Steve, my understanding from having followed NILM research in years past is that the monitoring system would need to have a manual mode whereby you could turn on a specific appliance (plug load or otherwise) and identify it to the system. Presumably…"
Dec 11, 2017
David Butler commented on Blake Reid's blog post Heating Houses in Hawaii (pt. 1)
"I haven't used Treat but if it has a Design Heating and Cooling load report, I'm sure it's based on the design temperatures. And since it has the TMY3 hourly climate files, it can easily calculate the design temperature for any TMY3…"
Dec 11, 2017
David Butler replied to Dav Camras's discussion Experience with new energy monitoring tools such as Curb, Sense, Nerio and Smapee
"re: Scott's comment about The Energy Detective monitoring individual appliances... TED uses a very crude method to recognize specific appliances, all done in software based on changing in power. As Scott said, it's terrible (I would have…"
Dec 11, 2017

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

 
 
 

Forum Discussions

Insulation Blower Recommendations?

Started by Jim Conlon in General Forum. Last reply by Brad Cook 7 hours ago. 5 Replies

Best brands for furnace

Started by Jignesh in General Forum. Last reply by Eric Kjelshus 9 hours ago. 2 Replies

Efficiency of furnace

Started by Jignesh in General Forum. Last reply by Eric Kjelshus 10 hours ago. 10 Replies

2005 EPAct tax credit

Started by Mandy Leazenby in General Forum. Last reply by Sean Lintow Sr Feb 15. 3 Replies

Latest Activity

Brad Cook replied to Jim Conlon's discussion Insulation Blower Recommendations?
"Most rental machines will not put out the minimum required pressure for dense-packing. There are…"
7 hours ago
Brad Cook replied to Jim Conlon's discussion Insulation Blower Recommendations?
"We have been using the Intec Force II for almost 10 years. It only takes about 1 1/2 bags at a…"
7 hours ago
Eric Kjelshus replied to Jim Conlon's discussion Insulation Blower Recommendations?
"Most generator are more efficiency at 240 volt.   Its  about the total watts more…"
9 hours ago
Eric Kjelshus replied to Jignesh's discussion Best brands for furnace
"Its more about the install and air flow than the box brand,  Most brands about the same if you…"
9 hours ago
Eric Kjelshus replied to Jignesh's discussion Efficiency of furnace
"OK lets say you have a gravity air system with a 80% burn on heat exchanger with out the 8"…"
10 hours ago
John Nicholas replied to Jignesh's discussion Efficiency of furnace
"System Efficiency is great.  Not much use, if you don't intend to fix the various…"
19 hours ago
John Nicholas replied to Jignesh's discussion Efficiency of furnace
"Furnaces and all HVAC Equipment is rated by AHRI.  You can get the certification as to the…"
19 hours ago
Jacob Corvidae replied to Diane Chojnowski's discussion Support Mike Rogers in the group News & Announcements
"Hey Mike! We're all routing for you! Don't hesitate to ask for help.  Jacob"
19 hours ago
Jacob Corvidae joined Diane Chojnowski's group
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News & Announcements

Share your news and announcements with the community in this group.To post news or an announcement,…See More
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Diane Chojnowski added a discussion to the group News & Announcements
20 hours ago
Profile IconJeannette Moore, David Carson, Jesse Smith and 3 more joined Home Energy Pros Forum
21 hours ago
Home Energy Magazine's blog post was featured

How We Turned Our House into a Giant Foam Box, Part I — Wall Insulation By Wen Lee

Chris Stratton and Wen Lee are a husband-and-wife team living in the Los Angeles area who are DIY…See More
yesterday
Home Energy Magazine posted a blog post

How We Turned Our House into a Giant Foam Box, Part I — Wall Insulation By Wen Lee

Chris Stratton and Wen Lee are a husband-and-wife team living in the Los Angeles area who are DIY…See More
yesterday
Chris Stratton replied to Chris Stratton's discussion Technical question about mini split heat pump line set maximum length
"Hi Chris, Thanks again for your help. Update: the system is now up and running. Chris"
yesterday
Home Performance Coalition's blog post was featured

From Philly to DC: Join Us on Capitol Hill

By now you have probably heard – as part of this year’s …See More
yesterday
Diane Chojnowski added a discussion to the group News & Announcements
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Nominate a visionary leader for the Linda Wigington Leadership Award

The Linda Wigington Leadership Award celebrates visionary leaders doing extraordinary work to…See More
yesterday
Home Performance Coalition liked Chris Morin's blog post HVAC: A Fast Growing Career Opportunity
yesterday
Home Performance Coalition liked Diane Chojnowski's blog post Home Performance Coalition Calls on Congress to Support Federal Energy Efficiency Programs
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Home Performance Coalition liked Home Energy Magazine's blog post Andrew Scatizzi- Stick to the Basics in New Construction
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