The Latest from the Energy Vanguard Blog

Onboarding training for Florida's new certified rating program
Posted by Allison Bailes on July 14, 2017
Last month I told you about the new certified rating and code compliance program that's launching in Florida. I mentioned there will be a training for it at the Southeast Building Conference (SEBC) in Orlando this month. And now I have the details. If this is something you might be interested in,...
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ASHRAE commercial building engineers live in residential buildings
Posted by Allison Bailes on June 29, 2017
I've just returned home from Long Beach, California, where I've spent the past five days attending the ASHRAE conference, which focuses on heating, ventilation, air conditioning, and refrigeration. One of the things I heard there was this statement:  95% of ASHRAE members work on commercial...
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Things we should ban to improve home building in America
Posted by Allison Bailes on June 10, 2017
Let's face it. The state of home building isn't good. Yes, we have building science and energy codes and green building programs out the wazoo. We have cool new products and home energy raters and even Joe Lstiburek. Despite all this, we still have wild ductopuses, holey air barriers, and insipid...
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Duct design schematic diagram showing vents and air flow
Posted by Allison Bailes on June 9, 2017
To this point in our little series on duct design, we've been calculating intermediate quantitites: available static pressure, total effective length, and friction rate. Today we use all that to find out how big the ducts need to be. We're following the Manual D protocol for duct design, a standard...
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UL and Intertek partner with home builders in new home energy rating program for Florida
Posted by Allison Bailes on June 8, 2017
In case you didn't see the announcement out of Florida, two big well-known names have entered the market for home energy ratings and energy code compliance. Underwriters Laboratories (UL) and Intertek are working with the Florida Home Builders Association (FHBA) certify home energy ratings, blower...
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Garage ceiling joists that terminate at a good air barrier
Posted by Allison Bailes on June 6, 2017
When I go into homes being built before the drywall goes up, one thing I always look for is how well they did with the ceiling joists in the attached garage. I've written about it numerous times here in this blog. At least here in Georgia, it's almost always done wrong unless the home builder has...
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Stop Plate Tectonics, one of my favorite T-shirts
Posted by Allison Bailes on June 2, 2017
So the United States has announced it's withdrawing from the Paris Accord, the international agreement with nonbinding measures to mitigate the effects of climate change. Now everyone's up in arms, speaking in exasperated tones about the travesty of this decision. "But...but...the science," they...
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Friction rate can be used in a duct calculator to size ducts
Posted by Allison Bailes on June 1, 2017
Today's installment in the duct design series is a simple one. It's just a straightforward calculation that gives us the design friction rate from the two quantities I discussed in my last two articles. In part 2, I told you about available static pressure (ASP). In part 3, I covered total...
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The majority of Passive House projects in North America are certified through PHIUS
Posted by Allison Bailes on May 31, 2017
The Pembina Institute published a report on Passive House last year. Titled Accelerating Market Transformation for High-Performance Building Enclosures, the report looks at the challenge of climate change, what Passive House has to offer, the market for high-performance buildings, and more. In the...
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Length and equivalent length in duct design
Posted by Allison Bailes on May 30, 2017
Today we move another step down the road of duct design. I started the series with a look at the basic physics of air moving through ducts. The short version is that friction and turbulence in ducts results in pressure drops. Then in part 2 I covered available static pressure. The blower gives us a...
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