manual D

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The Difficulties of Third-Party HVAC Design

How do we get everyone on the same page?

Posted on Oct 4 2017 by Allison A. Bailes III, PhD

What if a builder refused to build from plans drawn by an architect? What if a tile installer refused to implement designs handed to them and instead did their own thing? What if an HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. contractor told a potential client they wouldn't install a system designed by a third party to ACCA protocols?

One of those questions is more real than the others. Of course builders build from architects' plans and tile installers don't throw out designs they're asked to implement. But third-party HVAC design is a different animal.

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Image Credits:

  1. Energy Vanguard

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A New Online HVAC Calculator Is Available

Elite Software says its software works on smartphones, tablets, and internet-connected computers

Posted on Aug 18 2017 by Scott Gibson

A software company specializing in products for builders has released an online program that performs three important calculations used in the design of HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. systems: Manual J, Manual D, and Manual S calculations.

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Image Credits:

  1. Elite Software

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The Joy of Flex

A recap of my Building Science Summer Camp presentation

Posted on Aug 16 2017 by Allison A. Bailes III, PhD

I recently spoke at the Westford Symposium on Building Science. You may know it better as Building Science Summer Camp, since that's what everyone calls it. I'll fill you in on what you missed if you weren't there.

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Image Credits:

  1. Energy Vanguard
  2. Texas A&M, Professor Charles Culp
  3. Thomas Battoe
  4. Mike MacFarland

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How to Install Flex Duct Properly

Following the Air Diffusion Council's standards would lead to better installations

Posted on Mar 13 2013 by Allison A. Bailes III, PhD

I've written a lot about duct problems (especially those in flex duct) because they're so abundant. A couple of years ago, I even wrote an article in the Energy Vanguard Blog about whether or not flex duct should be banned. My answer was no — but that we need better quality control.

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Image Credits:

  1. Energy Vanguard
  2. Air Diffusion Council
  3. Robert Bean

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When Do I Need to Perform a Load Calculation?

Part 4 in a series of articles on sizing heating and cooling equipment

Posted on May 11 2012 by Martin Holladay

In my last three blogs, I discussed the basics of heat-loss and cooling load calculations. The unfortunate truth about these calculations is that fast methods aren’t particularly accurate, and accurate methods require making measurements, checking specifications, and entering data into a computer program — in other words, a significant investment of time.

So how should builders go about making these calculations?

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Image Credits:

  1. Fine Homebuilding
  2. Martin Holladay

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Saving Energy With Manual J and Manual D

Experts tell builders that HVAC equipment and ducts should be designed according to Manual J and Manual D; the problem is, no one wants to do the calculations

Posted on Aug 13 2010 by Martin Holladay

If you’ve been paying attention to energy-efficiency experts and green-building Web sites, you probably know that it’s important to properly size your HVAC(Heating, ventilation, and air conditioning). Collectively, the mechanical systems that heat, ventilate, and cool a building. equipment. Most sources repeat the same advice: oversized furnaces and air conditioners cost too much, waste energy, and sometimes provide lower levels of comfort.

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Image Credits:

  1. Florida Solar Energy Study

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Duct Leakage Testing

For an energy-efficient forced-air system, seal seams with mastic and test with a Duct Blaster

Posted on Feb 19 2010 by Martin Holladay

For years, Americans who would never put up with leaky plumbing pipes have been willing to accept leaky ducts. While water damage is hard to ignore, the damage caused by leaky ducts is more subtle. Yet leaky ducts not only waste huge amounts of energy — they can also lead to comfort complaints, moisture problems, mold, and rot.

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Image Credits:

  1. Residential Energy Builders Guide, University of Kentucky
  2. Florida Solar Energy Center

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Not all duct design manuals are created green

Posted on Sep 30 2008 by Michael Chandler

Manual D is about comfort, not energy efficiency. Its requirement in LEEDLeadership in Energy and Environmental Design. LEED for Homes is the residential green building program from the United States Green Building Council (USGBC). While this program is primarily designed for and applicable to new home projects, major gut rehabs can qualify. -H makes green certification too expensive to justify the benefit.

I've been building solar and green for 30 years. I have built homes that Energy StarLabeling system sponsored by the Environmental Protection Agency and the US Department of Energy for labeling the most energy-efficient products on the market; applies to a wide range of products, from computers and office equipment to refrigerators and air conditioners. certify at 76% more efficient than code and score gold on our North Carolina Green Building Program as well as NAHB’s green building program, but I have never built a house that would qualify for even basic LEED-H certification. It doesn't seem likely that I will unless

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