Allison A. Bailes III, PhD Archives

Allison A. Bailes III, PhD

Company name: Energy Vanguard, LLC

Position: Founder and President

Dr. Allison Bailes is a building science expert who has spoken at many conferences, written several informative articles on The Energy Vanguard Blog, and published a book, A House Needs to Breathe… Or Does It? He has received a formal education in physics and has taught that subject at the high school and college levels. Nowadays, he applies that subject knowledge to his personal areas of interest: high-performance and green buildings.

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Wet Bulb and Enthalpy – The Left Side of the Chart

It's incredibly useful to understand wet-bulb temperature and air enthalpy when calculating actual system capacity and human comfort. Dry-bulb temperature is a reading of the average molecular velocity of dry air. However, it does not account for the actual heat content of the air or the evaporative cooling effect of the air. When air is […]

High-Pressure vs. Low-Pressure Shell Scrolls: A Deeper Dive

I want to share something that came up in a recent discussion with Roman Baugh about VRF systems, and it made me realize I might have had a blind spot regarding scroll compressor designs. We were talking specifics, and he brought up high-pressure shell compressors. My immediate thought was, “Hold on, aren't scrolls low-pressure shell […]

Should the Float Switch Break R or Y?

There are three things we never discuss at the dinner table: religion, politics, and which wire to break with your float switch. A float switch fills with water whenever there is a drain backup, and it breaks power to one of the low-voltage wires. We clearly want the HVAC system to stop producing more condensate, […]

A Layered Approach to IAQ

Is Undersizing Really a Problem?

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A Layered Approach to Indoor Air Quality

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Dr. Allison Bailes Discusses His New Book

Do Houses Need to Breathe? w/ Allison Bailes

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ERVs – What You Need To Know w/ Dr. Bailes

In this episode of the HVAC School podcast, host Bryan sits down with building science expert Allison Bailes to dive deep into the world of Energy Recovery Ventilators (ERVs). The conversation explores the critical role of ventilation in modern homes, highlighting how ERVs have become an essential component of maintaining indoor air quality and […]

Proper Design For Ductless and Ducted HVAC Systems

In this podcast episode, Bryan, Chad, John, and Allison discuss proper design for ductless and ducted HVAC systems, especially mini-splits. They also discuss potential future improvements to equipment and duct designs. Mini-splits are smaller than traditional HVAC units, so they make zoning a bit easier. However, load calculation plays a huge role in equipment selection […]

Friction Rate and Duct Design w/ Dr. Bailes (Podcast)

This episode is very exciting to me because we get to have Dr. Allison Bailes on the show. Today, he shares his knowledge about friction rate and duct design. Allison got his start teaching college-level physics before getting into the building design industry. If you have a forced-air system that blows heated or cooled air […]