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Healthy HVAC Design Primer for Residential Building Professionals, Wednesday, September 9, 2020
Event Description
Join Allison Bailes III, PhD, for a full day session to learn about healthy residential HVAC design.
You will be able to explain healthy home principles and how they are achieved through HVAC recommendations found in ACCA Manuals J, S, D and T. Calculate room-by-room heating and cooling loads for homes and describe how homes can be divided into zones to efficiently meet heating and cooling needs. Use heating and cooling load calculations to make residential heating and cooling equipment choices and sizing decisions. Reference and comply with ACCA Manuals J and S procedures for single and multiple zone systems. Consider air resistance in ducts and fittings, and get tips on sizing registers and grilles.
Healthy homes principles
Residential HVAC design protocols: ACCA Manuals J, S, D, and T
Manual J overview
What is heat?
Principles of heat transfer
Sensible and latent heat
Heat transfer equations
Calculating Room-by-Room Heating & Cooling Loads
Indoor and outdoor design conditions
The health impacts of relative humidity
Unconditioned and conditioned spaces
Dividing the house into zones
Building enclosure details
Internal loads
Understanding Heating and Cooling Load Calculation Results
Residential heating and cooling equipment choices
Manual S overview for forced air heating and cooling equipment
Selecting cooling equipment – air conditioner or heat pump
Sizing systems and using variable capacity systems
Getting the right air flow
Using manufacturers’ expanded performance data
Selecting a Furnace
Balance point and supplemental heat for heat pumps
Review of Manual J and Manual S Procedures
Manual D overview
Single and multiple zone systems
Laying out the duct system for healthy air flow
Static pressure and velocity pressure
Total external static pressure
Available static pressure
Air Resistance in Ducts and Fittings
Equivalent length of fittings
Total effective length of the critical path
Friction rate
The effect of air velocity
Manual T Overview
Sizing registers and grilles
Cleaning the air with high-MERV filters
Mechanical ventilation for a healthy home
Allison Bailes founded and runs Energy Vanguard, a small firm that does residential HVAC design, building science consulting, training and quality assurance. He also writes the Energy Vanguard Blog, which gets millions of views each year. Mr. Bailes has built a highperformance home out of structural insulated panels, run a home performance company and worked as regional manager for the EarthCraft House green building program. Having earned a PhD in Physics from the University of Florida, he has a strong background in the growing field of building science. He is on the board of directors for the Passive House Institute US (PHIUS), and he is a member of ASHRAE. Mr. Bailes is a juggler and a skier as well as having the honor of being the only man included in Who’s Who of American Women.
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