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Check out the latest issue of RSES Journal for features including: Outdoor Air Dilution to Mitigate COVID-19 Spread, Wet Bulb Temperature Part 2: Were the Specs Wrong? and more. All inside your August 2020 RSES Journal issue.



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Understanding Radiant Systems

Understanding Radiant Systems


COVID-19 Update

Beginning June 1, 2020, per the five-phase plan to re-open Illinois issued by Governor Pritzker, RSES Headquarters staff has returned to the office during regular business hours of 8:30 am – 5:00 pm (CST), Monday through Friday. 

We will be taking every precaution to ensure our safety, but we’ll be onsite to answer your phone calls and emails more promptly! You call us at 847/297-6464 or email us at
Thank you for your understanding and patience during this unusual time. We so much look forward to getting back into the office to better serve you!

Please know, we will maintain the free resources page created during this time to continue to support remote education. Visit often, as the page will be frequently updated: RSES COVID-19 RESOURCE PAGE.

Society & Industry News

Outdoor Air Dilution to Mitigate COVID-19 Spread

As the fall season approaches and COVID-19 continues to affect the U.S., facility managers, consulting engineers and HVACR contractors are taking a harder look at how to keep buildings safe as their occupancies rise; and reopen those that have been closed for months, such as education facilities.

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What Wet Bulb Wet Bulb Wet Bulb Temperature Temperature Tells Us— Part 2

This three-part series will dive into the specifics of wet bulb temperatures, what they indicate and some foundational details about psychrometrics.

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Part 2: EC Indoor Blower Motors, Resistance Is Futile

A common misconception about EC indoor blower motors is that they all maintain airflow and solve airflow issues such as undersized ductwork and/ or dirt load on the air side components. In part one of this article (see June 2020 issue of RSES Journal), I explained that there are actually two different types of EC indoor blower motors, constant airflow and constant torque.

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Making the Humidity Case (Study)

Based on gathered research, which will be presented in this article, there is a demonstrable link between humidity and the infectivity and longevity of a variety of viruses. Th e research demonstrates that at Relative Humidity (RH) levels, between 40%–50%, many types of common and harmful viruses such as influenza and coronaviruses are rendered inert much more quickly than at RH levels of =20%.

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What Wet Bulb Temperature Tells Us -- Part 1

It is commonly stated that wet bulb temperature indicates the moisture content of the air. Moisture content of air is called humidity ratio or specific humidity and is measured in pounds of water in a pound of dry air.

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Beginning with basic theory and extending to complex troubleshooting, training courses covering refrigeration and air conditioning, heating, electricity, controls, heat pumps and safety may be conducted in a classroom environment or though self study. RSES publications may be purchased by schools, contractors, manufacturers or any other industry group wanting to conduct comprehensive training programs. Seminars covering air conditioning troubleshooting, electrical troubleshooting, compressor training, condenser training, refrigerant piping practices, DDC controls, and more are held in various cities across North America.

Select training programs offer Continuing Education Units (CEUs) and NATE Continuing Education Hours (CEHs).

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