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Aug 2020
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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Aug 2020
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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Aug 2020
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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Aug 2020
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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Aug 2020
Last Word: The Resilience of the HVACR Industry
In my last couple of columns, I discussed not just the ingenuity of the HVACR industry but also our ability to weather any storms that may come our way. Now, many months into the COVID-19 pandemic that has swept the world, we are truly starting to see that in action.
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Aug 2020
Leading Off: The Dog Days of Summer
By the time you read this much of the nation will be in what we in the South call the “Dog Days,” which is a period of the summer that is characterized by oppressive heat and humidity. These high-humidity ambient conditions can create unusually high latent loads, so many of our HVAC systems are unable to achieve comfortable indoor high moisture levels.
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Aug 2020
Troubleshooting: Temperature Spikes
The problem: temperature spikes in a low temp plasma freezer every six hours. On a call such as this, I request the trend log data from the monitoring system so I can look for patterns and I strongly suggest anyone with access to these types of metrics use it to their advantage.
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Jul 2020
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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Jul 2020
Under the UV Influence
UV disinfection continues to emerge as a popular virus pandemic defense; learn how it’s being utilized and installation and marketing guidelines.
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Jul 2020
Retrofit for Sustainable Supermarket Refrigeration
Perhaps more than any time in history, supermarket operators are re-evaluating their legacy refrigeration systems. Retail market drivers—including regulatory mandates, sustainability objectives and the emergence of e-commerce fulfillment models—are dictating changes to refrigeration architectures.
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RSES is the leading education, training and certification preparation organization for HVACR professionals. RSES publishes various comprehensive industry training and reference materials in addition to delivering superior educational programs designed to benefit HVACR professionals at every stage of their careers through instructor-led training courses, online training for HVAC, educational seminars, interactive CD and DVD products, industry-related reference manuals, and helpful technical content through Service Application Manual chapters, the RSES Journal, the RSES Journal archives and feature articles, as well as web-exclusive features.
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).
In addition, RSES offers industry certification preparation materials for refrigerant handling (EPA Section 608), R-410A and North American Technician Excellence (NATE) examinations.
RSES’ monthly magazine, RSES Journal, serves HVAC contractors, service technicians, students, operations/maintenance managers, engineers and technicians who work in the residential, light commercial, commercial and institutional markets on air conditioning, warm-air heating, refrigeration, ventilation, electrical, ice machines, chillers, hydronic heating, piping, refrigeration control and energy management, building automation, indoor air quality and duct cleaning, and sheet metal fabrication equipment and/or systems.
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