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Steven Welty LEED® ap,

Welty is a specialist in airborne and infectious diseases and HVAC energy efficiency and president of Green Clean Air (Reston, VA). He uses computer modeling to design airborne infection control systems using UV light and MERV filters. Reach him by e-mail at


Solving Indoor Airborne Disease Transmission Problems

August 1, 2011
The author describes how toilet flushes aerosolize germs sending them airborne to soar around and infect their next victim(s) because bathrooms are designed backwards. Learn novel ways to control and clean bathroom air to help control airborne disease transmission problems. So feel free to hold your nose as you learn about how you can help protect people’s health within your client’s buildings.
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Taking Notes: Desiccant Dehumidification

June 1, 2011
Whether your client has a school or office building, desiccant dehumidification can successfully control the project’s humidity, save energy, and remove pollutants. This primer empowers you to teach your clients how desiccants work, while other tips and applications can help your future projects more than make the grade.
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Liquid Desiccant Dehumidification

May 1, 2010
While their dry counterparts are an HVAC industry standard, liquid desiccant dehumidification (LDD) systems have been common only in industrial applications. Small units have produced very impressive EER and COP results, yet only a handful are installed in commercial applications. While companies touting their “new” LDD systems have come and gone, there’s a new generation of LDD commercial technologies in town. How will these “new and improved” LDD systems perform in terms of humidity control, energy, IAQ, and occupant health and comfort? Is now finally the time when they can revolutionize both humidity control and heat recovery to become the new, healthy, energy efficiency magic potion?
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SAVE LIVES: Become A Mechanical Engineer

February 1, 2010
OK, the author knows that’s not what the college recruiting brochures said back when you attended your bastion of higher learning, but that may change very soon. There is enough solid science available to back up the claims that controlling IAQ can, in fact, save lives. We focus on the airborne germ du jour - influenza - in order to illustrate how your decisions on controlling the indoor air in your clients’ buildings can be critical to health and life preservation.
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How Humidification Affects Health, Mold and Airborne Germs

February 1, 2010
If you were a mold spore, your mantra might be, “Surface moisture: can live with it, can’t live without it.” If you were a bacteria or virus, it would be just the opposite - they love low-humidity ambient conditions. Read on for insights into condensate prevention on cooler surfaces, hospital humidification standards here and abroad, and avoiding a recipe for mold soup.
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ES Gallery: Snapshots & Systems

Check out highlights from projects featured in our magazine this year!
3/27/14 11:00 am EST

How to Calculate Backup Power Supply Requirements for Your Facility

On-Demand This webinar reviews how to determine power requirements of facility loads; electrical characteristics and impact of different types of loads such as large motors and UPS systems on power supply sizing; acceptable power sources and other constraints applied by building codes; and how software tools can be used to simplify the process of calculating backup power requirements.  


Engineered Systems Magazine

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2014 April

Check out the April 2014 issue of Engineered Systems, with features on backup power supply requirements, cyberattacks, and much more!

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Design Flaws

Following up on Howard McKew's April "Tomorrow's Environment" column: Have you ever thought twice about reporting problems with another firm's design? What did you do?
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The Green Energy Management Book

Learn from our experts how to evaluate job opportunities, market your services, sell a Walk-through Survey, target areas for an Energy Audit, calculate energy savings, do retrofit work, and win continuing contracts for retrofit work.

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Tomorrow's Environment Podcast

This series from longtime columnist and chronic forward-thinker Howard McKew covers a lot of ground -- from retrocommissioning to systems training, on toward checklists for drawings and tips for meeting minutes. Click HERE to be taken to the podcast page!


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