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Stanley A. Mumma PH.D., P

Mumma is an ASHRAE fellow and a professor of architectural engineering at Penn State University. Write him at or visit


Terminal Equipment With DOAS: Series vs. Parallel

While there’s no disagreement that DOAS systems require some supplemental equipment to handle remaining sensible cooling loads, a couple of schools of thought have evolved regarding the best way to arrange certain terminal equipment within the overall system. Can this be a simple misunderstanding about one option’s ideal configuration? Can a 2,700% difference in power consumption really be a part of this discussion? Read on to find out.

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Web Exclusive: DOAS & Desiccants

This pairing can represent a great strategy - if you choose your tactics wisely. When is passive or active the better desiccant approach? When is one out of the question? We'll discuss how to control the latent load, arrive at a smart design decision for the circumstance, and consider recent research on first cost and performance.

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DOAS and Homeland Security

In the event of a bioterrorist attack, would having a VAV or DOAS system make a difference? Would one system or another make a difference in the speed of flushing out the contaminant? Or in spreading contaminant through various spaces? Or does filtration selection come into play, too? The correct answer is yes, yes, yes, and yes.
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ES Gallery: Snapshots & Systems

Check out highlights from projects featured in our magazine this year!
5/13/15 11:00 am EDT

When's & Why's of Fuel Options and Selection for Backup Power

ON DEMAND This presentation will bring listeners up to speed on what the best options are today and in the near future. 

Engineered Systems Magazine


2015 May

Check out the May issue of ES with the cover story: VRF with Heat Recovery Ventilation In PreK-12 Schools.

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System Design

Based on your experience and knowledge level, are you currently comfortable designing or maintaining a system incorporating VRF or radiant ceiling panels?
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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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Clear Seas Research

With access to over one million professionals and more than 60 industry-specific publications, Clear Seas Research offers relevant insights from those who know your industry best. Let us customize a market research solution that exceeds your marketing goals.

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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