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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 sam11@psu.edu or visit http://doas-radiant.psu.edu.

ARTICLES

Terminal Equipment With DOAS: Series vs. Parallel

May 1, 2008
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

August 1, 2007
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

January 1, 2007
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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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.  

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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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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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