Articles by Stephen Hamstra P.E., ASHRAE HBDP LEED AP,

Pumping and Flow Controls in Geothermal Heat Pump Systems

By Stephen Hamstra P.E., ASHRAE HBDP LEED AP,
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What are the key technical challenges and design options for optimizing a geothermal heat pump design? Review the pros and cons involved with centralized or distributed pumping, with hybrid or decoupled systems, and with the controls that can guide them.
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Large Scale Geothermal Heat Pump Systems

By Stephen Hamstra P.E., ASHRAE HBDP LEED AP,
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With the help of advances in intelligent controls and a shift in design mindset, these systems can steer buildings toward smaller equipment sizes and associated savings. Review three projects and consider the benefits of keeping an upcoming project in the loop.
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"V" is for Ventilation

By Stephen Hamstra P.E., ASHRAE HBDP LEED AP,
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And “M” is for “More than one way to get the job done.” In this two-school tour, we start with an underfloor ventilation design and geothermal energy center in action. Then we take notes at a school with displacement ventilation, radiant floor heating, and radiant ceiling cooling. Round out the lesson with discussion of ASHRAE 62.1-2007 guidelines and the Wells-Riley equation for infection and ventilation, and your next school project is practically getting smarter already.
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ES Gallery: Snapshots & Systems

Check out highlights from projects featured in our magazine this year!
9/25/14 2:00 pm EDT

Test Anxiety? Learn How and When to Test Your Standby Generator

This webinar will discuss generator reliability, testing, and troubleshooting from a practical perspective and make recommendations for a comprehensive inspection and testing program.

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2014 September

Check out the September 2014 issue of Engineered Systems, with features on radiant panels, refrigerant flow systems, and much more!

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The Green Energy Management Book

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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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