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Feature Article

Fight The Freeze

by Scott A. Futrell P.E., SET


Interconnection Of Chilled Water Plants

What determines chiller plant loading? Do connected plants need to use similar pumping schemes? Is it better to run one chiller in multiple plants or multiple chillers in one plant? Draw on the author’s experience for answers. Then learn how to handle the hydraulics of interconnection and enjoy the byproducts of a well-integrated system.


by Gary R. Davies P.E.


Overcoming Hot Aisle / Cold Aisle Separation Anxiety

Here in the second of two parts, the author is reminded that data center design is no vacation. He does, however, discover that what doesn’t work on the road to Orlando doesn’t work in the data cen-ter, either. What to do? Truly isolating the heat at its origin and backing around to a classic VAV pressure reset strategy eventually yielded a cool solution for everyone not working in the hot aisle.


by Kevin Dickens, P.E.


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.


by Stanley A. Mumma , PH.D., P.E.









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