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Hydraulics, Pipe Flow, Industrial HVAC & Utility Systems: Mister Mech Mentor, Vol. 1

By
James A. Wingate
James A. Wingate
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ISBN-10:
0791802353
No. of Pages:
156
Publisher:
ASME Press
Publication date:
2005

Modern packaged water chillers come equipped with a variety of talented microprocessor and/or PC-based internal controllers and system controls, which can be interfaced with building automation systems and other networks quite easily.

These controls, in conjunction with modern, throttleable-by-inlet-vane-or-other-means refrigerant compressors (or their equivalent) such as the high-efficiency centrifugals, scroll-types and screw machines, make something not only possible but easy and relatively efficient, which was previously difficult and risky: operation at a heat transfer rate much smaller than the chiller's maximum capacity.

Commonly called “turndown,” or “part-load operation”, the ability of a chiller to run continuously at only a small...

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