Primary/Secondary-Loop vs. Primary-Loop-Only Systems

Primary/Secondary-Loop vs. Primary-Loop-Only Systems

Comparison of operational modes and performance of two schemes for optimizing chilled-water plants

Subdividing various systems into a primary/secondary (P/S) loop via a hydraulically dependant interconnection long has been a standard solution for central chilled-water plants in the United States and Europe. This achieves, at a relatively low cost, reasonably good hydraulic separation of central-water-plant cooling-generation systems (primary loop) from distribution piping and terminal units (secondary loop). Primary-loop flow is relatively constant, while secondary-loop flow varies based o

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