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

Burd, Alexander L.; Burd, Galina S.
December 2010
Heating/Piping/Air Conditioning Engineering;Dec2010, Vol. 82 Issue 12, p36
The article presents a comparison of the operational modes and performance of primary/secondary (P/S) loop and primary-loop-only-variable-flow (PLOVF) control system. It states that (P/S) loop uses a qualitative and quantitative control strategy, while (PLOVF) control system employs a single pump to circulate water through generation-and distribution-system piping loops. It notes P/S-loop systems with variable flow have advantage in stable control and operational conditions.


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