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Charlotte Pipe and Foundry Co.
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Charlotte Pipe and Foundry
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Screenshot 2023 10 30 125004
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HPAC Engineering
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Istockphoto 1235495974 612x612
Istockphoto 1235495974 612x612

Primary/Secondary vs. Primary-Only Pumping

April 1, 2011
Modeled performance of one- and five-chiller/tower plants

In 1996, an article in this magazine1 sparked debate of the merits of primary/secondary (P/S) vs. primary-only (P-only) pumping of distribution water in central chiller plants. The consensus of numerous articles published since is that P-only pumping has plant kilowatt-demand advantages over P/S pumping, especially if low-load delta-T exists. This article is the first in a series using a chiller-plant model2 to study the effect of the two pumping approaches on total plant kilowatt demand. The model adheres to the fundamental principal of the first law of thermodynamics.3

Click here to view a PDF of the article