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Energy use characteristics of variable primary flow chilled water pumping systems.

Author(s) : BAHNFLETH W. P., PEYER E. B.

Summary

The use of variable primary flow pumping in chilled water systems is increasing due to its perceived potential to reduce energy consumption and initial cost. Neither the conditions under which significant energy savings are realized nor the likely magnitude of savings are well documented. To address this deficiency, a program of simulations was conducted that compared variable primary flow system energy use with that of other common system types. Parameters varied included load type, number of chillers in the central plant, temperature difference vs. part load characteristics, and climate. Results of these simulations show that for systems without temperature differential problems substantial reductions in chilled water pumping energy are possible. However, this benefit decreases as the number of chillers increases. The reduction in annual pumping energy due to variable primary flow is generally between 25 and 50%. Relative to total plant energy use, this is a reduction of 2 to 5%.

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Details

  • Original title: Energy use characteristics of variable primary flow chilled water pumping systems.
  • Record ID : 2004-2211
  • Languages: English
  • Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Publication date: 2003/08/17

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