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• Wire-to-shaft efficiency for HVAC pumps: designers need to have a way to compute part-load energy consumption scenarios. However, the data aren't always available. Here, we look at why some good math is worth the effort 

  [ILLUSTRATION OMITTED] [ILLUSTRATION OMITTED] Wire-to-shaft efficiency for variable-speed centrifugal pumps defines the percentage of power...

  Engineered Systems, 12/01/08 by James "Burt" B. Rishel · More from publication

• Connecting buildings to central chilled water plants 

  [ILLUSTRATION OMITTED] [ILLUSTRATION OMITTED] The desire to save energy and eliminate costly piping has necessitated that we ensure that the...

  ASHRAE Journal, 11/01/07 by James B. Rishel · More from publication

• How to calculate motor efficiency for variable-speed centrifugal pumps: knowing the efficiencies of the pump, VSD, and motor will enable the engineer to calculate the kW input for a pump, from minimum to maximum flow and head conditions for that pump. Her 

  The calculation of the motor efficiency for a variable-speed centrifugal pump can be complicated and requires first the determination of the pump...

  Engineered Systems, 08/01/03 by James B. Rishel · More from publication

• Is your chilled water plant ready for adaptive control? 

  From managing variable-speed pumps to sequencing chillers to adjusting to fluctuations in return water temperature, adaptive control might be the...

  Engineered Systems, 02/01/03 by James B. Rishel · More from publication