Variable Water Flow Pumping for Central Chilled Water Systems

[+] Author and Article Information
M. Liu

Architectural Engineering, University of Nebraska, 1110 South 67th Street, Omaha, NE 68182-0681e-mail: mliu2@unl.edu

J. Sol. Energy Eng 124(3), 300-304 (Aug 01, 2002) (5 pages) doi:10.1115/1.1488667 History: Received June 01, 2001; Revised March 01, 2002; Online August 01, 2002
Copyright © 2002 by ASME
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Song, D., Liu, L., Turner, W, D., and Batten, T., 2000, “Continuous Commissioning of a Central Chilled Water and Hot Water Systems,” Proc. of 12th Symp. on Improving Building Systems in Hot and Humid Climates, May 15–17, San Antonio, TX.
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Kaul, M. P., Kedzierski, M. A., and Dldion, D. A., 1996, “Horizontal Flow Boiling of Alternative Refrigerants Within a Fluid Heated Micro-fin Tube,” Proc. of Process, Enhanced, and Multiphase Heat Transfer, Atlanta, GA.


Grahic Jump Location
Simulated ratio of the heat transfer temperature difference to its design value
Grahic Jump Location
Simulated evaporative temperature under different approaching temperature difference (εd) (Dashed line is for the VW system. Solid line is for the PS systems.)
Grahic Jump Location
Schematic of the primary secondary chilled water pumping systems
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Schematic of variable water flow (VW) systems (Push through is recommended for new system designs. Draw through is recommended for existing system retrofits.)
Grahic Jump Location
Simulated pump energy savings ratio versus the water flow ratio (Assuming three identical chiller systems)
Grahic Jump Location
Simulated Reynolds Number and ratio of the in-tube convective heat transfer coefficient (Solid line is for the ratio of the convective heat transfer coefficient. The dash line is for Reynolds number)
Grahic Jump Location
Simulated ratio of overall heat transfer coefficient for different design overall heat transfer coefficients




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