Impacts of Balancing Valves on Pump Energy and Control Performance in Variable Water Flow Systems

[+] Author and Article Information
B. Zheng, M. Liu

Energy Systems Laboratory, University of Nebraska-Lincoln, Omaha, NE 68182

J. Sol. Energy Eng 128(3), 414-417 (Jul 30, 2005) (4 pages) doi:10.1115/1.2189862 History: Received April 28, 2004; Revised July 30, 2005

There is no common agreement on the use of balance valves in the most popular variable water flow systems. A comprehensive theoretical analysis has been conducted to investigate the impacts of balance valves on initial cost, pump operation power, and system control performance. The investigation finds that eliminating balance valves can (i) reduce by 20–40% pump energy consumption in a typical variable flow water system, (ii) reduce the maximum pressure drop across control valves, and (iii) improve pump efficiency at most partial load conditions. The reduced pressure drops across control valves improve system control performance and may allow selecting some control valves at lower close-off pressures. Consequently, eliminating balancing valves can also potentially reduce system initial cost.

Copyright © 2006 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Schematic of VFD Hydraulic system

Grahic Jump Location
Figure 2

Schematic diagram of the water loops: (a) option 1 and (b) option 2

Grahic Jump Location
Figure 3

Simulated optimal pump head and design system curve (branch 2 water flow: 40%)

Grahic Jump Location
Figure 4

Simulated potential pump power savings as the ratio of option 1 (branch 2 water flow: 40%)

Grahic Jump Location
Figure 5

Simulated system maximum differential pressure of control valves (branch 2 water flow: 40%)

Grahic Jump Location
Figure 6

Control valve maximum pressure drop cumulative distribution




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In