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Research on operating characteristics of direct-return chilled water system controlled by variable temperature difference

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  • Liu, Xue-feng
  • Liu, Jin-ping
  • Lu, Ji-dong
  • Liu, Lei
  • Zou, Wei

Abstract

Terminal load distribution and pipe network structure are the key factors that affect the energy-saving potential of central air-conditioning chilled water systems, nonlinear thermodynamic performance of an air-conditioning system with large inertia will mainly exert influence on the stability and reliability of energy-saving operation control. Unreasonable variable flow control strategy can neither achieve an ideal energy-saving effect nor meet the air-conditioning comfortableness requirements. With a direct-return chilled water system as study object, this paper built a hydraulic calculation model of pipe network topology, bypass loop hydraulic calculation model, AHU thermodynamic model, and water pump variable frequency operation model. Operating frequency of a water pump for different flow ratio, pump power, temperature difference of pipe network supply and return water, pressure difference of pipe network supply and return water, bypass control valve characteristics, system adjustability coefficient, and pipe network resistance characteristics of a chilled water system are studied under the condition of given supply water temperature, and pipe network’s AHU node thermal and humid load. And energy consumption characteristics of constant temperature difference control and variable temperature difference control are also analyzed with comparison. The results can provide theoretical guidance for the stable and reliable energy-saving operation of a chilled water system.

Suggested Citation

  • Liu, Xue-feng & Liu, Jin-ping & Lu, Ji-dong & Liu, Lei & Zou, Wei, 2012. "Research on operating characteristics of direct-return chilled water system controlled by variable temperature difference," Energy, Elsevier, vol. 40(1), pages 236-249.
    • Handle: RePEc:eee:energy:v:40:y:2012:i:1:p:236-249
    DOI: 10.1016/j.energy.2012.01.076
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    References listed on IDEAS

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    1. Ma, Zhenjun & Wang, Shengwei & Xiao, Fu, 2009. "Online performance evaluation of alternative control strategies for building cooling water systems prior to in situ implementation," Applied Energy, Elsevier, vol. 86(5), pages 712-721, May.
    2. Chang, Yung-Chung & Chen, Wu-Hsing, 2009. "Optimal chilled water temperature calculation of multiple chiller systems using Hopfield neural network for saving energy," Energy, Elsevier, vol. 34(4), pages 448-456.
    3. Yu, F.W. & Chan, K.T., 2008. "Optimization of water-cooled chiller system with load-based speed control," Applied Energy, Elsevier, vol. 85(10), pages 931-950, October.
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    Cited by:

    1. Edwards, K.C. & Finn, D.P., 2015. "Generalised water flow rate control strategy for optimal part load operation of ground source heat pump systems," Applied Energy, Elsevier, vol. 150(C), pages 50-60.
    2. Xuefeng, Liu & Jinping, Liu & Zhitao, Lu & Kongzu, Xing & Yuebang, Mai, 2015. "Diversity of energy-saving control strategy for a parallel chilled water pump based on variable differential pressure control in an air-conditioning system," Energy, Elsevier, vol. 88(C), pages 718-733.
    3. Jing Zhao & Yu Shan, 2020. "A Fuzzy Control Strategy Using the Load Forecast for Air Conditioning System," Energies, MDPI, vol. 13(3), pages 1-17, January.
    4. Shunian Qiu & Zhenhai Li & Delong Wang & Zhengwei Li & Yinying Tao, 2022. "Active Optimization of Chilled Water Pump Running Number: Engineering Practice Validation," Sustainability, MDPI, vol. 15(1), pages 1-12, December.

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