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Modelling of a condenser-fan control for an air-cooled centrifugal chiller

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  • Yu, F.W.
  • Chan, K.T.

Abstract

There is a lack of detailed experimental and simulation studies on air-cooled centrifugal chillers. This paper investigates how to optimize the control of condenser fans within the chillers to maximize their coefficients of performance (COPs). A thermodynamic model for the chillers was developed and used to analyse the steady-state COP under various load and ambient conditions. An algorithm is introduced to compute the number of staged condenser fans based on settings of the condensing pressure and outdoor temperature. The model was validated using the experimental data and performance data of an existing chiller running under various operating conditions. It is found that the best strategy for switching condenser fans is to vary their rotating speed by the use of a set point of the condensing temperature, which is adjusted in response to the chiller load and condenser air-inlet temperature. The results of this paper provide an important insight into how to increase the COPs of air-cooled chillers.

Suggested Citation

  • Yu, F.W. & Chan, K.T., 2007. "Modelling of a condenser-fan control for an air-cooled centrifugal chiller," Applied Energy, Elsevier, vol. 84(11), pages 1117-1135, November.
    • Handle: RePEc:eee:appene:v:84:y:2007:i:11:p:1117-1135
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    References listed on IDEAS

    as
    1. Yu, F.W. & Chan, K.T., 2006. "Improved condenser design and condenser-fan operation for air-cooled chillers," Applied Energy, Elsevier, vol. 83(6), pages 628-648, June.
    2. Chan, K.T. & Yu, F.W., 2006. "Thermodynamic-behaviour model for air-cooled screw chillers with a variable set-point condensing temperature," Applied Energy, Elsevier, vol. 83(3), pages 265-279, March.
    3. Chan, K. T. & Yu, F. W., 2002. "Applying condensing-temperature control in air-cooled reciprocating water chillers for energy efficiency," Applied Energy, Elsevier, vol. 72(3-4), pages 565-581, July.
    4. Unknown, 2005. "Forward," 2005 Conference: Slovenia in the EU - Challenges for Agriculture, Food Science and Rural Affairs, November 10-11, 2005, Moravske Toplice, Slovenia 183804, Slovenian Association of Agricultural Economists (DAES).
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    1. Yu, F.W. & Chan, K.T., 2010. "Simulation and electricity savings estimation of air-cooled centrifugal chiller system with mist pre-cooling," Applied Energy, Elsevier, vol. 87(4), pages 1198-1206, April.
    2. Jun Fan & Haotian Dong & Xiangyang Xu & De Teng & Bo Yan & Yuanbin Zhao, 2019. "Numerical Investigation on the Influence of Mechanical Draft Wet-Cooling Towers on the Cooling Performance of Air-Cooled Condenser with Complex Building Environment," Energies, MDPI, vol. 12(23), pages 1-16, November.
    3. Yang, L.J. & Wang, M.H. & Du, X.Z. & Yang, Y.P., 2012. "Trapezoidal array of air-cooled condensers to restrain the adverse impacts of ambient winds in a power plant," Applied Energy, Elsevier, vol. 99(C), pages 402-413.
    4. Yang, Tingting & Wang, Wei & Zeng, Deliang & Liu, Jizhen & Cui, Can, 2017. "Closed-loop optimization control on fan speed of air-cooled steam condenser units for energy saving and rapid load regulation," Energy, Elsevier, vol. 135(C), pages 394-404.
    5. Chen, Lei & Yang, Lijun & Du, Xiaoze & Yang, Yongping, 2016. "A novel layout of air-cooled condensers to improve thermo-flow performances," Applied Energy, Elsevier, vol. 165(C), pages 244-259.

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