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Applying condensing-temperature control in air-cooled reciprocating water chillers for energy efficiency

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  • Chan, K. T.
  • Yu, F. W.

Abstract

This paper reports on the modelling and findings of the energy performance of an air-cooled reciprocating multiple-chiller plant under the conventional head pressure control and the new condensing-temperature control in a subtropical climate. The simulation model was validated using the operating data of an existing chiller plant. As noted from this existing air-cooled reciprocating chiller plant, there was a substantial efficiency drop at part-load resulting from the head pressure control. If operating at variable lower condensing-temperatures based on the established operating mode of the condenser fans and compressors, it is shown that the chiller consumption can be maintained below 2 kW/refrigeration ton throughout the entire range of outdoor temperature and part-load conditions, giving an average efficiency of 1.08 kW/refrigeration ton. The energy imposition due to cycling on more condenser fans can be compensated by the reduced compressor consumption. Potential energy savings of 18.2 and 29% in the annual chiller consumption are achievable by applying the condensing-temperature control to two existing chiller plants studied. This supports the need to develop the condensing-temperature control as an improvement to the conventional head pressure control.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:72:y:2002:i:3-4:p:565-581
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    References listed on IDEAS

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    1. Lee, W. L. & Yik, F. W. H. & Jones, P. & Burnett, J., 2001. "Energy saving by realistic design data for commercial buildings in Hong Kong," Applied Energy, Elsevier, vol. 70(1), pages 59-75, September.
    2. Chan, K. T. & Chow, W. K., 1998. "Energy impact of commercial-building envelopes in the sub-tropical climate," Applied Energy, Elsevier, vol. 60(1), pages 21-39, May.
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    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. 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.
    3. Lee, W.L. & Lee, S.H., 2007. "Developing a simplified model for evaluating chiller-system configurations," Applied Energy, Elsevier, vol. 84(3), pages 290-306, March.
    4. Wang, Enhua & Yu, Zhibin, 2016. "A numerical analysis of a composition-adjustable Kalina cycle power plant for power generation from low-temperature geothermal sources," Applied Energy, Elsevier, vol. 180(C), pages 834-848.
    5. 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.
    6. Chan, Wai Mun & Leong, Yik Teeng & Foo, Ji Jinn & Chew, Irene Mei Leng, 2017. "Synthesis of energy efficient chilled and cooling water network by integrating waste heat recovery refrigeration system," Energy, Elsevier, vol. 141(C), pages 1555-1568.
    7. Wang, Shengwei & Cui, Jingtan, 2005. "Sensor-fault detection, diagnosis and estimation for centrifugal chiller systems using principal-component analysis method," Applied Energy, Elsevier, vol. 82(3), pages 197-213, November.
    8. Serafín Alonso & Antonio Morán & Miguel Ángel Prada & Perfecto Reguera & Juan José Fuertes & Manuel Domínguez, 2019. "A Data-Driven Approach for Enhancing the Efficiency in Chiller Plants: A Hospital Case Study," Energies, MDPI, vol. 12(5), pages 1-28, March.
    9. 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.
    10. Yu, F.W. & Chan, K.T., 2005. "Experimental determination of the energy efficiency of an air-cooled chiller under part load conditions," Energy, Elsevier, vol. 30(10), pages 1747-1758.

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