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Formulation of Coefficient of Performance Characteristics of Water-cooled Chillers and Evaluation of Composite COP for Combined Chillers

Author

Listed:
  • Toru Yamamoto

    (Intee Corporation, 2–14 Nihonbashi 3 Chome, Chuoku, Tokyo 103–0027, Japan)

  • Hirofumi Hayama

    (Division of Human Environmental System, Faculty of Engineering, Hokkaido University, N13-W8, Kita-ku, Sapporo 060–8628, Japan)

  • Takao Hayashi

    (Hirosawa Electric Corporation, 2–13–14 Nishikoujiya, Ohtaku, Tokyo 144–0034, Japan)

Abstract

The Coefficient of Performance of an ordinary water-cooled chiller is presented as a relationship with the chiller load factor and cooling water temperature. However, the cooling water temperature fluctuates according to the processed heat of the cooling tower originating in the cooling energy of the chiller and to the outside temperature and humidity. It is therefore difficult to obtain the cooling water temperature under the processed-heat and weather conditions at the time of evaluation. This, in turn, makes it difficult to determine the Coefficient of Performance of a water-cooled chiller at the evaluation time. In this research, we formulated the Coefficient of Performance of a water-cooled chiller as a relationship with the chiller load factor and specific enthalpy of outside air. Specifically, we used the Number of Transfer Units (NTU) model of a cooling tower to calculate the cooling water temperature corresponding to the cooling-tower load factor targeting a counterflow cooling tower for a range of values of outside-air specific enthalpy. This technique makes it possible to evaluate the Coefficient of Performance of a water-cooled chiller without determining the cooling water temperature. Furthermore, for the case of installing multiple units of chillers, it becomes possible to calculate the composite Coefficient of Performance of those chillers without having to determine the cooling water temperatures for the different operation load factors of those chillers. Moreover, since the composite Coefficient of Performance can be calculated by combining the different installation capacities of these chillers, the energy consumption of multiple chillers can be calculated at the basic planning stage.

Suggested Citation

  • Toru Yamamoto & Hirofumi Hayama & Takao Hayashi, 2020. "Formulation of Coefficient of Performance Characteristics of Water-cooled Chillers and Evaluation of Composite COP for Combined Chillers," Energies, MDPI, vol. 13(5), pages 1-20, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:5:p:1182-:d:328481
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    References listed on IDEAS

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    1. Clemente García Cutillas & Javier Ruiz Ramírez & Manuel Lucas Miralles, 2017. "Optimum Design and Operation of an HVAC Cooling Tower for Energy and Water Conservation," Energies, MDPI, vol. 10(3), pages 1-27, March.
    2. Karl-Kiên Cao & Kai von Krbek & Manuel Wetzel & Felix Cebulla & Sebastian Schreck, 2019. "Classification and Evaluation of Concepts for Improving the Performance of Applied Energy System Optimization Models," Energies, MDPI, vol. 12(24), pages 1-51, December.
    3. Javier M. Rey-Hernández & Eloy Velasco-Gómez & Julio F. San José-Alonso & Ana Tejero-González & Sergio L. González-González & Francisco J. Rey-Martínez, 2018. "Monitoring Data Study of the Performance of Renewable Energy Systems in a Near Zero Energy Building in Spain: A Case Study," Energies, MDPI, vol. 11(11), pages 1-17, November.
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    Cited by:

    1. Hong-Hai Niu & Yang Zhao & Shang-Shang Wei & Yi-Guo Li, 2021. "A Variable Performance Parameters Temperature–Flowrate Scheduling Model for Integrated Energy Systems," Energies, MDPI, vol. 14(17), pages 1-25, August.
    2. Toru Yamamoto & Hirofumi Hayama & Takao Hayashi & Taro Mori, 2020. "Automatic Energy-Saving Operations System Using Robotic Process Automation," Energies, MDPI, vol. 13(9), pages 1-14, May.

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