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Development of Ultra-High-Efficiency Medium-Capacity Chillers with Two-Stage Compression and Interstage Vapor Injection Technologies

Author

Listed:
  • Zhiping Zhang

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
    Gree Electric Appliance Co., Ltd., Zhuhai 519070, China)

  • Hongye Qiu

    (College of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Dantong Li

    (College of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Zhilong He

    (College of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Ziwen Xing

    (College of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Lijian Wu

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

Chillers are widely used in commercial buildings for air conditioning, and their energy consumption is the main contribution to the building’s carbon emissions. Currently, the COPs of small- and medium-capacity screw chillers are still generally lower than 6.5, whereas large-capacity commercial centrifugal chillers have achieved an ultra-high energy-efficiency level of COP ≥ 7.0. To achieve an ultra-high energy efficiency of COP ≥ 6.5 in medium-capacity chillers, the authors developed a 200 RT screw chiller by adopting the technologies of two-stage compression and interstage vapor injection. The whole development process, including the design, simulation, analysis, and experiment, is presented in this paper. It was found that the two-stage compression technology could effectively boost the performance of the chiller’s compressor to a maximum volumetric and adiabatic efficiency of 99% and 80%, respectively. With the interstage vapor injection technology, the chiller’s cooling capacity and COP were increased by more than 11% and 8%, respectively. When the use of these two technologies was combined, the maximum COP of the chiller reached 7.17. Additionally, under these working conditions, the COP and integrated part-load value (IPLV) were 6.74 and 10.04, respectively. In all, the combination use of vapor injection and two-stage compression technologies shows great potential to improve the performance of chillers. The work and conclusions described here might provide an effective reference for the future development of high-efficiency small- and medium-capacity screw chillers.

Suggested Citation

  • Zhiping Zhang & Hongye Qiu & Dantong Li & Zhilong He & Ziwen Xing & Lijian Wu, 2022. "Development of Ultra-High-Efficiency Medium-Capacity Chillers with Two-Stage Compression and Interstage Vapor Injection Technologies," Energies, MDPI, vol. 15(24), pages 1-19, December.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:24:p:9562-:d:1005765
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    References listed on IDEAS

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