Performance comparison among two-phase, liquid, and vapor injection heat pumps with a scroll compressor using R410A

Dongwoo Kim, Yongseok Jeon, Dong Soo Jang, Yongchan Kim

    Research output: Contribution to journalArticlepeer-review

    73 Citations (Scopus)

    Abstract

    Although two-phase injection technique is expected to improve the performance and reliability of heat pumps in cold climate conditions, its application is limited due to wet-compression. In this study, a numerical model was developed and validated to predict the performance of liquid, vapor, and two-phase injection heat pumps. The performance characteristics of the liquid, vapor, and two-phase injection heat pumps with a scroll compressor using R410A were compared with the others, based on the predicted data. The optimum injection quality in the two-phase injection heat pump to achieve maximum COP was analyzed as a function of the injection pressure, compressor frequency, and outdoor temperature. The two-phase injection heat pump with the optimum injection quality exhibited the highest COP among all injection types with a proper discharge temperature. In addition, the two-phase injection heat pump with the optimum injection quality was more effective in COP improvement with decreasing outdoor temperature.

    Original languageEnglish
    Pages (from-to)193-202
    Number of pages10
    JournalApplied Thermal Engineering
    Volume137
    DOIs
    Publication statusPublished - 2018 Jun 5

    Bibliographical note

    Funding Information:
    This work was supported by the Industrial Core Technology Development Program (No. 10049090 ) of the Korea Evaluation Institute of Industrial Technology (KEIT) – Republic of Korea funded by the Korea Government Ministry of Trade, Industry and Energy, Republic of Korea.

    Publisher Copyright:
    © 2018 Elsevier Ltd

    Keywords

    • Heat pump
    • Liquid injection
    • Scroll compressor
    • Two-phase injection
    • Vapor injection

    ASJC Scopus subject areas

    • Energy Engineering and Power Technology
    • Industrial and Manufacturing Engineering

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