Optimum cycle control of a two-stage injection heat pump with a double expansion sub-cooler

Jaehyeok Heo, Hoon Kang, Yongchan Kim

    Research output: Contribution to journalArticlepeer-review

    42 Citations (Scopus)

    Abstract

    The refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures, and various control methods for a heat pump with injection have been presented. However, most studies on cycle control have been theoretical, and practical control methods for cycle optimization based on experimental results hardly have been presented. In this study, an optimum cycle control method was proposed for a refrigerant injection heat pump with a double expansion sub-cooler based on the intermediate pressure and the injection ratio. The optimum sub-cooler pressure ratio was proposed from 0.4 to 0.7 in view of the heating capacity, and from 0.7 to 0.8 in view of the COP. The optimum injection ratio increased from 0.1 to 0.3 with an increase in the compression ratio.

    Original languageEnglish
    Pages (from-to)58-67
    Number of pages10
    JournalInternational Journal of Refrigeration
    Volume35
    Issue number1
    DOIs
    Publication statusPublished - 2012 Jan

    Bibliographical note

    Funding Information:
    This research was supported by a Korea University Grant and the Korea Institute of Energy Technology Evaluation and Planning (Grant No. 2010T100200474 ).

    Keywords

    • Control
    • Heat pump
    • Injection
    • Optimization
    • Two-stage

    ASJC Scopus subject areas

    • Building and Construction
    • Mechanical Engineering

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