Optimal control of the gas-cooler pressure of a CO2 heat pump using EEV opening and outdoor fan speed in the cooling mode

Changhyun Baek, Jaehyeok Heo, Jongho Jung, Honghyun Cho, Yongchan Kim

    Research output: Contribution to journalArticlepeer-review

    53 Citations (Scopus)

    Abstract

    The objective of this study is to investigate the control methods of the gas-cooler pressure in a CO2 heat pump. The cooling performance of the CO2 heat pump was measured by varying the refrigerant charge amount, EEV opening, compressor frequency, and outdoor fan speed at various outdoor temperatures. The effects of the EEV opening and the outdoor fan speed on the gas-cooler pressure and the COP were analyzed by using the experimental data. In the standard cooling condition at the compressor frequency of 45 Hz, the optimum gas-cooler pressure and the maximum COP were 9200 kPa and 3.04, respectively, at the optimum EEV opening of 41% and outdoor fan speed of 500 rpm. As the compressor frequency increased from 45 Hz to 55 Hz at the standard cooling condition, the optimum outdoor fan speed increased from 500 rpm to 700 rpm.

    Original languageEnglish
    Pages (from-to)1276-1284
    Number of pages9
    JournalInternational Journal of Refrigeration
    Volume36
    Issue number4
    DOIs
    Publication statusPublished - 2013 Jun

    Bibliographical note

    Funding Information:
    This work was supported by the Korea Government Ministry of Knowledge Economy (No. 00014860-2010-34) and the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Knowledge Economy .

    Keywords

    • CO heat pump
    • Compressor frequency
    • Electronic expansion valve opening
    • Gas-cooler pressure
    • Outdoor fan speed
    • Refrigerant charge

    ASJC Scopus subject areas

    • Building and Construction
    • Mechanical Engineering

    Fingerprint

    Dive into the research topics of 'Optimal control of the gas-cooler pressure of a CO2 heat pump using EEV opening and outdoor fan speed in the cooling mode'. Together they form a unique fingerprint.

    Cite this