Thermodynamic assessment of high-temperature heat pumps using low-GWP HFO refrigerants for heat recovery

Chieko Kondou, Shigeru Koyama

    研究成果: ジャーナルへの寄稿記事

    39 引用 (Scopus)

    抄録

    Abstract Reducing energy consumption by utilizing heat recovery systems has become increasingly important in industry. This paper presents an exploratory assessment of heat pump type heat recovery systems using environmentally friendly refrigerants. The coefficient of performance (COP) of 4 cycle configurations used to raise the temperature of heat media to 160 °C with a waste heat at 80 °C is calculated and compared for refrigerants R717, R365mfc, R1234ze(E), and R1234ze(Z). A multiple-stage "extraction" cycle drastically reduces the throttling loss and exergy loss in the condensers, resulting in the highest COP for R1234ze(Z). A cascade cycle using R1234ze(Z) and R365mfc has a relatively high COP and provides practical benefits. Even under adverse conditions, the primary energy efficiency is greater than 1.3 when the transmission end efficiency of the electric power generation is 0.37. The assessment demonstrated that high-temperature heat pumps are a promising approach for reducing primary energy consumption for industrial applications.

    元の言語英語
    記事番号2884
    ページ(範囲)126-141
    ページ数16
    ジャーナルInternational Journal of Refrigeration
    53
    DOI
    出版物ステータス出版済み - 1 1 2015

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    Refrigerants
    Waste heat utilization
    Pumps
    Thermodynamics
    Energy utilization
    Electric power generation
    Exergy
    Waste heat
    Temperature
    Industrial applications
    Energy efficiency
    Hot Temperature
    Industry

    All Science Journal Classification (ASJC) codes

    • Building and Construction
    • Mechanical Engineering

    これを引用

    Thermodynamic assessment of high-temperature heat pumps using low-GWP HFO refrigerants for heat recovery. / Kondou, Chieko; Koyama, Shigeru.

    :: International Journal of Refrigeration, 巻 53, 2884, 01.01.2015, p. 126-141.

    研究成果: ジャーナルへの寄稿記事

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