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A Review of the State of the Art on Ionic Liquids and Their Physical Properties During Heat Transfer

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  • Krzysztof Dutkowski

    (Department of Mechanical and Power Engineering, Koszalin University of Technology, 75-453 Koszalin, Poland)

  • Marcin Kruzel

    (Department of Mechanical and Power Engineering, Koszalin University of Technology, 75-453 Koszalin, Poland)

  • Małgorzata Smuga-Kogut

    (Department of Mechanical and Power Engineering, Koszalin University of Technology, 75-453 Koszalin, Poland)

  • Marcin Walczak

    (Department of Electronics and Computer Science, Koszalin University of Technology, 75-453 Koszalin, Poland)

Abstract

This paper presents information on ionic liquids (ILs) and explores their potential applications in heat exchange systems. Basic information on ionic liquids and their selected thermophysical properties is presented in a manner that facilitates their use in future research. The physical properties of IL that are important in the area of heat exchange are described in detail, with particular emphasis on heat exchange in flow. Issues related to the melting point, specific heat, thermal conductivity coefficient, and viscosity of selected ionic liquids, as well as the effect of temperature on their changes, are discussed. The physical properties of IL are compared with the physical properties of water treated in heat exchange as a reference substance. The issues of creating aqueous solutions of ionic liquids and the effect of the amount of water on the physical properties of the resulting solution are discussed. It is demonstrated that selected ionic liquids can be considered an alternative to traditional working liquids commonly used in heat exchange systems.

Suggested Citation

  • Krzysztof Dutkowski & Marcin Kruzel & Małgorzata Smuga-Kogut & Marcin Walczak, 2025. "A Review of the State of the Art on Ionic Liquids and Their Physical Properties During Heat Transfer," Energies, MDPI, vol. 18(15), pages 1-25, July.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:15:p:4053-:d:1713555
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    References listed on IDEAS

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    1. Carlos A. Nieto de Castro & Maria José V. Lourenço, 2019. "Towards the Correct Measurement of Thermal Conductivity of Ionic Melts and Nanofluids," Energies, MDPI, vol. 13(1), pages 1-17, December.
    2. Cao, Bowen & Yin, Yonggao & Xu, Guoying & Cheng, Xiaosong & Li, Wenzhang & Ji, Qiang & Chen, Wanhe, 2023. "A proposed method of bubble absorption-based deep dehumidification using the ionic liquid for low-humidity industrial environments with experimental performance," Applied Energy, Elsevier, vol. 348(C).
    3. Aishorjo Bablee & Ananda Amarasekara & Jorge Gabitto & Ariful Bhuiyan & Nabila Shamim, 2025. "A Comprehensive Review of the Thermophysical Properties of Energetic Ionic Liquids," Energies, MDPI, vol. 18(2), pages 1-38, January.
    4. Xie, Yujiao & Ma, Chunyan & Lu, Xiaohua & Ji, Xiaoyan, 2016. "Evaluation of imidazolium-based ionic liquids for biogas upgrading," Applied Energy, Elsevier, vol. 175(C), pages 69-81.
    5. Łukasz Mika & Ewelina Radomska & Karol Sztekler & Andrzej Gołdasz & Wiesław Zima, 2025. "Review of Selected PCMs and Their Applications in the Industry and Energy Sector," Energies, MDPI, vol. 18(5), pages 1-27, March.
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