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Ionic liquid screening and performance optimization of transcritical carbon dioxide absorption heat pump enhanced by expander

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  • Sui, Yunren
  • Wu, Wei

Abstract

Absorption technologies show great potential in utilizing renewable energy and waste heat. In this study, novel CO2/ionic liquid (IL) mixtures are investigated to overcome the shortcomings of conventional working fluids. To screen the optimum ILs for a transcritical CO2/IL absorption heat pump (TsCO2-AHP), the absorption cycle models using 34 IL species are established to estimate the cycle performance. Within the selected candidates, [OMIM][Tf2N] yields the best cycle performance. For imidazolium-based ILs with different anions, the coefficient of performance (COP) is in the order of [Tf2N] > [C(CN)3] > [OTF] > [DCA] ≈ [PF6]. [EMIM][C(CN)3] yields the highest heat transfer coefficient of 0.520 kW/(m2·K) due to its better transport properties compared to other candidates. The high-side pressure optimization is conducted to maximize the COP. At the generator temperature of 138 °C, the COP of CO2/[OMIM][Tf2N] reaches the highest 0.2614 with the optimum Phigh of 10.289 MPa. By equipping an expander, the COP of the TsCO2-AHP is improved by 11.9% because of a larger cooling capacity and less electricity consumption. The main objectives are contributing novel potential working fluids, optimizing the cycle parameters, as well as selecting the best-performance CO2/IL mixture for improved development of absorption technologies.

Suggested Citation

  • Sui, Yunren & Wu, Wei, 2023. "Ionic liquid screening and performance optimization of transcritical carbon dioxide absorption heat pump enhanced by expander," Energy, Elsevier, vol. 263(PA).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pa:s0360544222025750
    DOI: 10.1016/j.energy.2022.125689
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    1. Jiang, L. & Ji, Y. & Shi, W.K. & Fang, M.X. & Wang, T. & Zhang, X.J., 2023. "Adsorption heat/mass conversion cycle for carbon capture:Concept, thermodynamics and perspective," Energy, Elsevier, vol. 278(PA).
    2. Ji, Qiang & Wang, Yikai & Yin, Yonggao & Wang, Mu & Che, Chunwen & Cao, Bowen & Chen, Wanhe, 2023. "Cooling performance of compression-absorption cascade system with novel ternary ionic-liquid working pair," Energy, Elsevier, vol. 278(PB).
    3. Yunren Sui & Zengguang Sui & Guangda Liang & Wei Wu, 2023. "Superhydrophobic Microchannel Heat Exchanger for Electric Vehicle Heat Pump Performance Enhancement," Sustainability, MDPI, vol. 15(18), pages 1-20, September.

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