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Extremely high efficient heat pump with desiccant coated evaporator and condenser

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  • Hua, L.J.
  • Ge, T.S.
  • Wang, R.Z.

Abstract

The desiccant coated heat exchanger (DCHE), utilizing inner cooling source to ease the side effect of sorption heat, is now a hot spot in the field of humidity control. Meanwhile, when incorporated in heat pumps, the function of DCHEs is expected to be further extended. Named as solid desiccant heat pump (SDHP), such system can realize weakly-coupled temperature and humidity control both in the cooling and heating modes. Promising refrigerants are near-azeotropic mixtures, and the DCHEs in SDHP then function as desiccant-coated evaporators/condensers (DCEs/DCCs). In this paper, a comprehensive physical and mathematical description of the DCEs/DCCs is first proposed to conduct the thermodynamic analysis of the component. Furthermore, the system simulation of the SDHP validates the feasibility of the vapor compression (VC) cycle with the new type of heat exchangers (HXs), and the calculated coefficient of performance (COP) is 7.19. The precision of the component model, along with the superiority of the SDHP, is then verified by an experimental setup. The experimental study also reveals that, with the outdoor air of 35 °C, 21 g/kg (indoor 25%, 10 g/kg, 70%fresh air), the SDHP can provide cold and dry supply air of 20 °C, 8.5 g/kg and the corresponding COP reaches to 7.14.

Suggested Citation

  • Hua, L.J. & Ge, T.S. & Wang, R.Z., 2019. "Extremely high efficient heat pump with desiccant coated evaporator and condenser," Energy, Elsevier, vol. 170(C), pages 569-579.
    • Handle: RePEc:eee:energy:v:170:y:2019:i:c:p:569-579
    DOI: 10.1016/j.energy.2018.12.169
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    References listed on IDEAS

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    1. Ge, T.S. & Dai, Y.J. & Wang, R.Z. & Li, Y., 2008. "Experimental investigation on a one-rotor two-stage rotary desiccant cooling system," Energy, Elsevier, vol. 33(12), pages 1807-1815.
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    3. Ge, T.S. & Li, Y. & Wang, R.Z. & Dai, Y.J., 2008. "A review of the mathematical models for predicting rotary desiccant wheel," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(6), pages 1485-1528, August.
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    Citations

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    Cited by:

    1. Shuo Liu & Chang-Ho Jeong & Myoung-Souk Yeo, 2020. "Effect of Evaporator Position on Heat Pump Assisted Solid Desiccant Cooling Systems," Energies, MDPI, vol. 13(22), pages 1-21, November.
    2. Gao, D.C. & Sun, Y.J. & Ma, Z. & Ren, H., 2021. "A review on integration and design of desiccant air-conditioning systems for overall performance improvements," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    3. Shao, Z. & Wang, Z.G. & Poredoš, P. & Ge, T.S. & Wang, R.Z., 2023. "Highly efficient desiccant-coated heat exchanger-based heat pump to decarbonize rail transportation," Energy, Elsevier, vol. 271(C).
    4. Wang, Cong & Yang, Bianfeng & Ji, Xu & Zhang, Ren & Wu, Hailong, 2022. "Study on activated carbon/silica gel/lithium chloride composite desiccant for solid dehumidification," Energy, Elsevier, vol. 251(C).
    5. Feng, Y.H. & Dai, Y.J. & Wang, R.Z. & Ge, T.S., 2022. "Insights into desiccant-based internally-cooled dehumidification using porous sorbents: From a modeling viewpoint," Applied Energy, Elsevier, vol. 311(C).
    6. Hua, Lingji & Wang, Ruzhu, 2022. "An exergy analysis and parameter optimization of solid desiccant heat pumps recovering the condensation heat for desiccant regeneration and heat transfer enhancement," Energy, Elsevier, vol. 238(PB).
    7. Zhang, Yu & Wang, Weining & Zheng, Xu & Cai, Jinliang, 2024. "Recent progress on composite desiccants for adsorption-based dehumidification," Energy, Elsevier, vol. 302(C).
    8. Shan, He & Poredoš, Primož & Zou, Hao & Lv, Haotian & Wang, Ruzhu, 2023. "Perspectives for urban microenvironment sustainability enabled by decentralized water-energy-food harvesting," Energy, Elsevier, vol. 282(C).
    9. Zu, Kan & Qin, Menghao & Cui, Shuqing, 2020. "Progress and potential of metal-organic frameworks (MOFs) as novel desiccants for built environment control: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    10. Yang, Tianyu & Ge, Tianshu, 2024. "Performance study of a heat pump fresh air unit based on desiccant coated heat exchangers under different operation strategies," Energy, Elsevier, vol. 296(C).

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