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Corrosion of Metal Alloys in Potassium Acetate Solutions for Liquid Desiccant Dehumidification and Air Conditioning

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  • Kerry C. Rippy

    (National Renewable Energy Laboratory, Golden, CO 80401, USA
    Advanced Energy Systems Graduate Program, Colorado School of Mines and the National Renewable Energy Laboratory, Golden, CO 80401, USA
    These authors contributed equally to this work.)

  • Emily Volk

    (Advanced Energy Systems Graduate Program, Colorado School of Mines and the National Renewable Energy Laboratory, Golden, CO 80401, USA
    These authors contributed equally to this work.)

  • Reagan Beers

    (National Renewable Energy Laboratory, Golden, CO 80401, USA)

  • Eric Kozubal

    (National Renewable Energy Laboratory, Golden, CO 80401, USA)

  • Kristin Gauderman

    (National Renewable Energy Laboratory, Golden, CO 80401, USA)

  • Judith Vidal

    (National Renewable Energy Laboratory, Golden, CO 80401, USA)

Abstract

For commercial buildings, liquid desiccant air conditioners (LDACs) could provide up to 80% energy savings compared to high-efficiency vapor compression AC, but commonly utilized liquid desiccants are highly corrosive. This precludes the use of metallic components, necessitating specialized plastics and thereby driving up cost, weight, and limiting operational temperature and pressure ranges. Less corrosive alternatives are sought. Here, potassium acetate solutions are investigated as less-corrosive alternatives to the chloride salt solutions that are typically used in LDAC systems. Corrosion evaluations for a Cu alloy (C12200) and two Al alloys (Al3003 and Al1100) in both potassium acetate and chloride salt solutions are presented. We show that yearly corrosion rates are lower in potassium acetate solutions by up to three orders of magnitude. Active corrosion behavior is largely absent in potassium acetate solutions but is present in chloride salt solutions. Furthermore, solid corrosion products are observed in chloride salt solutions. Thus, we conclude that potassium acetate is a promising candidate as a less corrosive alternative liquid desiccant for LDAC systems with metallic components.

Suggested Citation

  • Kerry C. Rippy & Emily Volk & Reagan Beers & Eric Kozubal & Kristin Gauderman & Judith Vidal, 2022. "Corrosion of Metal Alloys in Potassium Acetate Solutions for Liquid Desiccant Dehumidification and Air Conditioning," Energies, MDPI, vol. 15(12), pages 1-19, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4421-:d:841499
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    References listed on IDEAS

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    1. Liu, Xiaoli & Qu, Ming & Liu, Xiaobing & Wang, Lingshi, 2019. "Membrane-based liquid desiccant air dehumidification: A comprehensive review on materials, components, systems and performances," Renewable and Sustainable Energy Reviews, Elsevier, vol. 110(C), pages 444-466.
    2. Wen, Tao & Lu, Lin & Li, Mai & Zhong, Hong, 2018. "Comparative study of the regeneration characteristics of LiCl and a new mixed liquid desiccant solution," Energy, Elsevier, vol. 163(C), pages 992-1005.
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