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Enhanced performance of wet compression-resorption heat pumps by using NH3-CO2-H2O as working fluid

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  • Gudjonsdottir, V.
  • Infante Ferreira, C.A.
  • Rexwinkel, Glenn
  • Kiss, Anton A.

Abstract

Upgrading waste heat by compression resorption heat pumps (CRHP) has the potential to make a strong impact in industry. The efficiency of CRHP can be further improved by using alternative working fluids. In this work, the addition of carbon dioxide to aqueous ammonia solutions for application in CRHP is investigated. The previously published thermodynamic models for the ternary mixture are evaluated by comparing their results with experimental thermodynamic data, and checking their advantages and disadvantages. Then the models are used to investigate the impact of adding CO2 to NH3-H2O in wet compression resorption heat pump applications. For an application where a waste stream is heated from 60 to 105 °C, a COP increase of up to 5% can be attained by adding CO2 to the ammonia-water mixture, without any risk of salt formation. Additional advantages of adding CO2 to the ammonia-water mixture in that case are decreased pressure ratio, as well as an increase in the lower pressure level. When practical pressure restrictions are considered the benefits of the added CO2 become even larger or around 25% increase in the COP. Nonetheless, when the waste stream was considered to be additionally cooled down, no significant benefits were observed.

Suggested Citation

  • Gudjonsdottir, V. & Infante Ferreira, C.A. & Rexwinkel, Glenn & Kiss, Anton A., 2017. "Enhanced performance of wet compression-resorption heat pumps by using NH3-CO2-H2O as working fluid," Energy, Elsevier, vol. 124(C), pages 531-542.
    • Handle: RePEc:eee:energy:v:124:y:2017:i:c:p:531-542
    DOI: 10.1016/j.energy.2017.02.051
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    References listed on IDEAS

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    1. Long, Nguyen Van Duc & Lee, Moonyong, 2015. "A hybrid technology combining heat pump and thermally coupled distillation sequence for retrofit and debottlenecking," Energy, Elsevier, vol. 81(C), pages 103-110.
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    3. Kiss, Anton A. & Flores Landaeta, Servando J. & Infante Ferreira, Carlos A., 2012. "Towards energy efficient distillation technologies – Making the right choice," Energy, Elsevier, vol. 47(1), pages 531-542.
    4. van de Bor, D.M. & Infante Ferreira, C.A. & Kiss, Anton A., 2015. "Low grade waste heat recovery using heat pumps and power cycles," Energy, Elsevier, vol. 89(C), pages 864-873.
    5. van de Bor, D.M. & Infante Ferreira, C.A., 2013. "Quick selection of industrial heat pump types including the impact of thermodynamic losses," Energy, Elsevier, vol. 53(C), pages 312-322.
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    Cited by:

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