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New flat-fan sheets adiabatic absorber for direct air-cooled LiBr/H2O absorption machines: Simulation, parametric study and experimental results

Author

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  • González-Gil, A.
  • Izquierdo, M.
  • Marcos, J.D.
  • Palacios, E.

Abstract

A new generation of highly efficient absorbers for direct air-cooled LiBr/H2O absorption machines is presented and discussed in this paper. As distinguishing aspects of these absorbers, it is worth mentioning that they are adiabatic units, which improves the heat and mass transfer; besides, they distribute the solution in flat-fan sheets, which allows for compact absorber designs; lastly, they are directly air-cooled units, which eliminates the need of cooling towers. Additionally, the paper includes the development of a mathematical modeling for analysis and simulation of this kind of absorbers. Based on that model, a parametric study of the proposed absorber design is carried out to optimize its use in a particular air-cooled single–double-effect absorption machine. Simulation outcomes of that specific absorber were compared with some experimental results obtained by using the aforementioned absorption machine as testing facility to validate the model. A good agreement was found between predictions and experimental results for most of the characteristic operation parameters of the absorber. Finally, it was observed that the proposed absorber design enables air-cooled LiBr/H2O absorption machines to work far from crystallization limits even at ambient temperatures around 40°C.

Suggested Citation

  • González-Gil, A. & Izquierdo, M. & Marcos, J.D. & Palacios, E., 2012. "New flat-fan sheets adiabatic absorber for direct air-cooled LiBr/H2O absorption machines: Simulation, parametric study and experimental results," Applied Energy, Elsevier, vol. 98(C), pages 162-173.
    • Handle: RePEc:eee:appene:v:98:y:2012:i:c:p:162-173
    DOI: 10.1016/j.apenergy.2012.03.019
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    References listed on IDEAS

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    1. Torrella, E. & Sánchez, D. & Cabello, R. & Larumbe, J.A. & Llopis, R., 2009. "On-site real-time evaluation of an air-conditioning direct-fired double-effect absorption chiller," Applied Energy, Elsevier, vol. 86(6), pages 968-975, June.
    2. Izquierdo, M. & Marcos, J.D. & Palacios, M.E. & González-Gil, A., 2012. "Experimental evaluation of a low-power direct air-cooled double-effect LiBr–H2O absorption prototype," Energy, Elsevier, vol. 37(1), pages 737-748.
    3. Palacios, E. & Izquierdo, M. & Marcos, J.D. & Lizarte, R., 2009. "Evaluation of mass absorption in LiBr flat-fan sheets," Applied Energy, Elsevier, vol. 86(12), pages 2574-2582, December.
    4. Ali, Ahmed Hamza H., 2010. "Design of a compact absorber with a hydrophobic membrane contactor at the liquid-vapor interface for lithium bromide-water absorption chillers," Applied Energy, Elsevier, vol. 87(4), pages 1112-1121, April.
    5. Somers, C. & Mortazavi, A. & Hwang, Y. & Radermacher, R. & Rodgers, P. & Al-Hashimi, S., 2011. "Modeling water/lithium bromide absorption chillers in ASPEN Plus," Applied Energy, Elsevier, vol. 88(11), pages 4197-4205.
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    1. N'Tsoukpoe, K.E. & Le Pierrès, N. & Luo, L., 2013. "Experimentation of a LiBr–H2O absorption process for long-term solar thermal storage: Prototype design and first results," Energy, Elsevier, vol. 53(C), pages 179-198.
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    3. Cola, Fabrizio & Hey, Jonathan & Romagnoli, Alessandro, 2018. "Characterization of the droplet formation phase for the H2OLiBr absorber: An analytical and experimental analysis," Applied Energy, Elsevier, vol. 222(C), pages 885-897.
    4. Izquierdo, M. & González-Gil, A. & Palacios, E., 2014. "Solar-powered single-and double-effect directly air-cooled LiBr–H2O absorption prototype built as a single unit," Applied Energy, Elsevier, vol. 130(C), pages 7-19.

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