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Single-phase ejector geometry optimisation by means of a multi-objective evolutionary algorithm and a surrogate CFD model

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  • Expósito Carrillo, José Antonio
  • Sánchez de La Flor, Francisco José
  • Salmerón Lissén, José Manuel

Abstract

The effort made by researchers and companies to reduce the expected increase in the energy demand for cooling and air conditioning has generated an interest in ejector cooling technologies. Researchers have proposed several typologies of ejector cooling cycles. However, the Coefficient of Performance achieved by this type of cycles is still poor, mainly due to the poor performance of the ejector. Several authors have dealt with the low performance of ejector cooling cycles by suggesting modifications to the cycle combining the ejector with other components. However, few approaches have attempted to optimise the geometrical parameters defining the ejectors, and even fewer to optimise the back pressure and the entrainment ratio, which are key parameters in the ejector efficiency. The main aim of this article is to optimise the performance of a single-phase ejector by means of a Multi-Objective Evolutionary Algorithm coupled with a surrogate model based on CFD simulations. The methodology has been implemented for air as an ideal gas and for CO2 with a real gas model. The results showed a potential increase of 55% and 110% in the back pressure and the entrainment ratio for air and 10% and 35% respectively for CO2.

Suggested Citation

  • Expósito Carrillo, José Antonio & Sánchez de La Flor, Francisco José & Salmerón Lissén, José Manuel, 2018. "Single-phase ejector geometry optimisation by means of a multi-objective evolutionary algorithm and a surrogate CFD model," Energy, Elsevier, vol. 164(C), pages 46-64.
    • Handle: RePEc:eee:energy:v:164:y:2018:i:c:p:46-64
    DOI: 10.1016/j.energy.2018.08.176
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    References listed on IDEAS

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    1. Isaac, Morna & van Vuuren, Detlef P., 2009. "Modeling global residential sector energy demand for heating and air conditioning in the context of climate change," Energy Policy, Elsevier, vol. 37(2), pages 507-521, February.
    2. Sharifi, Navid & Sharifi, Majid, 2014. "Reducing energy consumption of a steam ejector through experimental optimization of the nozzle geometry," Energy, Elsevier, vol. 66(C), pages 860-867.
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    More about this item

    Keywords

    Ejector; Single-phase; Air; CO2; MOEA; CFD;
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