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Modelling a solar absorption chiller using positive flash to estimate the physical state of streams and theoretical plate concept for the generator

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  • Sochard, Sabine
  • Castillo Garcia, Lorenzo
  • Serra, Sylvain
  • Vitupier, Yann
  • Reneaume, Jean-Michel

Abstract

In this paper a general model for the steady state simulation of a solar absorption chiller is proposed. The novelty of this model is to calculate the physical state of all the streams rather than fix them (especially at the outlet of the condenser and evaporator). The thermodynamic properties of the mixture can be calculated by suitable predictive thermodynamic models, hence the working pair can be changed easily. Using this thermodynamic model, a general Positive Flash model is able to describe all the possible states (sub-cooled, super-heated, biphasic) of the various streams which are all considered as multicomponent mixtures. In the positive flash the same set of governing equations is valid for all phase regions. Another originality of the present study is that the generator is modelled as a distillation column, using the theoretical plate concept: MESH equations (Mass balance, Equilibrium, Summation, Heat balance) were written for each stage. Despite the modular structure of the software, a global solution strategy was implemented, using a Newton-Raphson method. This model is successfully compared to an example in the literature which deals with a GAX (Generator-Absorber heat eXchange) configuration absorption chiller using ammonia/water as the working pair.

Suggested Citation

  • Sochard, Sabine & Castillo Garcia, Lorenzo & Serra, Sylvain & Vitupier, Yann & Reneaume, Jean-Michel, 2017. "Modelling a solar absorption chiller using positive flash to estimate the physical state of streams and theoretical plate concept for the generator," Renewable Energy, Elsevier, vol. 109(C), pages 121-134.
    • Handle: RePEc:eee:renene:v:109:y:2017:i:c:p:121-134
    DOI: 10.1016/j.renene.2017.03.015
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    References listed on IDEAS

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    1. Jawahar, C.P. & Saravanan, R., 2010. "Generator absorber heat exchange based absorption cycle--A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(8), pages 2372-2382, October.
    2. Lazrak, Amine & Boudehenn, François & Bonnot, Sylvain & Fraisse, Gilles & Leconte, Antoine & Papillon, Philippe & Souyri, Bernard, 2016. "Development of a dynamic artificial neural network model of an absorption chiller and its experimental validation," Renewable Energy, Elsevier, vol. 86(C), pages 1009-1022.
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    4. Yari, Mortaza & Zarin, Arash & Mahmoudi, S.M.S., 2011. "Energy and exergy analyses of GAX and GAX hybrid absorption refrigeration cycles," Renewable Energy, Elsevier, vol. 36(7), pages 2011-2020.
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