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Thermodynamic modelling of a LiBr-H2O absorption chiller by improvement of characteristic equation method.

Author(s) : FISCHER Y. C., DUTRA J. C. C., ROHATGI J.

Type of article: IJR article

Summary

In this study, approaches developed by previous studies which to improve the characteristic equation method applied to absorption chiller were analyzed and an approach is proposed aiming to make a further contribution. A computational code was designed containing the chiller thermodynamic modelling and the characteristic equations obtained by each approach. The modelling results and the characteristic equations results were numerically compared and the COP and heat removed (deviations between them were calculated. The sequence of approaches aimed to reduce these deviations. The first approach computed the characteristic parameters and used them as constant values. The second approach used a linear adjustment between the minimum characteristic temperature difference (ΔΔtminE) and the characteristic temperature difference. The third approach used the previous approach adjustment, and the following were inserted in the characteristic equations: linear adjustments between ΔΔtminE; SE and the lift temperature (∆tlift), and between ΔΔtminE; SE and the thrust temperature (∆tthrust). The ∆tthrust adjustment obtained the lowest deviations. Using ΔΔtminE obtained directly from the input data, a better linear adjustment was achieved between ΔΔtminE and ∆tthrust. The use of this adjustment was treated as a proposed approach and achieved even smaller deviations. Then, a case study of a commercial chiller was conducted with this approach. Most COP and deviations values obtained in this case study were lower than 5%. Deviations between the manufacturer's datasheet values and the characteristic equations results were lower than 10%. Therefore, it can be understood that this approach can contribute to the characteristic equation method.

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Pages: 420-429

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Details

  • Original title: Thermodynamic modelling of a LiBr-H2O absorption chiller by improvement of characteristic equation method.
  • Record ID : 30027867
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 120
  • Publication date: 2020/12
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2020.06.030
  • Document available for consultation in the library of the IIR headquarters only.

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