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A dynamic simulation model for transient absorption chiller performance. 2. Numerical results and experimental verification.

Author(s) : KOHLENBACH P., ZIEGLER F.

Type of article: Article, IJR article

Summary

This paper is the second paper out of two which present the development of a dynamic model for single-effect LiBr/water absorption chillers. The first part (see this Bulletin, reference 2008-0634) describes the model in detail with respect to the heat and mass balances as well as the dynamic terms. This second part presents a more detailed investigation of the model performance, including performance analysis, sensitivity checks and a comparison to experimental data. General model functionality is demonstrated. A sensitivity analysis gives results which agree very well to fundamental expectations: it shows that an increase in both external and internal thermal mass results in a slower response to the step change but also in smaller heat flow oscillations during the transient period. Also, the thermal mass has been found to influence the heat flow transients more significantly if allocated internally. The time shift in the solution cycle has been found to influence both the time to reach steady-state and the transients and oscillations of the heat flow. A smaller time shift leads to significantly faster response. A comparison with experimental data shows that the dynamic agreement between experiment and simulation is very good with dynamic temperature deviations between 10 and 25 s. The total time to achieve a new steady-state in hot water temperature after a 10 K input temperature step amounts to approximately 15 min. Compared to this, the present dynamic deviations are in the magnitude of approximately 1-3%.

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Pages: 226-233

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Details

  • Original title: A dynamic simulation model for transient absorption chiller performance. 2. Numerical results and experimental verification.
  • Record ID : 2008-0635
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 31 - n. 2
  • Publication date: 2008/03

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