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Distributed steady and dynamic modelling of dry-expansion evaporators.

Author(s) : JIA X., TSO C. P., JOLLY P., WONG Y. W.

Type of article: Article, IJR article

Summary

A general distributed parameter model is presented to describe both steady and dynamic behaviours of dry-expansion evaporators. The homogeneous and three different non-homogeneous two-phase flow models are used to evaluate the impact of different flow models on the accuracy of the simulation. The experimental work was carried out on a full-scale refrigeration system with R134a as the working fluid and without frost formation at the evaporator. Comparison between the modelling and experimental measurements shows that the drift flux flow models give satisfactory predictions. The simulation results indicate that an even air temperature distribution off the evaporator may be obtained by controlling liquid dry-out point at the two ends of the coil. The study also indicates that the counterflow configuration provides a higher heat exchange efficiency with a slower transient response compared with the cocurrent-flow configuration.

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Pages: 126-136

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Details

  • Original title: Distributed steady and dynamic modelling of dry-expansion evaporators.
  • Record ID : 1999-2225
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 22 - n. 2
  • Publication date: 1999/03

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