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Effect of vapour flow on the falling-film heat and mass transfer of the ammonia/water absorber.

Author(s) : KWON K., JEONG S.

Type of article: Article, IJR article

Summary

Falling-film heat and mass transfer in an absorber can be influenced by the motion of the surrounding refrigerant vapour. In this study, the effect of the vapour flow direction on the absorption heat and mass transfer has been investigated for a falling-film helical coil absorber which is frequently used in the ammonia/water absorption refrigerators. The heat and mass transfer performance was measured for both parallel and counter-current flow. The experiments were carried out for three different solution concentrations (3, 14, and 30%). The vapour in equilibrium with the solution is supplied to the test section. It was found that the falling-film heat and mass transfer deteriorated in the counter-current flow if the specific volume of the vapour solution was large. For the counter-current flow, the high velocity of the vapour due to the large specific volume seems to cause an unfavourable distribution of the falling film and reduce the heat and mass transfer performance of the ammonia absorber. The effect of vapour flow direction decreased with increasing concentration of ammonia solution since the specific volume of the ammonia vapour which is in equilibrium with the solution becomes smaller and the vapour velocity becomes lower.

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Pages: 955-964

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Details

  • Original title: Effect of vapour flow on the falling-film heat and mass transfer of the ammonia/water absorber.
  • Record ID : 2005-0604
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 27 - n. 8
  • Publication date: 2004/12

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