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Analysis of vapour extraction strategies for evaporators.

Author(s) : JOVANE M. E., BRAUN J. E., GROLL E. A.

Summary

Design of evaporator coils or other heat exchangers always involves a tradeoff between heat transfer and pressure drop. One idea that is considered in this paper for changing this tradeoff involves extracting refrigerant vapour from the two-phase, evaporating flow stream. It was hoped that an extraction strategy could be identified that would lead to reduced heat transfer requirements for the same cooling capacity and pressure drops as for a conventional coil. In order to evaluate this concept, an analytical model was developed that allows continuous extraction of the vapour from the two-phase flow stream. The refrigerant, the mass flow rate, the geometry of the coils, the number of circuits, and the inlet quality of the refrigerant are the input parameters of the model. The model is described in this paper and example results are presented for different extraction strategies using R-410A as the working fluid. For all the cases studied, the extraction of vapour did not provide any positive benefits in terms of reducing the required heat transfer area necessary to realize a given capacity and pressure drop.

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Details

  • Original title: Analysis of vapour extraction strategies for evaporators.
  • Record ID : 2007-1475
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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