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Design aspects and applications of resorption cycles.

Author(s) : HEWITT N. J., MCMULLAN J. T., MOLYNEAUX G.

Summary

The ammonia-water or resorption cycle is similar to the conventional absorption cycle in the fact that both absorption and desorption do take place, but in this case, their roles are reversed, i.e. absorption takes place on the high temperature side and desorption takes place on the low temperature side. In both cases, the absorption/resorption process alters the composition of the liquid and consequently, at a constant pressure, the temperature changes or "glides". The resorption cycle is a hybrid absorption-vapour compression system which has been shown to be capable of high temperature applications and high temperature lifts when using an ammonia-water mixture. The paper highlights the areas in which the operation of a high temperature heat pump of this type would be beneficial. Secondly, the design procedures are demonstrated for this type of cycle. Additionally, the use of log mean temperature difference as a heat exchanger design tool has been studied. Finally, compressor and lubricant selection are seen to be problematical. Oil free-screw compressors would alleviate (at least in part) the oil problems associated with these types of cycles.

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Pages: p 347-354

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Details

  • Original title: Design aspects and applications of resorption cycles.
  • Record ID : 1997-3020
  • Languages: English
  • Source: Applications for Natural Refrigerants
  • Publication date: 1996/09/03

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