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Study on the performances of an ejector as adiabatic absorber in absorption cycles.

Author(s) : VEREDA C., VENTAS R., LECUONA A., et al.

Summary

This paper presents a numerical model of an ejector-absorption (single-effect) refrigeration cycle incorporating a triple purpose ejector: as an adiabatic absorber, as solution expansion valve and as pressure booster for refrigerant. The promising ammonia-lithium nitrate solution has been selected as working pair. The ejector attracts refrigerant vapor from the evaporator using momentum transfer from a high velocity mixture of the poor in refrigerant solution, coming from the generator, and the recirculated solution coming from the outlet of the absorber. With the use of the ejector, the absorption pressure becomes higher than the evaporation pressure. This way the cycle works with three pressure levels instead of the two levels that characterize a conventional single-effect absorption cycle. The main difference with respect to a standard adiabatic absorber configuration is the use of a single pump instead of two pumps (recirculation and solution). The interest of this configuration lays in the possibility of significantly reducing the volume of the absorber and using only one pump. This seems of interest for small capacity absorption chillers. The objective of the numerical model is: 1) to evaluate the influence of the ejector geometry and the amount of recirculated flow rate on the cycle performances; and 2) to bound the range of the heat source temperature and recirculated flow rate where this cycle offers the best performances. Results of the simulation show that the use of the ejector-absorber allows decreasing the activation temperature with respect to the single-effect absorption cycle with adiabatic absorber.

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Pages: 227-236

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Details

  • Original title: Study on the performances of an ejector as adiabatic absorber in absorption cycles.
  • Record ID : 30001195
  • Languages: English
  • Source: Sources/sinks Alternative to the Outside Air for Heat Pump and Air-conditioning Techniques (Alternative Sources - AS), Padua, Italy, April 5-7, 2011. / International Sorption Heat Pump Conference (ISHPC11), Padua, Italy, April 6-8, 2011.
  • Publication date: 2011/04/06

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