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Thermodynamic comparison of different designs of single stage ammonia/water absorption heat pumps.

Author(s) : MOSER H., RIEBERER R.

Summary

At the Institute of Thermal Engineering, a small-capacity ammonia/water absorption heat pumping unit (AHP) with about 5 kW cooling capacity has been constructed and tested in the laboratory. In order to reduce the first costs of the AHP for all heat exchangers, standard plate heat exchangers have been used. Due to the use of plate heat exchangers in both, the absorber and the generator solution is passed through the components in co-current flow of liquid and vapour phase which leads to a thermodynamic disadvantage compared to especially designed components, i.e. expensive heat exchanger enabling counter-current flow. In this work, two thermodynamic models have been set up in order to calculate the thermodynamic penalty of a co-current flow in the generator compared to a counter-current flow and an exergy analysis has been carried out to identify irreversibilities associated with inefficient processes and to calculate the specific exergy loss of each component.

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Pages: 2008-2

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Details

  • Original title: Thermodynamic comparison of different designs of single stage ammonia/water absorption heat pumps.
  • Record ID : 2009-0357
  • Languages: English
  • Source: 8th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2008)
  • Publication date: 2008/09/07

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