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COP improvement of two-stage ammonia heat pumps by use of ejector.

Number: pap. n. 27

Author(s) : BANASIAK K., HAFNER A., STEINER A.

Summary

A feasibility study of the COP improvement in two-stage ammonia heat pumps modified with the ejector-operated economizer was carried out. A novel system architecture incorporating the ejector-driven flash gas removal from the economizer tank was discussed. A set of numerical simulations for the steady-state 0D model was carried out in order to estimate potential COP gains due to the introduced modification. The estimated COP improvement ranged between 2% and 5%, dependent on the system application (refrigeration unit or heat pump), operating conditions (evaporation temperature, condensing temperature) and ejector energy performance. Preliminary geometry sizing for the ammonia ejector was performed based on a 1D modelling approach.

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Pages: 8 p.

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Details

  • Original title: COP improvement of two-stage ammonia heat pumps by use of ejector.
  • Record ID : 30014633
  • Languages: English
  • Source: 6th Conference on Ammonia and CO2 Refrigeration Technology. Proceedings: Ohrid, North Macedonia, April 16-18, 2015.
  • Publication date: 2015/04/16

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