Mapping of Coefficient of Performance for large-scale ammonia heat pumps for district heating systems

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Abstract

Many system configurations of large-scale heat pumps (HP) are applicable to a district heating system, and choosing the right HP technology may be a challenge. In this study, thermodynamic models of eight different HP configurations are used to compare the Coefficient of Performance (COP) and Lorenz efficiency, for a range of sink and source outlet temperatures. Furthermore, for a specific case the total volume flow rate for each configuration was compared. The results revealed that a configuration with two two-stage cycles with low stage desuperheat heat exchangers in most operating conditions was superior in terms of COP. However, for all considered operating conditions at least three configurations obtained a COP which was less than 3 % lower than the best one. Comparing the volume flow rates among the configurations a combination of a one-stage cycle and a two-stage cycle with low stage desuperheat heat exchanger holds the lowest needed volume flow rate.
Original languageEnglish
Title of host publicationProceedings of the 25th IIR International Congress of Refrigeration
Number of pages8
PublisherInternational Institute of Refrigeration
Publication date2019
Publication statusPublished - 2019
Event25th IIR International Congress of Refrigeration (ICR 2019) - Montréal , Canada
Duration: 24 Aug 201930 Aug 2019

Conference

Conference25th IIR International Congress of Refrigeration (ICR 2019)
CountryCanada
CityMontréal
Period24/08/201930/08/2019

Bibliographical note

Copyright © IIF/IIR.
Published with the authorization of the International Institute of Refrigeration (IIR): www.iifiir.org

Keywords

  • Large-scale heat pumps
  • District heating
  • Natural refrigerant
  • COP

Cite this

Jørgensen, P. H., Ommen, T., Markussen, W. B., & Elmegaard, B. (2019). Mapping of Coefficient of Performance for large-scale ammonia heat pumps for district heating systems. In Proceedings of the 25th IIR International Congress of Refrigeration International Institute of Refrigeration.