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Mapping of coefficient of performance for large-­scale ammonia heat pumps for district heating systems.

Number: pap. n. 1276

Author(s) : JØRGENSEN P., OMMEN T., MARKUSSEN M., et al.

Summary

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.    

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  • Original title: Mapping of coefficient of performance for large-­scale ammonia heat pumps for district heating systems.
  • Record ID : 30026090
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1276

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