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.
|Title of host publication||Proceedings of the 25th IIR International Congress of Refrigeration|
|Number of pages||8|
|Publisher||International Institute of Refrigeration|
|Publication status||Published - 2019|
|Event||25th IIR International Congress of Refrigeration (ICR 2019) - Montréal , Canada|
Duration: 24 Aug 2019 → 30 Aug 2019
|Conference||25th IIR International Congress of Refrigeration (ICR 2019)|
|Period||24/08/2019 → 30/08/2019|
Bibliographical noteCopyright © IIF/IIR.
Published with the authorization of the International Institute of Refrigeration (IIR): www.iifiir.org
- Large-scale heat pumps
- District heating
- Natural refrigerant
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.