Comparison of zeotropic working fluid mixtures in different heat pump cycles

B. Zühlsdorf*, J. K. Jensen*, L. O. Reinholdt*, B. Elmegaard*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Heat pumps are often integrated into boundary conditions with a temperature glide, resulting in inevitable inefficiencies due to heat transfer. Zeotropic mixtures have the potential to match the temperature profiles but require a screening procedure to select the best performing working fluid during the heat pump design. Hybrid compression-absorption heat pumps are an alternative technology, in which a recirculation pump can adjust the temperature profile of a pre-selected working fluid e.g., ammonia/water. This cycle is more complex but enables to avoid the working fluid screening. This paper compared the two approaches with each other and to pure working fluids to evaluate the potential under different boundary conditions. Both systems outperformed conventional systems using pure fluids. The optimal zeotropic mixtures were found to show the highest thermodynamic performances while the hybrid cycle with ammonia/water enabled more compact compression equipment.

Original languageEnglish
Title of host publicationProceedings of the 25th IIR International Congress of Refrigeration
PublisherInternational Institute of Refrigeration
Publication date2019
Article number1169
ISBN (Electronic)9782362150357
Publication statusPublished - 2019
Event25th IIR International Congress of Refrigeration (ICR 2019) - Montréal , Canada
Duration: 24 Aug 201930 Aug 2019


Conference25th IIR International Congress of Refrigeration (ICR 2019)
SeriesRefrigeration Science and Technology

Bibliographical note

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


  • Heat Pump
  • Temperature Glide Matching
  • Working Fluid
  • Zeotropic Mixture

Fingerprint Dive into the research topics of 'Comparison of zeotropic working fluid mixtures in different heat pump cycles'. Together they form a unique fingerprint.

Cite this