Generalized COP estimation of heat pump processes for operation off the design point of equipment

Torben Ommen*, Jonas K. Jensen, Wiebke Meesenburg, Pernille H. Jørgensen, Henrik Pieper, Wiebke B. Markussen, Brian Elmegaard

*Corresponding author for this work

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Heat pumps (HPs) and their individual components experience a significant share of operation away from the design point, due to both sink and source temperature variations as well as operation at part load. In the present study, we expand a generalized HP COP estimation for design conditions to include the performance of conditions within the typical limits for the operating range. The estimation was compared to results based on detailed thermodynamic models of two representative HP installations, of different size and design temperatures. The considered configurations include a 14 kW R134a one-stage cycle and an 800 kW two-stage ammonia heat pump. Based on the design point COP estimation, and five linearized off-design contributions, the performance estimation of COP showed a maximum deviation of 8 %.
Original languageEnglish
Title of host publicationProceedings of the 25th IIR International Congress of Refrigeration
Number of pages8
PublisherInternational Institute of Refrigeration
Publication date2019
Article number648
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)

Bibliographical note

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


  • Heat pumps
  • Compressors
  • COP estimation
  • Performance modelling


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