High temperature absorption compression heat pump for industrial waste heat

Lars Reinholdt*, B. Horntvedt, S. R. Nordtvedt, Brian Elmegaard, Jonas Kjær Jensen, Thor L. Lemminger

*Corresponding author for this work

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


    Heat pumps are currently receiving extensive interest because they may be able to support the integration of large shares of fluctuating electricity production based on renewable sources, and they have the potential for the utilization of low temperature waste heat from industry. In most industries, the needed temperature levels often range from 100°C and up, but until now, it has been quite difficult to find heat pump technologies that reach this level, and thereby opening up the large-scale heat recovery in the industry. Absorption compression heat pumps can reach temperatures above 100°C, and they have proved themselves a very efficient and reliable technology for applications that have large temperature changes on the heat sink and/or heat source. The concept of Carnot and Lorenz efficiency and its use in the analysis of system integration is shown. A 1.25 MW system having a Carnot efficiency higher than 82% by the better temperature match of the process to the heat sink and source is reported. Another major benefit of using ammonia and water as working pair is the possibility of reaching quite high temperatures at a significantly lower operating pressure, which makes it possible to reach a temperature of 108°C using standard industrial refrigeration equipment as described in the three included realized systems.

    Original languageEnglish
    Title of host publicationProceedings of the 12th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2016)
    VolumePart F126956
    PublisherInternational Institute of Refrigeration
    Publication date2016
    Article number1175
    ISBN (Electronic)9782362150180
    Publication statusPublished - 2016
    Event12th IIR Gustav Lorentzen Natural Working Fluids Conference (GL 2016) - Edinburgh, United Kingdom
    Duration: 21 Aug 201624 Aug 2016


    Conference12th IIR Gustav Lorentzen Natural Working Fluids Conference (GL 2016)
    Country/TerritoryUnited Kingdom


    • Absorption-compression
    • Heat pump
    • High temperature
    • Lorenz COP
    • Process integration


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