A review on current status of capacity control techniques for two-phase ejectors

Paride Gullo*, Martin Ryhl Kærn, Michal Haida, Jacek Smolka, Stefan Elbel

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    The adoption of highly efficient vapour-compression heating, ventilation, air conditioning and refrigeration (HVAC&R) systems is compulsory to achieve a low-carbon society. Expansion work recovery using a two-phase ejector is widely recognized as one of the most promising measures to improve the energy efficiency of HVAC&R units. This holds true for all operation conditions provided that an effective capacity control technique is implemented. In this work a thorough critical review on the current status of the presently available capacity control strategies for two-phase ejectors was carried out. In addition, their pros and cons as well as the comparison of their performance were reported. It was concluded that two-phase ejectors can be properly capacity controlled in large- and medium-scale vapour-compression units. However, a suitable capacity control mechanism for small-scale vapour-compression solutions still requires a major breakthrough and is being intensively discussed among experts in the field.
    Original languageEnglish
    JournalInternational Journal of Refrigeration
    Pages (from-to)64-79
    Publication statusPublished - 2020

    Bibliographical note

    ECO2-RAPJECT project, whose grant no is GA 844924


    • Capacity control
    • Expansion work recovery
    • Multi-ejector
    • Needle ejector
    • Vapour-compression system
    • Vortex ejector


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