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Experimental Investigation of the Effect of a Recuperative Heat Exchanger and Throttles Opening on a CO 2 /Isobutane Autocascade Refrigeration System

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  • Michał Sobieraj

    (Faculty of Building Services, Hydro and Environmental Engineering, Warsaw University of Technology, 20 Nowowiejska Street, 00-653 Warsaw, Poland)

Abstract

An experimental evaluation of an autocascade refrigeration (ACR) system was carried out. A zeotropic mixture of isobutane and CO 2 was employed as a working fluid in an autocascade refrigeration (ACR) system. An experimental system was designed and built to study the influence of the recuperative heat exchanger (RHX) and openings of the throttle valves on the system performance. The use of RHX facilitated the condensation process and improved the cycle characteristics. The working mass concentration of CO 2 was higher, as it was closer to the nominal concentration and the discharge pressure was lower by 19% to even 39% when the RHX was employed in the system. An increase of up to 20% in the coefficient of performance (COP) was observed. Furthermore, the effects of the openings of the throttle valves on the system characteristics were studied. The change in the openings of the expansion valves affected the mass flows and the working mixture composition. The working CO 2 mass fraction increased with higher openings of the evaporator throttle. The subcooling degree of liquid CO 2 -rich refrigerant increased with higher openings of the expansion valve under the phase separator. The results of the present work should be helpful for design and optimization of autocascade systems working with natural and synthetic refrigerants.

Suggested Citation

  • Michał Sobieraj, 2020. "Experimental Investigation of the Effect of a Recuperative Heat Exchanger and Throttles Opening on a CO 2 /Isobutane Autocascade Refrigeration System," Energies, MDPI, vol. 13(20), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:20:p:5285-:d:426496
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    References listed on IDEAS

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    1. Laura Nebot-Andrés & Daniel Calleja-Anta & Daniel Sánchez & Ramón Cabello & Rodrigo Llopis, 2019. "Thermodynamic Analysis of a CO 2 Refrigeration Cycle with Integrated Mechanical Subcooling," Energies, MDPI, vol. 13(1), pages 1-17, December.
    2. Michal Haida & Rafal Fingas & Wojciech Szwajnoch & Jacek Smolka & Michal Palacz & Jakub Bodys & Andrzej J. Nowak, 2019. "An Object-Oriented R744 Two-Phase Ejector Reduced-Order Model for Dynamic Simulations," Energies, MDPI, vol. 12(7), pages 1-24, April.
    3. Bai, Tao & Yan, Gang & Yu, Jianlin, 2018. "Experimental research on the pull-down performance of an ejector enhanced auto-cascade refrigeration system for low-temperature freezer," Energy, Elsevier, vol. 157(C), pages 647-657.
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    Cited by:

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    4. Konrad, Mary Elizabeth & MacDonald, Brendan D., 2023. "Cold climate air source heat pumps: Industry progress and thermodynamic analysis of market-available residential units," Renewable and Sustainable Energy Reviews, Elsevier, vol. 188(C).

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    More about this item

    Keywords

    CO 2 ; isobutane; R744; autocascade; natural refrigerants;
    All these keywords.

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