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Article | REF: BE9732 V1

Theory of refrigerating machines - Mechanical compression machines. Multistage cycles

Authors: Maxime DUMINIL, Jean-Pierre DOMBLIDES

Publication date: April 10, 2013, Review date: October 16, 2019 | Lire en français

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    Overview

    ABSTRACT

    Among compression refrigeration cycles, multistage cycles and in particular two-stage cycles are used in various domains: freezing in general, the chemical industry and lyophilization. After providing general information on these cycles, this article focuses on two-stage cycles and in particular partial injection cycles, total injection cycles and economizer cycles. The choice of the intermediate pressure is essential as it impacts the energetic consumption of the two stages. The production of very low temperatures, CO2 cascade cycles associated with other fluids and the various cycles using zeotropic blends are presented.

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    AUTHORS

    • Maxime DUMINIL: Former professor at the French Institute of Industrial Refrigeration and Climatic Engineering (CNAM) - Former professor at École Centrale de Paris - Honorary expert to the Paris Court of Appeal

    • Jean-Pierre DOMBLIDES: Senior lecturer at the Conservatoire National des Arts et Métiers and IFFI - French Institute for Industrial Refrigeration and HVAC - Chairman of the Training Committee of the French Refrigeration Association (AFF)

     INTRODUCTION

    A good knowledge of compression refrigeration cycles is of major importance, which justifies the development reserved for them.

    After giving a general overview of refrigeration systems in the [BE 9 730] dossier, the [BE 9 731] dossier looks at single-stage mechanical compression refrigeration cycles.

    This dossier [BE 9 732] is devoted to multi-stage compression refrigeration cycles and, in particular, two-stage machines found in fields as varied as general freezing, the chemical industry and freeze-drying. A study of cascade refrigeration cycles completes the text.

    The following [BE 9 733] dossier focuses on active fluids in compression machines: refrigerants and their impact on the environment.

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