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Novel graphical representation of the potential to reduce work requirement of a vapor compression cycle on a temperature–entropy diagram for refrigeration and heat pump cycles.

Auteurs : YAMADA H., SAIKAWA M.

Type d'article : Article de la RIF

Résumé

As an alternative to exergy analysis, the potential for reducing the work requirement of a vapor compression cycle can be evaluated by comparing it with an ideal Lorenz cycle operating under identical heat sink, heat source temperature profiles, and heat load. Here, the vapor compression cycle is defined as a theoretical cycle comprising irreversible compression, isobaric cooling, isenthalpic expansion, and isobaric heating. Conventionally, this potential, quantified as the additional work required by the theoretical cycle relative to the ideal
Lorenz cycle, is represented as an area on a temperature–entropy (T–S) diagram. However, existing methods fail to distinguish the individual contributions of the four processes as distinct areas on the T–S diagram. This study introduces a novel approach for visualizing these contributions, delineating four separate areas on the T–S diagram for refrigeration and heat pump cycles. Each area represents a potential reduction in work that can be achieved by optimizing the respective process. To demonstrate applicability, the proposed method is applied to a comparative analysis of theoretical cycles for four refrigerants with different normal boiling points (R744, R32, R454C, and R1234yf) across four application scenarios (cooling, heating, refrigeration, and water heating). This application clarifies how refrigerant selection affected the coefficient of performance (COP). In addition, the method’s applicability to two‑stage compression and vapor‑injection cycles is further investigated. This graphical representation enables visual identification of the process with the most significant potential for work
reduction and provides insights into the impact of refrigerant selection on the COP.

Documents disponibles

Format PDF

Pages : 29 p.

Disponible

  • Prix public

    20 €

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Détails

  • Titre original : Novel graphical representation of the potential to reduce work requirement of a vapor compression cycle on a temperature–entropy diagram for refrigeration and heat pump cycles.
  • Identifiant de la fiche : 30034781
  • Langues : Anglais
  • Sujet : Technologie
  • Source : International Journal of Refrigeration - Revue Internationale du Froid - vol. 185
  • Date d'édition : 05/2026
  • DOI : http://dx.doi.org/10.1016/j.ijrefrig.2026.02.007

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