Ibrahim KaracayliLutfiye AltayA. Hepbasli2025-10-06202317428300, 174282971742-82971742-830010.1504/IJEX.2023.134611https://www.scopus.com/inward/record.uri?eid=2-s2.0-85179127037&doi=10.1504%2FIJEX.2023.134611&partnerID=40&md5=cfb52eb69af9aec25b7a0aecec6e65cehttps://gcris.yasar.edu.tr/handle/123456789/8511The main objective of this study is to assess both energetically and exergetically the performance of a novel auto-cascade refrigeration (NACR) cycle enhanced by an internal heat exchanger using R290/R170. In contrast to the ACR cycle with a –60°C evaporation temperature the NACR cycle displays a COP increase of 140.78% and a 148.67% improvement in exergy efficiency. Additionally there is a notable decrease of 13.77% in compressor discharge temperature. For an evaporation temperature of –55°C the NACR cycle achieves a COP of 0.403 and an exergy efficiency of 14.61% with the compressor discharge temperature registering at 126.60°C. © 2023 Elsevier B.V. All rights reserved.EnglishAcr, Auto-cascade Refrigeration, Coefficient Of Performance, Cop, Exergy Analysis, Refrigeration, Second Law Efficiency, Ultra-low Temperature, Efficiency, Evaporation, Exergy, Low Temperature Effects, Temperature, Acr, Auto-cascade Refrigeration, Coefficient Of Performance, Cop, Evaporation Temperature, Exergy Analysis, Exergy Efficiencies, Refrigeration Cycles, Second Law Efficiencies, Ultra Low Temperatures, RefrigerationEfficiency, Evaporation, Exergy, Low temperature effects, Temperature, ACR, Auto-cascade refrigeration, Coefficient of Performance, COP, Evaporation temperature, Exergy Analysis, Exergy efficiencies, Refrigeration cycles, Second law efficiencies, Ultra low temperatures, RefrigerationArticle