Thermodynamic evaluation of CO2 for ultra-low temperature refrigeration

Udroiu, Cosmin-Mihai; Mota-Babiloni, Adrián; Giménez-Prades, Pau; Barragán-Cervera, Ángel; Navarro-Esbrí, Joaquín

doi:10.1016/j.ecmx.2023.100446

Cited by 1 publication

(2 citation statements)

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“…The HTC ensures an evaporating temperature as low as −30 • C, while the LTC can achieve an evaporating temperature lower than −80 • C. Several cascade configurations have been investigated by Singh et al (2020) [13], Pan et al (2020) [12], and Udroiu et al (2023) [14]. The CRS produces a higher efficiency than the MRS. An ejector expansion CRS is the best option, and the inclusion of an ejector in the transcritical R744 cycle results in a performance enhancement of 38% compared to the same system without an ejector [14]. The oil-handling system in the CRS is simpler than in the MRS, as both cycles in the CRS have independent oil management systems.…”

Section: Cascade Refrigeration Systemsmentioning

confidence: 99%

“…In the cascade heat exchanger, the lower-cycle refrigerant condenses with the evaporation of the upper cycle. Pan et al (2020) [12], Singh et al (2020) [13], and Udroiu et al (2023) [14] performed a recent review and comparative analysis of the cascade system. The literature also suggests using an auto-cascade system for cost reduction and simplicity.…”

Section: Introductionmentioning

confidence: 99%

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Ultra-Low-Temperature Refrigeration Systems: A Review and Performance Comparison of Refrigerants and Configurations

Saeed,

Contiero,

Blust

et al. 2023

Energies

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During the last decade, many industrial and medical applications have shown a requirement for low-temperature-cooling usage (from −40 to −80 °C), which cannot be efficiently obtained via the conventional refrigeration systems usually employed for medium-temperature applications (from 0 to −40 °C). A proper ultra-low-temperature (ULT) refrigeration system design is essential to achieve the desired output. The performance can be maximised via the suitable selection of the configuration and refrigerant for a specific temperature range. This work contributes a detailed overview of the different systems and refrigerants used in ultra-low-temperature applications. Different systems, such as single-stage vapour compression, multi-stage, cascade, auto-cascade, and air refrigeration cycles, are presented and discussed. An energy analysis is then carried out for these systems identifying the optimal system design and refrigerant selection to achieve the highest performance. This paper aims to provide the reader with a comprehensive background through an exhaustive review of refrigeration systems suitable for ultra-low-temperature applications. The effectiveness of these systems is proven numerically, mainly based on the temperature level and purpose of the application.

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