Experimental investigation and theoretical analysis of oil circulation rates in ejector cooling cycles

Zhu, Jingwei; Botticella, Francesco; Elbel, Stefan

doi:10.1016/j.energy.2018.05.152

Cited by 21 publications

(2 citation statements)

References 29 publications

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“…The study of non-ejector components is a raising topic of research and two areas are identified: oil recirculation and evaporator design criteria. The former was addressed by Zhu et al [2], who mentioned that a precise description of oil circulation is needed to avoid the reduction of performance and the compressor reliability. The latter was discussed by Lawrence and Elbel [3], who proposed a "pressure drops/heat transfer model" evaporator model and, subsequently, applied it to different cycle configurations and refrigerants (R134a, ammonia).…”

mentioning

confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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mentioning

confidence: 99%

Ejectors on the cutting edge: The past, the present and the perspective

Besagni

2019

Energy

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“…Zhu et al [174] investigated experimentally the issue of the oil circulation in a transcritical CO 2 EERC. Significantly higher oil circulation rate was observed at the evaporator inlet of the ejector cycle than at the high-pressure side.…”

Section: Eerc Experimental Studiesmentioning

confidence: 99%

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 2: Two-Phase Ejectors

et al. 2019

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Two-phase ejectors play a major role as refrigerant expansion devices in vapor compression systems and can find potential applications in many other industrial processes. As a result, they have become a focus of attention for the last few decades from the scientific community, not only for the expansion work recovery in a wide range of refrigeration and heat pump cycles but also in industrial processes as entrainment and mixing enhancement agents. This review provides relevant findings and trends, characterizing the design, operation and performance of the two-phase ejector as a component. Effects of geometry, operating conditions and the main developments in terms of theoretical and experimental approaches, rating methods and applications are discussed in detail. Ejector expansion refrigeration cycles (EERC) as well as the related theoretical and experimental research are reported. New and other relevant cycle combinations proposed in the recent literature are organized under theoretical and experimental headings by refrigerant types and/or by chronology whenever appropriate and systematically commented. This review brings out the fact that theoretical ejector and cycle studies outnumber experimental investigations and data generation. More emerging numerical studies of two-phase ejectors are a positive step, which has to be further supported by more validation work.

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