Low-Temperature Nitrogen Ejector Performance

Daney, David; McConnell, P. M.; Strobridge, T. R.

doi:10.1007/978-1-4684-3111-7_58

Cited by 5 publications

(6 citation statements)

References 4 publications

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“…Nicholds [32] presented a JT type cooling apparatus, in which an ejector was adopted at the warm end of a JT cooler to reduce the pressure in the evaporator of the cooler. Daney et al [33] added an ejector to a JT cooler with nitrogen gas as the working fluid. An assemble type ejector was used to characterize the performance of ejectors with different dimensions.…”

Section: Utilization Of Ejectors In Jt Cryocoolersmentioning

confidence: 99%

Progress and challenges in utilization of ejectors for cryogenic cooling

Cao

Brake

2020

Applied Thermal Engineering

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Section: Utilization Of Ejectors In Jt Cryocoolersmentioning

confidence: 99%

Progress and challenges in utilization of ejectors for cryogenic cooling

Cao

Brake

2020

Applied Thermal Engineering

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“…Therefore, real fluid properties should be used in the cryogenic ejector model. In this paper, the basic calculation process follows the models of the helium ejector (Daney et al, 1973;Johnson and Daggett, 1987;Kerney, 1984, 1986). The proposed model in this paper is not focused on the accuracy but concentrated on the simplicity such that the model can be applied not only for the single-phase operation but also for the two-phase ejector operation.…”

Section: Modeling Of Ejectormentioning

confidence: 99%

“…The idea of using ejector to increase the thermodynamic efficiency of cryogenic refrigeration systems (Daney et al, 1973;Johnson and Daggett, 1987;Kerney, 1984, 1986;Pirtle et al, 1982) have been proposed, however, most of the previous results were qualitative analysis with the preliminary test results of ejector itself. Recently, Yu et al suggested a modified JT refrigeration cycle using ejector.…”

Section: Introductionmentioning

confidence: 99%

Investigation of ejector-equipped Joule–Thomson refrigerator operating below 77 K

Lee

Baek

et al. 2017

International Journal of Refrigeration

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The lowest attainable refrigeration temperature of a nitrogen based Joule-Thomson refrigerator is generally limited to 77 K since the compressor suction pressure is usually higher than atmospheric pressure. The Joule-Thomson process with an ejector is proposed to achieve a refrigeration temperature as low as 68 K by adjusting the evaporation pressure down to 28 kPa and boosting the return stream pressure up to 147 kPa. A one-dimensional numerical model is developed to predict the performance of the ejector at cryogenic temperature, and its accuracy is compared with experimental data. The analysis results show that the addition of the ejector in the Joule-Thomson refrigeration cycle increases up to 5 times the overall efficiency, where the maximum achievable COP and exergy efficiency are 0.0195 and 6.65%, respectively. Other featured advantages of the proposed Joule-Thomson refrigeration cycle with ejector are the simplicity of cycle, minimization of mechanical moving components, cost effectiveness, and high reliability compared to other cryogenic refrigeration methods using pumps or cold compressors in Joule-Thomson cycles.

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“…The most extensive low temperature performance data published reports work done at NBS with nitrogen as the working fluid [Daney, McConnell and Strobridge, 1973].…”

Section: Ejectorsmentioning

confidence: 99%

Helium heat transfer and refrigeration in support of magnetic fusion energy systems

Arp¹,

Brennan²,

Parrish³

et al. 1978

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This is the first year-end report on a program of studies on cryogenic engineering data in support of magnetic fusion energy projects. The report is divided into four parts: (1) an assessment of the cryogenic engineering data base used in the MFE community, and recommendations for needed work for that base, (2) experimental progress on measurement of transient helium heat transfer; the data are of importance for magnet stability analysis, (3) presentation of a newly developed general technique for analyzing the efficiency of helium refrigerators of any configuration and thereby identifying sources of inefficiency, and (4) progress towards setting up a data bank on refrigeration system reliability The technology assessment, item (1), is a revision of a preliminary version dated May 13, 1977, with inclusion of feedback received from both within and outside of the MFE community. Both the technology assessment. Part One, and the efficiency study. Part Three have been formatted for individual publication subsequent to this report. The technology assessment will be distributed to those who received copies of the preliminary edition. The efficiency study will be submitted for publication in Cryogenics. Because of our fairly recent publication on transient heat transfer (Part Two, appendix A) , it is appropriate to do further research in this field before writing it up for a follow-up publication in an outside journal.

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Low-Temperature Nitrogen Ejector Performance

Cited by 5 publications

References 4 publications

Progress and challenges in utilization of ejectors for cryogenic cooling

Progress and challenges in utilization of ejectors for cryogenic cooling

Investigation of ejector-equipped Joule–Thomson refrigerator operating below 77 K

Helium heat transfer and refrigeration in support of magnetic fusion energy systems

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