Miniature Joule-Thomson Cryocooling

Maytal, Ben-Zion; Pfotenhauer, John M.

doi:10.1007/978-1-4419-8285-8

Cited by 35 publications

(19 citation statements)

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“…It is often suggested that the fluid that leaves the cold heat exchanger (at point f) is saturated vapor (see, e.g., Ref. [5] Fig.3.3, [11] Fig. 1, [12] Fig.…”

Section: Finite Heat Loadmentioning

confidence: 99%

“…Basically cooling, obtained by the JT process, is very simple and is widely applied in household refrigerators, air conditioners, cryocoolers, and as the final stage of liquefiers. They can be miniaturized [3][4][5], but they are also used on a very large scale in the liquefaction of natural gas [6,7]. Even though this way of cooling is more than 160 years old published measurements of the cooling power of JT cryocoolers are rare.…”

Section: Introductionmentioning

confidence: 99%

“…For example, Ref. [5] does not contain one single plot of the measured cooling performance of a JT cooler. As a consequence, system properties discussed in this paper, such as in Fig.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Basics of Joule–Thomson Liquefaction and JT Cooling

Waele

2017

J Low Temp Phys

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“…It is often suggested that the fluid that leaves the cold heat exchanger (at point f) is saturated vapor (see, e.g., Ref. [5] Fig.3.3, [11] Fig. 1, [12] Fig.…”

Section: Finite Heat Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Basics of Joule–Thomson Liquefaction and JT Cooling

Waele

2017

J Low Temp Phys

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“…Small 30 watt refrigeration units of this type have been commercially available since the mid 1990's and are currently being applied to CCD camera refrigeration [7]. A recent review of this refrigeration technology can be found in [8]. The technology is attractive for refrigeration of telescope cameras because it avoids both the bulky vacuum insulated cryogenic transfer lines and cryogenic pumps needed for LN 2 systems as well as the mechanical vibration and weight of Gifford-McMahon and Pulse Tube cryocoolers.…”

Section: Joule-thomson Mixed Refrigerantmentioning

confidence: 99%

The LSST camera 500-watt -130°C mixed refrigerant cooling system

Bowden

Little³

et al. 2014

Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation

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The LSST Camera has a higher cryogenic heat load than previous CCD telescope cameras due to its large size (634 mm diameter focal plane, 3.2 Giga pixels) and its close coupled front-end electronics operating at low temperature inside the cryostat. Various refrigeration technologies are considered for this telescope/camera environment. MMR-Technology's Mixed Refrigerant technology was chosen. A collaboration with that company was started in 2009. The system, based on a cluster of Joule-Thomson refrigerators running a special blend of mixed refrigerants is described. Both the advantages and problems of applying this technology to telescope camera refrigeration are discussed. Test results from a prototype refrigerator running in a realistic telescope configuration are reported. Current and future stages of the development program are described.

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“…Micro Cryogenic Coolers (MCC) based on the Joule-Thomson method are of interest because of their high volumetric cooling capacity and consequently have been the subject of several investigations and development [1]. There are two general types of J-T cryogenic refrigerators.…”

Section: Introductionmentioning

confidence: 99%

Second-Law Analysis of a Cascade Joule-Thomson Microcooler

Razani

Fraser

Dodson

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Cascade Joule-Thomson Microcoolers have been proposed in literature in which different compressors with low values of pressure ratio of order four using different working fluids are anticipated to drive the microcooler. A cascade of five stages is expected to provide cooling at a load temperature of 150 K. In this study a second-law analysis of such a microcooler is performed to quantify the effect of important design parameters representing the basic components and processes of the microcooler on its performance. The effects of several important design parameters including the effectiveness of all heat exchangers as well as the effect of possible pressure drop in the recuperative heat exchanger on cooling power and the exergetic efficiency of the microcooler are obtained. The inefficiency of the compressors is included using an exergetic efficiency parameter for the compressors. The heat transfer from each stage to other stages is modelled using an effectiveness parameter for the heat exchangers that can be varied to investigate their influence on cooling power and the efficiency of the microcooler.

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Miniature Joule-Thomson Cryocooling

Cited by 35 publications

References 0 publications

Basics of Joule–Thomson Liquefaction and JT Cooling

Basics of Joule–Thomson Liquefaction and JT Cooling

The LSST camera 500-watt -130°C mixed refrigerant cooling system

Second-Law Analysis of a Cascade Joule-Thomson Microcooler

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