Debye Equation of State for 3HE from 0.01 to 20 K

Huang, Yonghua; Chen, G. B.; Arp, V.

doi:10.1063/1.2202498

Cited by 4 publications

(19 citation statements)

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“…Also, c P is no longer 5/2 R, but is a function of T and P (FIGURE 3). For the same pressure the peak of specific heat anomaly occurs at about the same temperature for both 3 He and 4 He. The size of the anomaly is smaller for 3 He than for 4 He.…”

Section: Real Gas Propertiesmentioning

confidence: 78%

“…This was shown analytically for 4 He [1]. Since the critical point of 3 He occurs at lower temperature and pressure than 4 He, pulse tube coolers using 3 He are expected to reach lower temperatures than those using 4 He. This has been demonstrated in practice [2][3].…”

Section: Introductionmentioning

confidence: 99%

“…Here, the real gas thermodynamics in pulse tube cryocoolers will be analyzed through the use of these quantities. The approach has been previously described for ideal and non-ideal pulse tubes [7][8] and for 4 He real gas effects in ideal pulse tube cryocoolers [1]. The basis of our approach is the thermodynamics of an open system.…”

Section: Approachmentioning

confidence: 99%

“…The approach used here assumes that the system (FIGURE 2) is ideal except for the gas properties, which are the real gas properties. The gas properties were taken from the 3 He [4] and 4 He [7] thermophysical models. In ideal, lossless components, S gen = 0.…”

Section: Approachmentioning

confidence: 99%

“…A recently developed model for the thermophysical properties of 3 He [4] allows the low temperature shift in performance to be shown analytically. This paper reports the results of this analysis for the case of an ideal pulse tube cryocooler over the pressure range of 0.3-2 MPa using 3 He as the working fluid and compares the 3 He results to the previous 4 He analysis.…”

Section: Introductionmentioning

confidence: 99%

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PERFORMANCE LIMITS OF PULSE TUBE CRYOCOOLERS USING [sup 3]HE

Kittel¹

2008

AIP Conference Proceedings

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The enthalpy, entropy, and exergy flows resulting from the real gas effects of 3 He in ideal pulse tube cryocoolers are described. The discussion follows a previous description of the real gas effects of 4 He in ideal pulse tube cryocoolers and makes use of a recently developed model of the thermophysical properties of 3 He. This model is used to describe how the thermodynamic flows are affected by real gas phenomena of 3 He and compares these effects to similar effects for 4 He. The analysis was done over the pressure range 0.3-2 MPa and temperatures down to 1 K. At 2 MPa there is almost no difference in the cooling power between 3 He and 4 He. At lower pressures, using 3 He is advantageous. There is a 1-2 K reduction in the 3 He cooling power vs. temperature curves compared to those for 4 He in the 0.3-1 MPa range.

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Section: Real Gas Propertiesmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Approachmentioning

confidence: 99%

Section: Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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PERFORMANCE LIMITS OF PULSE TUBE CRYOCOOLERS USING [sup 3]HE

Kittel¹

2008

AIP Conference Proceedings

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Modification of degradation behavior of magnesium alloy by IBAD coating of calcium phosphate

Yang

Jiao

Cui

et al. 2008

Surface and Coatings Technology

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Optimization Calculations for a 30 Hz, 4 K Regenerator With Helium-3 Working Fluid

Radebaugh¹,

Huang²,

O'Gallagher³

et al. 2010

AIP Conference Proceedings

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The NIST numerical software, REGEN3.3, which incorporates both He-4 and He-3 properties, was used to calculate the losses and second law efficiencies of 4 K regenerators operating at 30 Hz. Operating parameters, such as average pressure, pressure ratio, and warm-end temperature were varied to investigate the effect of non-ideal gas properties. Regenerator parameters such as matrix material and shape, hydraulic diameter, and regenerator geometry were varied to investigate losses due to non-ideal regenerator behavior. The results show that He-3 can increase the regenerator efficiency by a factor of at least two compared to a regenerator optimized for He-4. A layered regenerator of gadolinium oxysulfate (GOS) at the cold end and ErPr at the warm end is the best of many material combinations. A regenerator with parallel holes of about 20 % porosity showed only slight improvement over one with packed spheres. The regenerator warm-end temperature has little effect on its efficiency for temperatures below 35 K and pressures of 1.0 MPa and above. An optimized 4 K He-3 regenerator uses layered GOS and ErPr with the warm end at about 30 K and an average pressure of about 1.0 MPa. With those optimum conditions a reduced regenerator loss of 0.36 and a regenerator second law efficiency of 25 % are achieved.

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Debye Equation of State for 3HE from 0.01 to 20 K

Cited by 4 publications

References 0 publications

PERFORMANCE LIMITS OF PULSE TUBE CRYOCOOLERS USING [sup 3]HE

PERFORMANCE LIMITS OF PULSE TUBE CRYOCOOLERS USING [sup 3]HE

Modification of degradation behavior of magnesium alloy by IBAD coating of calcium phosphate

Optimization Calculations for a 30 Hz, 4 K Regenerator With Helium-3 Working Fluid

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