The Effect of Phase-shifting Mechanisms on the Energy and Exergy Flow in Pulse Tube Refrigerators

Razani, A.; Dodson, C.; Flake, B.; Roberts, T.

doi:10.1063/1.2202582

Cited by 2 publications

(2 citation statements)

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“…For the most part, the models used for the analysis of pulse tube refrigerator are phasor type [5,8], linear network type [9] and one-dimensional gas-dynamics type [10,11]. It is only more recently that attempts have been made to use the full set of compressible equations with the help of fluid dynamics packages [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model

Ashwin

Narasimham

Jacob

2010

Applied Thermal Engineering

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High frequency, miniature, pulse tube cryocoolers are extensively used in space applications because of their simplicity. Parametric studies of inertance type pulse tube cooler are performed with different length-to-diameter ratios of the pulse tube with the help of the FLUENT ® package. The local thermal non-equilibrium of the gas and the matrix is taken into account for the modeling of porous zones, in addition to the wall thickness of the components. Dynamic characteristics and the actual mechanism of energy transfer in pulse are examined with the help of the pulse tube wall time constant. The heat interaction between pulse tube wall and the oscillating gas, leading to surface heat pumping, is quantified. The axial heat conduction is found to reduce the performance of the pulse tube refrigerator. The thermal non-equilibrium predicts a higher cold heat exchanger temperature compared to thermal equilibrium. The pressure drop through the porous medium has a strong non-linear effect due to the dominating influence of Forchheimer term over that of the linear Darcy term at high operating frequencies. The phase angle relationships among the pressure, temperature and the mass flow rate in the porous zones are also important in determining the performance of pulse tube refrigerator.

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Section: Introductionmentioning

confidence: 99%

CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model

Ashwin

Narasimham

Jacob

2010

Applied Thermal Engineering

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“…Kittel [27] has also discussed the effects of a variety of loss mechanisms in the various components on the enthalpy flow, entropy generation and exergy flows of BPTC, OPTC and IPTC. Razani et al [28] have compared the energy and exergy flow in three different types of PTCs viz. OPTC, DIPTC and IPTC based on a first-order model.…”

Section: Introductionmentioning

confidence: 99%

Exergy destruction in the double inlet pulse tube cryocooler (DIPTC): A parametric study

Dash

Nandi

Das

2009

Int. J. Energy Res.

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SUMMARYIn this paper the exergy analysis of a double inlet pulse tube cryocooler (DIPTC) has been performed. The pulsating mass flow has been modelled by a sinusoidal approximation using phasor analysis. The corresponding values were used to find out the average exergy flow through and exergy destructions in various components. The effect of different parameters on the exergy flow and exergy destruction has been studied over a large range of parameters. The parameters considered here are frequency, cold end temperature, valve coefficients of orifice valve and double inlet (DI) valve, system average pressure and initial phase angle of compressor outlet pressure. A higher sensitivity of the losses in a DIPTC system is observed with operating frequency and initial phase angle of compressor pressure within some specific range of these parameters. It was observed that for a DIPTC system there is a critical cold end temperature below which the losses are significant and also there exists a critical frequency below which there will practically be no cooling. It was found that the losses in the DIPTC are more sensitive to the orifice valve opening in comparison to the DI valve opening. A Grassmann diagram has also been constructed for the DIPTC.

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The Effect of Phase-shifting Mechanisms on the Energy and Exergy Flow in Pulse Tube Refrigerators

Cited by 2 publications

References 3 publications

CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model

CFD analysis of high frequency miniature pulse tube refrigerators for space applications with thermal non-equilibrium model

Exergy destruction in the double inlet pulse tube cryocooler (DIPTC): A parametric study

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