Binary mixed-refrigerants for steady cooling temperatures between 80 K and 150 K with Joule–Thomson cryocoolers

Tzabar, N.

doi:10.1016/j.cryogenics.2014.09.009

Cited by 23 publications

(6 citation statements)

References 9 publications

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“…Previous research [4] showed that mixtures of nitrogen with hydrocarbons can improve the performance of a carbon-based sorption compressor. Therefore, a gas property is selected with a large difference between nitrogen and hydrocarbons.…”

Section: In-flow Composition Measurement 31 Operating Principlementioning

confidence: 99%

“…As shown in earlier studies, the efficiency of Joule-Thomson (JT) coolers can be significantly improved by using a gas mixture instead of a pure gas [1,2,3]. The application of gas mixtures has been researched in combination with mechanical compressors to offer higher cold-stage efficiencies at lower pressure ratios [4,5]. If vibration-free cooling is desired, which for instance is beneficial for cooling optical detectors, then thermally-driven sorption-based compressors provide an attractive alternative compared to mechanical compressors [6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

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In-flow measurement of the composition of a binary gas mixture

Tolboom

Vermeer

Holland

et al. 2022

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

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The performance of many cryocoolers that utilize the Joule-Thomson effect can be improved by using a gas-mixture as the working fluid. This paper presents a measurement setup to characterize a sorption compressor operating with a binary mixture. The composition of the binary mixture delivered by the sorption compressor is determined in-flow by correlating the outputs of a Coriolis flow meter and a thermal mass-flow meter. Based on this method, the composition of a binary mixture was measured continuously with an error of ±0.02. Multiple sorption cycles with three different mixtures of ethane and nitrogen using the same compressor were measured, allowing for the observation of the dynamic desorption behavior of a mixture.

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Section: In-flow Composition Measurement 31 Operating Principlementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-flow measurement of the composition of a binary gas mixture

Tolboom

Vermeer

Holland

et al. 2022

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

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show abstract

“…In recent years, adsorption refrigeration has been also proposed for aerospace applications thanks to the absence of an electrical compressor, making these systems vibration-free. Tzabar [7,8] developed a Joule-Thomson cryocooler able to work in the range of temperatures interesting for satellites, independent from any active control and highly reliable. Potential applications include the Cube Sats, a new generation of satellites used for monitoring the Earth conditions.…”

Section: Introductionmentioning

confidence: 99%

Ammonia/Ethanol Mixture for Adsorption Refrigeration

2020

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Adsorption refrigeration has become an attractive technology due to the capability to exploit low-grade thermal energy for cooling power generation and the use of environmentally friendly refrigerants. Traditionally, these systems work with pure fluids such as water, ethanol, methanol, and ammonia. Nevertheless, the operating conditions make their commercialization still unfeasible, especially owing to safety and cost issues as a consequence of the working pressures, which are higher or lower than 1 atm. The present work represents the first thermodynamic insight in the use of mixtures for adsorption refrigeration and aims to assess the performance of a binary system of ammonia and ethanol. According to the Gibbs’ phase rule, the addition of a component introduces an additional degree of freedom, which allows to adjust the pressure of the system varying the composition of the mixture. The refrigeration process was simulated with isothermal- isochoric flash calculations to solve the phase equilibria, described by the Peng-Robinson-Stryjek-Vera (PRSV) equation of state for the vapor and liquid phases and by the ideal adsorbed solution theory (IAST) and the multicomponent potential theory of adsorption (MPTA) for the adsorbed phase. In operating condenser and evaporator, pressure levels around atmospheric pressure can be achieved using an ammonia/ethanol mixture with a mole fraction of ethanol in the range of 0.70−0.75. A good agreement in the predictions of the adsorbed phase composition was also reported using the IAST and the MPTA methods.

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“…However, calculation of dephlegmator requires further studies. Tzabar [30] conducted an analytical method to calculate the cooling temperature and cooling power of the MRJT cycle. Tzabar and Grossman [31] also developed a fundamental analysis of mixed gases sorption compressor and investigated two binary mixtures, namely, nitrogen-methane and nitrogen-ethane, for mixedgas adsorption.…”

Section: Introductionmentioning

confidence: 99%