Elevated-pressure mixed-coolants Joule–Thomson cryocooling

“…The ozone layer destruction phenomenon provoked the discussion on replacing CFC-based refrigerants, and many studies have been conducted to use multicomponent refrigerants in domestic and industrial systems. Relevant studies include those by Steed, Lamb et al, and Duvedi et al Besides, many studies have focused on using mixed refrigerants to reach low temperatures. , In all of the mentioned studies, the mathematical programming approach has been used to determine the percentage of the optimal refrigerant composition. Furthermore, in a refrigerant process with a preset layout, these studies focused on maximizing the refrigerant composition percent and the system’s operating pressures.…”

Section: Different Methods To Improve the Performance Of Hydrogen Liq...mentioning

confidence: 99%

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

et al. 2023

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The main challenges of liquid hydrogen (H2) storage as one of the most promising techniques for large-scale transport and long-term storage include its high specific energy consumption (SEC), low exergy efficiency, high total expenses, and boil-off gas losses. This article reviews different approaches to improving H2 liquefaction methods, including the implementation of absorption cooling cycles (ACCs), ejector cooling units, liquid nitrogen/liquid natural gas (LNG)/liquid air cold energy recovery, cascade liquefaction processes, mixed refrigerant systems, integration with other structures, optimization algorithms, combined with renewable energy sources, and the pinch strategy. This review discusses the economic, safety, and environmental aspects of various improvement techniques for H2 liquefaction systems in more detail. Standards and codes for H2 liquefaction technologies are presented, and the current status and future potentials of H2 liquefaction processes are investigated. The cost-efficient H2 liquefaction systems are those with higher production rates (>100 tonne/day), higher efficiency (>40%), lower SEC (<6 kWh/kgLH2), and lower investment costs (1–2 $/kgLH2). Increasing the stages in the conversion of ortho- to para-H2 lowers the SEC and increases the investment costs. Moreover, using low-temperature waste heat from various industries and renewable energy in the ACC for precooling is significantly more efficient than electricity generation in power generation cycles to be utilized in H2 liquefaction cycles. In addition, the substitution of LNG cold recovery for the precooling cycle is associated with the lower SEC and cost compared to its combination with the precooling cycle.

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“…Phase behavior data at temperatures and at pressures from are presented for D, L-lactide in hydro fluorocarbon solvents: R32, R23 and R134a. The liquid refrigerant supply, different cascade heat exchangers, elevatedpressure mixed-coolants, have effect on the performance parameters (Gurudath and Venkatarathnam, 2010;Maytal et al, 2006;Gong et al, 2002). Other factors will influence the performance: the ejector is used to recover some available work to increase the compressor suction pressure (Walimbe et al, 2010;Byung-Chul, 2003).…”

Section: Introductionmentioning

confidence: 99%

The Relation of Performance Parameters for a 150K Auto-Cascade Refrigeration System

Nie¹,

Shen²,

Zhang³

et al. 2013

RJASET

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The performance parameters of a single compressed and four-stage segregating auto-cascade refrigeration system were developed in this study. The temperature of the cryogenic tank went down relatively slow with the evaporating temperature and the refrigerant temperature for W. When the state of system is steady, the suction pressure of the compressor is 0.3 MPa, the discharge pressure is decreased slowly. When the temperature of cryogenic tank is below zero 118 °C, the discharge pressure is 1.34 MPa. The lowest temperature could reach-18°C and the refrigeration capacity was about 7 W.

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Elevated-pressure mixed-coolants Joule–Thomson cryocooling

Cited by 20 publications

References 11 publications

Joule–Thomson inversion curves of mixtures by molecular simulation in comparison to advanced equations of state: Natural gas as an example

Joule–Thomson inversion curves of mixtures by molecular simulation in comparison to advanced equations of state: Natural gas as an example

Strategies To Improve the Performance of Hydrogen Storage Systems by Liquefaction Methods: A Comprehensive Review

The Relation of Performance Parameters for a 150K Auto-Cascade Refrigeration System

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