A review on nearly isothermal compression technology

Kim, Timothy; Lee, Cheng-Yi; Hwang, Yunho; Radermacher, Reinhard

doi:10.1016/j.ijrefrig.2022.07.008

Cited by 16 publications

(6 citation statements)

References 42 publications

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“…Many previous studies about analysis of pseudo-isothermal process agreed that the partial adiabatic process cannot be isentropic [15,16]. However, all of them accepted that the isobaric heat transfer after the adiabatic process is ideal and the fluid is heated up/cooled down to the inlet temperature of turbine/compressor [18,19,20,21,22,23]. This paper strongly rejects this assumption.…”

Section: Proceedings Of the 8 Th International Exchange And Innovatio...mentioning

confidence: 78%

“…Computer aided design (CAD) constantly improves the design of turbomachinery. Compressors have cooled blades and core and turbines equipped with magnetic levitation bearings which limits the need for cooling of lubricants so the turbine can be heated up by an external heat source [17,18]. Helium seems to be a proper working fluid for the isothermal process.…”

Section: Proceedings Of the 8 Th International Exchange And Innovatio...mentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamic Analysis and Optimization of Helium Ericsson Power Cycle: A Novel Model for Pseudo-isothermal Compression and Expansion

Purjam¹,

Thu²,

Miyazaki³

2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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Nuclear energy has been considered as clean and environmentally friendly method of power production. With the emergence of Generation IV reactor, a new horizon was opened in nuclear technology. The invention of new materials and production processes and magnetic bearings, the new ideas for increasing the efficiency of nuclear power plants are being considered more feasible. In this paper the thermodynamic analysis of a Helium pseudo-isothermal expansion and compression power cycle which can be utilized to couple with a Very High-temperature Gas Reactor (VHTR) was performed. A novel thermodynamic modelling of estimating the isothermal process based on the irreversibility during the compression or expansion was done. The results show that isothermal process is not so far from the reality and the power cycle can exceed other designs in terms of efficiency.

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Section: Proceedings Of the 8 Th International Exchange And Innovatio...mentioning

confidence: 78%

Section: Proceedings Of the 8 Th International Exchange And Innovatio...mentioning

confidence: 99%

Thermodynamic Analysis and Optimization of Helium Ericsson Power Cycle: A Novel Model for Pseudo-isothermal Compression and Expansion

Purjam¹,

Thu²,

Miyazaki³

2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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“…As the compressed helium is cooled to ambient temperature by oil and water, therefore, both the suction and discharge temperatures of the compressor are equal to room temperature [ 21 ]. The volume flow of the compressor under standard condition is only related to the suction pressure.…”

Section: Numerical Model Of the Cryocoolermentioning

confidence: 99%

Numerical simulation and exergy analysis of a single-stage GM cryocooler

Zhao

Wang²,

Chao

et al. 2023

Heliyon

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“…The new geometry proposed in this paper is following a previous study proposed by Mahbod Heidary in his PhD thesis [4][5][6]. The use of imbricated cylindric fins in the stator part of the cylinder as well as on the sliding piston significantly increases the convective heat exchange on the surface in comparison to a classic piston/cylinder assembly and allows a compression process with a reduced elevation of the temperature inside the compression chamber [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Towards the Isothermal Gas Compression—A Novel Finned Piston-Cylinder with Increased Efficiency

Rufer

2024

Gases

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In this paper, a novel concept of a finned piston system is presented and analyzed in which the compression heat is continuously extracted from the compression chamber. The resulting compression characteristic moves in the direction of an isothermal process, reducing the temperature of the compressed fluid in the compression chamber and reducing the necessary mechanical work required to carry out the process. The finned piston concept consists in an integrated heat exchanger inside of the chamber that is constituted of imbricated flat fins placed on the stator part and on the mobile piston. The internal heat exchange on the surface is strongly increased in comparison with a classical piston/cylinder. The energetic performance of the new system is evaluated with the help of simulation. The pressures, forces, and temperature of the compressed gas are simulated as well as the mechanical work needed. The different curves are compared with the system’s adiabatic and isothermal characteristics.

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A review on nearly isothermal compression technology

Cited by 16 publications

References 42 publications

Thermodynamic Analysis and Optimization of Helium Ericsson Power Cycle: A Novel Model for Pseudo-isothermal Compression and Expansion

Thermodynamic Analysis and Optimization of Helium Ericsson Power Cycle: A Novel Model for Pseudo-isothermal Compression and Expansion

Numerical simulation and exergy analysis of a single-stage GM cryocooler

Towards the Isothermal Gas Compression—A Novel Finned Piston-Cylinder with Increased Efficiency

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