Numerical investigation of cryogen re-gasification in a plate heat exchanger

Malecha, Ziemowit; Płuszka, Paweł; Brenk, Arkadiusz

doi:10.1088/1757-899x/278/1/012063

Cited by 4 publications

(13 citation statements)

References 5 publications

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“…In the currently developed numerical model the computational domain was divided into five separated regions as shown in Figure 5. This can be perceived as a simplified geometrical feature of a plate heat exchanger (PHE) [40,41], which usually consists of a large number of thin plates separated by a small gap. Consequently, the PHE channels contain alternately hot and cold fluid.…”

Section: Numerical Modelmentioning

confidence: 99%

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

2019

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The liquid natural gas (LNG) boiling process concerns most LNG applications due to a need for regasification. Depending on the pressure, the equilibrium temperature of LNG is 112–160 K. The low boiling temperature of LNG makes the vaporization process challenging because of a large temperature difference between the heating medium and LNG. A significant risk included in the regasification process is related to the possibility of solid phase formation (freezing of the heating fluid). A solid phase formation can lead to an increase in pressure loss, deterioration in heat transfer, or even to the destruction of the heat exchanger. This prompts the need for a better understanding of the heat transfer during the regasification process to help avoid a solid phase formation. The present research is focused on the investigation of the mutual interactions between several parameters, which play a significant role in the regasification process. The research is based on a zero-dimensional (0D) model, which was validated through the comparison with a state-of-the-art Computational Fluid Dynamics (CFD) model. This made fast calculations and the study of the risk of freezing for a wide range of parameter space possible, including the LNG boiling regime. The boiling regime of LNG was shown to be a key factor in determining the risk of freezing.

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Section: Numerical Modelmentioning

confidence: 99%

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

2019

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“…Consequently, fast and physically consistent calculations of a flow in the PHE are also made possible. In the above-mentioned author's work [19], a reduction of the 3D geometry to its 2D representation has been successfully carried out and confirmed through comparison with experimental results. Nevertheless, the work only considered a single pair of plates (one flow channel).…”

Section: Introductionmentioning

confidence: 70%

“…The main challenge in the numerical modeling of a real PHE is related to its very complicated geometry and the requirement of a high-resolution mesh to properly capture the flow as it relates to physics and heat transfer. Consequently, exploring a wide range of flow parameters and geometrical variations can be even more time consuming, or even impossible, for averaged-sized supercomputers [19]. This problem can be solved by an appropriately designed calculation methodology based on physically consistent simplifications that lead to a fast and reliable numerical model.…”

Section: Introductionmentioning

confidence: 99%

“…In our previous work [19], the properly designed 3D numerical mesh of a typical PHE was shown to consist of hundreds of millions of computational nodes. This is prohibitively too much for engineering applications, especially for flows with a phase change.…”

Section: Introductionmentioning

confidence: 99%

“…It is important to note that in the previously motioned work [19], a two-phase flow with evaporation was modeled. A satisfactory comparison with an experiment confirmed that consistent geometrical reductions can be applied in the case of more complex flows.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Study of Flow Maldistribution in Multi-Plate Heat Exchangers Based on Robust 2D Model

2018

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Plate heat exchangers (PHE) are characterized by high heat transfer efficiency and compactness. An exploitation problem of the PHE is related to flow maldistribution, which can make part of the PHE idle, resulting in overheating and damage. Making geometrical modifications to the PHE can help reduce flow maldistribution. Modifications should be kept to a minimum, so as not to complicate the production process. There is a large number of possible geometrical modifications, which simply considers additional obstacles or stream dividers. To test all of them would be impractical and would also take a prohibitively long amount of time to obtain experimental measurements. A typical PHE is characterized by a complex system of channels. Making numerical calculations of its 3D model can be prohibitively time and resource-consuming. The present work introduces a physically consistent methodology of the transformation of a real 3D geometry to its 2D representation. Its main novelty is to assure the same pressure drop balance remains between the 3D and 2D geometries. This is achieved by a preservation of the same cumulative pressure losses in both geometries. The proposed innovative approach levels the pressure balance difference by adding properly designed local geometrical modifications. The developed methodology allowed a wide range of parameter space and various geometrical modifications to be investigated, and revealed geometrical optimizations leading to the improved performance of the PHE. To minimize the influence of other factors, an incompressible and single-phase flow was studied.

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Numerical simulation of the nitrogen boil-off recondensation in hybrid cooling devices for HPGe detectors

Malgin

Venčels²

2023

J. Inst.

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This paper describes the results of a complex simulation of nitrogen boil-off recondensation in a hybrid cooling device for High Purity Germanium (HPGe) detectors. The OpenFOAM platform-based software was used. The proposed finite-volume axisymmetric 2D model combines cooling processes occurring in the considered three-phase medium, including a liquefier condenser (solid), nitrogen boil-off (gas) and the resulting condensate (liquid). At the beginning of the simulation condenser and gas temperatures are set above the condensation point while the end time is set such that the system reaches a quasi-steady state. For conical and hemispherical condensers, the energy consumption for the following processes occurring in the operating mode such as: condenser cooling; cooling of adjacent boil-off nitrogen vapors; their condensation; the gravity-driven flowing; condensate film subcooling and subsequent partial re-evaporation from its surface are compared. The visualizations of the temperature field of the finite-volume model and the velocity vectors of nitrogen vapors adjacent to the condenser are presented. The calculated integral mass recondensation rates were confirmed experimentally on a commercial hybrid cooling device, taking into account the actual equivalent characteristics of the liquefier on the Stirling cryocooler used.

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Numerical investigation of cryogen re-gasification in a plate heat exchanger

Cited by 4 publications

References 5 publications

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

Theoretical and Numerical Analysis of Freezing Risk During LNG Evaporation Process

Numerical Study of Flow Maldistribution in Multi-Plate Heat Exchangers Based on Robust 2D Model

Numerical simulation of the nitrogen boil-off recondensation in hybrid cooling devices for HPGe detectors

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