A Thermal Network Approach for a Quick and Accurate Study of Multiple Connected Switchgears

Nowak, Remigiusz; Duc, Janusz; Samul, Boguslaw; Manjunatha, A.

doi:10.1080/01457632.2021.1874175

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…Further, the solution of a system of equations for heat fluxes in the resulting scheme makes it possible to estimate their real values. This approach, based on the analogy of differential equations describing both electrical and thermal processes [25,26], is widely used in solving a wide range of engineering problems, for example, [27][28][29][30][31][32], including cryogenics [33,34].…”

Section: Assessment Of Heat Fluxes In the Liquefier Unitmentioning

confidence: 99%

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

Malgin

2024

J. Inst.

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The article discusses some practical aspects of engineering design associated with the use of Stirling cryocoolers in liquefiers of hybrid cooling devices for HPGe detectors. A feature of hybrid cooling devices is the presence of two modes: the recondensation mode when the cryocooler is operating, and the power interruption mode with a non-renewable LN 2 boil-off. Based on the Thermal Networks Method, models for each mode are proposed, for analyzing heat fluxes between standard components forming the liquefier unit. The proposed models were validated by comparing calculated parameters of the transition process between the two above-mentioned operating modes with those obtained experimentally. It is shown that the minimization of heat gain through the liquefier unit into Dewar for both operating modes of the hybrid cooling device leads to contradictory engineering design requirements. Preliminary conclusions based on the thermal network models are confirmed experimentally on a serial hybrid cooling device, produced by the Baltic Scientific Instruments Company. This resulted in practical recommendations on the choice of condenser position, which depended on operating conditions of hybrid cooling device, for example as a laboratory equipment or as a part of remote radiation monitoring stations.

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Section: Assessment Of Heat Fluxes In the Liquefier Unitmentioning

confidence: 99%

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

Malgin

2024

J. Inst.

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“…Most research in this area has focused on ohmic losses in switchgears (e.g. bus systems) and thermo-electric coupled simulations [1][2][3][4][5]. Industrial lowvoltage control cabinets differ in build and layout from switchgear and transformer cabinets and contain more temperature-sensitive electronics i.e.…”

Section: Introductionmentioning

confidence: 99%

Fast thermodynamic simulation of electrical control cabinets via thermal resistor networks

Haag,

Stergiaropoulos

2024

J. Phys.: Conf. Ser.

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A fine-grid Computational Fluid Dynamics (CFD) simulation without thermo-electric coupling provides an accurate prediction of temperatures inside low-voltage control cabinets. But due to its high computational demand and complexity, the approach is not eligible for a widespread use in pre-production design. This study presents a lightweight and robust model based on the thermal-electrical analogy and Kirchhoff’s current law. The thermal resistor network is created for each control cabinet individually. An isothermal coarse-grid CFD simulation is used to approximate flow resistances. Convective resistances are calculated with Nusselt number correlations. The approach was tested on 120 randomly generated 2D control cabinet configurations. Component temperature errors were evaluated based on a normal distribution approximation. For moderate temperature rises up to 20 K the model had a mean error of 0.38 K and a standard error of 1.51 K compared to the reference fine-grid CFD model and was up to 12.8 times faster.

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A novel matrix topology-based analysis method of thermal circuits for reliability optimization of HSER

LIANG,

LI,

YOU

et al. 2024

Chinese Journal of Aeronautics

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A Thermal Network Approach for a Quick and Accurate Study of Multiple Connected Switchgears

Cited by 6 publications

References 17 publications

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

Practical aspects of hybrid cooling devices engineering design for HPGe detectors

Fast thermodynamic simulation of electrical control cabinets via thermal resistor networks

A novel matrix topology-based analysis method of thermal circuits for reliability optimization of HSER

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