Effective cooling of stacked heat-generating bodies in a large room: Comparison between floor and side-wall air injection

Berg, Jacob; Soliman, H.M.; Ormiston, S.J.

doi:10.1016/j.ijthermalsci.2007.06.007

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…To the authors' best knowledge, there has been no research conducted that would be comparable to this, aside from previous work that has been done earlier at the University of Manitoba (Berg et al 2008a(Berg et al , 2008b). …”

Section: List Of Symbolsmentioning

confidence: 88%

“…Later, Berg et al (2008a) measured the temperature in certain locations inside an actual valve hall during operation. Safety restrictions, due to the very high voltage in the towers, prevented the installation of any measuring devices unless they were at least a distance of 2.5 m away from the towers and a height of at least 12.3 m above the floor.…”

Section: Numerical Solution and Validationsmentioning

confidence: 99%

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Simulation and performance enhancement of the air cooling system in the valve halls of a DC/AC power converter station

et al. 2010

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The present article reports on a ventilation system that uses impinging air jets to remove a portion of the heat generated in DC/AC converter towers. Each tower is a vertical stack of electronic components used in the power conversion. Airflow from the ventilation system enters the room through inlet ports located on the ground at two opposite sides of the DC/AC converter towers. The existing ventilation system circulates sufficient airflow in terms of the total heating load; however, elevated temperatures were reported within the towers due to poor air circulation. A numerical study has been conducted to investigate steady three-dimensional (3-D) turbulent mixed (combined free and forced) convection air cooling of vertical stacks of heat-generating blocks simulating typical towers in two valve halls of a DC/AC power converter station. The simulation results include the magnitudes of the net airflows for all the inter-block gaps, the maximum temperature in each gap, and the flow structure represented by streamlines at various locations of the 3-D domain. The location of the inlet, the inlet size and aspect ratio, and the location on the tower at which the airflow was aimed were varied parametrically to improve the ventilation relative to the existing design. These results demonstrate that, for fixed inlet mass flow rate, all the towers' heat generating surfaces can be kept under 60°C via simple modifications of the variables used in the parametric study.

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Section: List Of Symbolsmentioning

confidence: 88%

Section: Numerical Solution and Validationsmentioning

confidence: 99%

Simulation and performance enhancement of the air cooling system in the valve halls of a DC/AC power converter station

et al. 2010

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“…For particle treatment, the particles in this study were treated as spherical. The simulation calculation of the dust collection efficiency under actual working conditions, such as the diameter, density, etc., was performed in combination with the particle properties test results [30]. The particles were static and uniform spatial distribution on the floor [22,26,29].…”

Section: Algorithm Selection and Model Parameter Settingmentioning

confidence: 99%

Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

Yuan

Zhang

et al. 2020

Mechanics & Industry

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The vacuum-blowing cleaning system, utilizing positive and negative pressure mixed-delivery theory, has been adopted for the road sweeper vehicle. To enhance the solid particle separation performance and to evaluate the motion characteristics of inhaled particles under different structural parameters, the gas-solid flow in the vacuum-blowing cleaning system was investigated by using computational fluid dynamics (CFD) technology. The influence of the main structural parameters on the grade dust collection efficiency and average detention time of the inhaled particles was determined, such as suction-inlet diameter, suction-inlet inclination angle, and front baffle inclination angle. And the interplay between them was also investigated. In addition, a dust collection efficiency model was built, based on uniform design (UD) and multiple regression analysis (MRA), and subsequently verified via experiments. The results revealed that the structural parameters have significant influence on the dust collection performance. The suction-inlet diameter, front baffle inclination angle, and suction-inlet inclination angle exerted the highest, second-highest, and lowest influence, respectively. Furthermore, the interaction among structural parameters also influenced the collection performance. The highest, second-highest, and lowest levels of influence were determined for the inlet diameter/baffle inclination angle, inlet inclination angle/baffle inclination angle, and inlet diameter/inlet inclination interactions, respectively. The highest dust collection efficiency (i.e., 96.10%) and a short average detention time of particles in the chamber were realized under the following conditions: suction-inlet diameter and inclination angle: 200 mm and 110°, respectively, and front baffle inclination angle: 105°.

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“…Currently, the research on the overtemperature state of HVDC converter valves is insufficient. Berg et al [8] and Zhou et al [9] simulated thermodynamic models of two specific types of converter valves by using 3D simulation and numerical calculation methods so as to obtain a novel valve layout for better heat dissipation efficiency, but converter valves of other types need to be re-simulated before analysis, which is not universally applicable. Liu et al [10] studied the structure of an internal reactor and other components of a converter valve and proposed a method for reducing the heat generated during the operation of a converter valve by reducing the valve's power loss, but this method is still incapable of improving the perception of operation and maintenance personnel of the overtemperature of converter valves.…”

Section: Introductionmentioning

confidence: 99%

TransFNN: A Novel Overtemperature Prediction Method for HVDC Converter Valves Based on an Improved Transformer and the F-NN Algorithm

Zhou

Qin

Sun

et al. 2023

Sensors

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Appropriate cooling of the converter valve in a high-voltage direct current (HVDC) transmission system is highly significant for the safety, stability, and economical operation of a power grid. The proper adjustment of cooling measures is based on the accurate perception of the valve’s future overtemperature state, which is characterized by the valve’s cooling water temperature. However, very few previous studies have focused on this need, and the existing Transformer model, which excels in time-series predictions, cannot be directly applied to forecast the valve overtemperature state. In this study, we modified the Transformer and present a hybrid Transformer–FCM–NN (TransFNN) model to predict the future overtemperature state of the converter valve. The TransFNN model decouples the forecast process into two stages: (i) The modified Transformer is used to obtain the future values of the independent parameters; (ii) the relation between the valve cooling water temperature and the six independent operating parameters is fit, and the output of the Transformer is used to calculate the future values of the cooling water temperature. The results of the quantitative experiments showed that the proposed TransFNN model outperformed other models with which it was compared; with TransFNN being applied to predict the overtemperature state of the converter valves, the forecast accuracy was 91.81%, which was improved by 6.85% compared with that of the original Transformer model. Our work provides a novel approach to predicting the valve overtemperature state and acts as a data-driven tool for operation and maintenance personnel to use to adjust valve cooling measures punctually, effectively, and economically.

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Effective cooling of stacked heat-generating bodies in a large room: Comparison between floor and side-wall air injection

Cited by 5 publications

References 16 publications

Simulation and performance enhancement of the air cooling system in the valve halls of a DC/AC power converter station

Simulation and performance enhancement of the air cooling system in the valve halls of a DC/AC power converter station

Enhancement of particle collection efficiency considering the structural interplay: particle motion characteristics analysis

TransFNN: A Novel Overtemperature Prediction Method for HVDC Converter Valves Based on an Improved Transformer and the F-NN Algorithm

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