Air curtains for reduction of natural convection heat loss from a heated plate: A numerical investigation

Mondal, Razon; Torres, Juan F.; Hughes, Graham; Pye, John

doi:10.1016/j.ijheatmasstransfer.2022.122709

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…The observed experimental reduction of the convective losses of around 30% due to airwall operation is in line with the values based on numerical simulations [3,4]. Since for the conducted experiments the setup was not yet fully optimized, there is reasonable expectation that slightly higher values will be achieved experimentally in the future.…”

Section: Discussionsupporting

confidence: 85%

“…In this concept, the inside of the cavity is separated from the colder environment by a slim but powerful air jet. The airwall concept has been simulated numerically [3,4,5] and it was also tested experimentally [6,7], but to our knowledge no industrial-scale tests have been carried out yet. To be able to draw reliable conclusions from an experiment, the relevant characteristic numbers (Grashof, Reynolds, Richardson) of the test setup need to be similar to those of the real scale system.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Test Setup of an Airwall to Reduce the Convective Heat Loss in Solar Thermal Cavity Receivers

Bitterling,

Bern,

Fugmann

et al. 2023

SolarPACES Conf Proc

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An experimental setup is presented which allows to experimentally determine the thermal heat losses from a heated solar cavity receiver with an airwall. The setup is a ‘near-full-scale’ replica of a receiver, which ensures that the characteristic fluid dynamic numbers are in a range relevant for practical industrial applications. The executed tests show that – at ideal configuration – the airwall can reduce the overall thermal losses by 7±2%. The reduction of the convective losses amounts to 32±11%, which is in line with the known predictions from CFD simulations.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Experimental Test Setup of an Airwall to Reduce the Convective Heat Loss in Solar Thermal Cavity Receivers

Bitterling,

Bern,

Fugmann

et al. 2023

SolarPACES Conf Proc

View full text Add to dashboard Cite

show abstract

“…The size of the mesh is one of the most important factors affecting the accuracy of the operation, and the model is meshed using ANSYS [20]. Comprehensively considering the computer computing power and simulation effect, a tetrahedral grid is used for nonstructural division, and the air curtain and the smaller parts of the surrounding area are partially meshed [21,22].…”

Section: Meshingmentioning

confidence: 99%

Effect of a Double-Machine Parallel Air Curtain on Wind Flow in an Underground Roadway of a Coal Mine

Huang,

Wang,

Zhang

et al. 2023

Processes

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In order to study the effect of a double-machine parallel circulation air curtain in intercepting wind flow in a mine roadway, the air curtain jet angle and full fan pressure were analyzed. Taking a metal mine roadway as the engineering background, Fluent numerical simulation technology was used to establish an equi-proportional physical model of the original roadway, and a K45-6 axial flow fan was selected to numerically simulate the flow field inside the original roadway, which was analyzed from three aspects: isolation pressure difference, air leakage volume and wind choke rate. The results show that when the full pressure of the fan is fixed, with an increase in the jet angle of the air curtain, the separation pressure difference and the wind choke rate show a trend of first increasing and then decreasing, and the air leakage volume shows a trend of first decreasing and then increasing. With an increase in the air curtain jet angle, the air curtain convergence gradually forms a complete air curtain, but when the air curtain jet angle continues to increase, the air curtain cannot effectively block the wind flow due to the transverse pressure from the roadway. When the jet angle is too small or the full pressure of the fan is too large, the phenomenon of induced air flow will occur, and the two-machine parallel air curtain will direct the air downstream of the roadway to upstream and no longer intercept the roadway air flow. After comprehensive analysis, the effect of wind control is obvious to set up a double-parallel air curtain in the roadway, and the optimal combination of the roadway air curtain is 30° for the full pressure blade of the fan and 30° for the jet angle.

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Progress in Concentrated Solar Power, Photovoltaics, and Integrated Power Plants Towards Expanding the Introduction of Renewable Energy in the Asia/Pacific Region

Gokon

2023

Curr Sustainable Renewable Energy Rep

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Air curtains for reduction of natural convection heat loss from a heated plate: A numerical investigation

Cited by 9 publications

References 31 publications

Experimental Test Setup of an Airwall to Reduce the Convective Heat Loss in Solar Thermal Cavity Receivers

Experimental Test Setup of an Airwall to Reduce the Convective Heat Loss in Solar Thermal Cavity Receivers

Effect of a Double-Machine Parallel Air Curtain on Wind Flow in an Underground Roadway of a Coal Mine

Progress in Concentrated Solar Power, Photovoltaics, and Integrated Power Plants Towards Expanding the Introduction of Renewable Energy in the Asia/Pacific Region

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