Energy thermal management in commercial bread-baking using a multi-objective optimisation framework

Khatir, Zinedine; Taherkhani, Ali Reza; Paton, Joe; Thompson, H. M.; Kapur, Nikil; Торопов, В. В.

doi:10.1016/j.applthermaleng.2015.01.042

Cited by 25 publications

(17 citation statements)

References 24 publications

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“…Due to the computational requirements of the 3D VOF CFD and the experimental analyses, a surrogate modelling approach is adopted for the optimisation study, a methodology that has been successfully applied by the authors for a range of engineering applications, e.g. the design optimisation of commercial ovens [26][27][28]. A Design of experiments (DOE) approach based on 2D LBM is used to generate 67 points uniformly spread within the design space (r, ) .…”

Section: Optimisation Strategymentioning

confidence: 99%

Dropwise condensation heat transfer process optimisation on superhydrophobic surfaces using a multi-disciplinary approach

Khatir

Kubiak

Jimack

et al. 2016

Applied Thermal Engineering

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Dropwise condensation has superior heat transfer efficiency than filmwise condensation; however condensate evacuation from the surface still remains a significant technological challenge. The process of droplets jumping, against adhesive forces, from a solid surface upon coalescence has been studied using both experimental and Computational Fluid Dynamics (CFD) analysis. Both Lattice Boltzmann (LBM) and Volume of Fluid (VOF) methods have been used to evaluate different kinematic conditions of coalescence inducing a jump velocity. In this paper, an optimisation framework for superhydrophobic surface designs is presented which uses experimentally verified high fidelity CFD analyses to identify optimal combinations of design features which maximise desirable characteristics such as the vertical velocity of the merged jumping droplet from the surface and energy efficiency. A Radial Basis Function (RBF)-based surrogate modelling approach using design of experiment (DOE) technique was used to establish near-optimal initial process parameters around which to focus the study. This multidisciplinary approach allows us to evaluate the jumping phenomenon for superhydrophobic surfaces for which several input parameters may be varied, so as to improve the heat transfer exchange rate on the surface during condensation. Reliable conditions were found to occur for droplets within initial radius range of r=20-40 m and static contact angle s~160º. Moreover, the jumping phenomenon was observed for droplets with initial radius of up to 500 m. Lastly, our study also reveals that a critical contact angle for droplets to jump upon coalescence is c~1 40º. KeywordsCondensation heat transfer, Super-hydrophobic surface, Jumping droplets velocity, Multi-disciplinary optimisation. IntroductionDrop-wise condensation processes, where condensation occurs through small droplets on a solid surface, has been demonstrated to significantly improve heat transfer rates in comparison to filmwise condensation (where a whole surface is covered by a thin film of liquid) [1,2]. Drop-wise condensation usually takes place on hydrophobic or super-hydrophobic surfaces as demonstrated by Boreyko and Chen [3]. One of the main technological challenges is to create such a surface, so as to allow condensation and evacuation of the droplets to take place in a continuous manner. Droplet coalescence is a complex physical phenomenon and optimisation of kinematic conditions leading to surface dewetting and jumping of droplets is of paramount importance for processes like heat transfer, de-icing, atmospheric water harvesting or dehumidification [4][5][6]. Dropwise condensation heat transfer performance can be enhanced by allowing condensed droplets to be removed rapidly from the surface to minimize the thermal barrier [7]. Recently, researchers showed that superhydrophobic surfaces provide a higher mobility of condensates, which may enhance the heat transfer performance [1][2][3][4][5][6][7]. Coalescence-induced jumping phenomena occur on superhydrophobic surfa...

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Section: Optimisation Strategymentioning

confidence: 99%

Dropwise condensation heat transfer process optimisation on superhydrophobic surfaces using a multi-disciplinary approach

Khatir

Kubiak

Jimack

et al. 2016

Applied Thermal Engineering

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“…In particular, wood and charcoal obtained from natural forest resources are the main energy sources in several developing countries ( Sagouong and Tchuen, 2018a , Sagouong and Tchuen, 2018b ). Because the bread baking sector is an important industrial activity, the question of optimizing the existing oven configurations is of special importance since it can lead to new designs ( Kokolj et al., 2017 ; Khatir et al., 2015 ). Ovens heat bread by conduction, convection, and radiation.…”

Section: Introductionmentioning

confidence: 99%

Modeling, simulation and optimization of solid fuel bread ovens commonly used in developing countries

Hatou

Tchuen

Woafo

2021

Heliyon

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In this work, we propose a mathematical model describing thermal behavior and heating process optimization of solid fuel bread ovens. Numerical simulation leads to temperature profiles of the oven. The design and implementation of an operating prototype permits us to obtain, with type K thermocouples, experimental temperature profiles in some points of the oven. There is a good agreement between the experimental results and those obtained from the numerical simulation of the proposed model. A permanent temperature value of 220 °C is reached in the baking chamber. It is obtained that the energy efficiency of the oven is 49%. Making use of the objective gain function, it is found that the optimal parameters of the oven are the following: 50 W as optimum operating value of the electric power of the blower, 3 m 2 as the optimum operating value of the total surface of the baking chamber; and 0.67 as the optimum operating value of the filling factor between the heating chamber and the baking chamber. The developed model serves to better understand the operation, the optimization and to rationally manage energy expenditure related to solid fuel bread ovens in developing countries.

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“…The CFD model has been used to simulate the absorbed heat flux for developing the new design of gas-fired burner incorporated into the industrial tunnel baking oven [15]. Khatir et al [16,17] the CFD model coupled with a multi-objective optimization framework to find out the optimal design features of the bread-baking oven (oven nozzle size, oven depth) which performed the well thermal distribution throughout the oven. However, academic studies on CFD modeling for curing ovens carried out at a paint curing process in an automotive industry have rarely found.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of energy efficiency in a paint curing oven via CFD approach: Case study in an air-conditioning plant

2015

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Energy thermal management in commercial bread-baking using a multi-objective optimisation framework

Cited by 25 publications

References 24 publications

Dropwise condensation heat transfer process optimisation on superhydrophobic surfaces using a multi-disciplinary approach

Dropwise condensation heat transfer process optimisation on superhydrophobic surfaces using a multi-disciplinary approach

Modeling, simulation and optimization of solid fuel bread ovens commonly used in developing countries

Enhancement of energy efficiency in a paint curing oven via CFD approach: Case study in an air-conditioning plant

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