CFD modeling of a radiant tube heater

Ahanj, Mohammad Davood; Rahimi, Masoud; Alsairafi, Ammar Abdulaziz

doi:10.1016/j.icheatmasstransfer.2012.01.011

Cited by 28 publications

(8 citation statements)

References 17 publications

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“…These models were validated against the flue gas compositions and the corresponding temperature measurements on the tube. Ahanj et al [18] performed similar investigations and focussed on finding the optimum operating condition by determining the relationship between the burner air-ratio and the combustion efficiency of the radiant tube burner. Wang et al [19] carried out simulations in the same way to study the effects of air staging on thermal and prompt NO x formation using validated FVM models.…”

Section: Early Macroscopic Studiesmentioning

confidence: 99%

Influence of Surroundings on Radiant Tube Lifetime in Indirect-Fired Vertical Strip Annealing Furnaces

et al. 2020

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The effects of surrounding radiation—emanating from radiation exchange with neighboring partners in indirect-fired vertical strip annealing furnaces, such as the other radiant tubes, the passing strip, and the enclosing furnace chamber—on the radiant tube lifetime were studied. In-house developed and validated numerical models were used to calculate the thermomechanical behavior, especially creep deformations and the corresponding stresses as lifetime indicating parameters. Different setups of recirculating P-type radiant tubes were investigated, including a reference case of an isolated tube. The investigations could be broadly classified into the study of the effects of different tube arrangements, burner operations (synchronous/asynchronous on/off firing), and changes of strip parameters (width/temperature). Results showed higher creep deformation of the central radiant tube in the setup with three tubes arranged horizontally in a row compared to three tubes stacked in a vertical column, even though the respective characteristic temperature values in a firing cycle were similar. Furthermore, the cases with asynchronous burner firing resulted in lower creep rates than other cases, where the burners were operating in synchronous on/off firing modes. In addition, the change of strip width had a higher impact on radiant tube lifetime compared to locally changing strip temperatures across the furnace. Alternating temperatures, caused by burner operation or process changes, such as change of strip’s speed or cross-section, and local temperature gradients were observed to be the main factors influencing the tube’s service life.

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Section: Early Macroscopic Studiesmentioning

confidence: 99%

Influence of Surroundings on Radiant Tube Lifetime in Indirect-Fired Vertical Strip Annealing Furnaces

et al. 2020

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“…They progressively refined the mesh to reduce the numerical diffusion. In addition, the same approach has been employed in recent studies on related topics [9,19].…”

Section: Computational Domain Geometry and Discretizationmentioning

confidence: 99%

“…14 Finally, there were another alternatives to compute the radiation heat transfer between the surfaces of the computational domain (enclosure walls and heat source faces): the Discrete Transfer Radiation Model (DTRM)employed in several similar researches [9,19,23,35] or P-1 radiation model (the simplest case of the more general P-N radiation model). However, the DTRM successful application demands a large number of rays and this implies more intensive central processing unit (CPU) computations.…”

Section: Radiation Modelingmentioning

confidence: 99%

“…Instead, the CFD technique has been successfully employed in various fields. We cite here only several recent applications related to modeling of technical systems in the field of building equipment (the topic of our study): ventilation system for hospital operating room [4], effect of l p ("u -fl " bu u " -h " bu on) for an air conditioned office room [5], natural ventilation of buildings [6], radiation panel cooling system installed in walls [7], radiant cooling ceiling [8], radiant tube heater [9], evaporator and condenser of a rooftop air-conditioning unit [10], under-floor heating system [11], skirting boards heating system [12]. It is interesting to note that the CFD approach has been also used for peculiar studies, e.g.…”

Section: Introductionmentioning

confidence: 99%

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CFD modeling of buoyancy driven cavities with internal heat source—Application to heated rooms

Teodosiu

Kuznik

Teodosiu

2014

Energy and Buildings

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The aim of this work is to examine the capacity and the accuracy of a CFD (Computational Fluid Dynamics) model to characterize the thermo-aeraulic behavior of a heated room. Firstly, we present a brief description of the experimental setup taken into account. Afterwards, we focus on the main features of our numerical model (that strongly influence the accuracy of results): computational domain geometry and discretization, turbulence model, near wall treatment, radiation model and thermal boundary conditions. In addition, we present here a simplified approach in order to integrate a pure buoyancy source within our model, based on a volumetric heat generation rate (taking into account only the source power and its dimensions) which is uniformly distributed within the heater. Furthermore, detailed experimentalnumerical comparisons are given with regard to heat transfer to the walls as well as to heat source behavior and plume characteristics. The results obtained demonstrate that the CFD method employed in this work leads to reliable results. Consequently, this approach can be useful in detailed studies dealing with thermal comfort, indoor air quality and energy consumption for heated rooms. Finally, the simplified method presented here, concerning the integration of the heat source in the CFD model, can be effortlessly extended for other localized heat sources that differ in power, heat emission mode (convection or radiation), shape or size.

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“…On the other hand, it is obvious nowadays that these criteria cannot be met without investigations using modern computational techniques. In line with this, the CFD (Computational Fluid Dynamics) approach has been successfully employed for applications dealing with the modeling of different technical systems in the field of building equipment: ventilation systems [1], air conditioned systems [2], radiation panel cooling systems installed in walls [3], radiant cooling ceiling [4], radiant tube heater [5], underfloor heating systems [6], skirting boards heating systems [7], and evaporator and condenser of a rooftop air-conditioning unit [8].…”

Section: Introductionmentioning

confidence: 99%

The angular discretization impact of thermal radiation computations on heat transfer in rooms

Teodosiu¹,

Teodosiu²,

Ilie³

2016

Fourth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2016

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The objective of this study is to evaluate the accuracy of CFD (Computational Fluid Dynamics) simulations for airflows driven by buoyancy in heated real scale rooms. In addition, this study is focusing on the influence of angular discretization used for thermal radiation computations in CFD modeling. The numerical results are compared with experimental data from the literature, based on investigations dealing with thermal coupling-room-electric heat sources‖, using full scale test cells. The results show that there is no sensitivity of radiative heat flux to the walls of the room to angular discretization used in the radiation model. This means that for simple geometries, minimum angular discretization can be used for the radiation model in CFD simulations, leading to important savings in CPU (Central Processing Unit) time. Nevertheless, this deduction must be checked by further work for other configurations.

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CFD modeling of a radiant tube heater

Cited by 28 publications

References 17 publications

Influence of Surroundings on Radiant Tube Lifetime in Indirect-Fired Vertical Strip Annealing Furnaces

Influence of Surroundings on Radiant Tube Lifetime in Indirect-Fired Vertical Strip Annealing Furnaces

CFD modeling of buoyancy driven cavities with internal heat source—Application to heated rooms

The angular discretization impact of thermal radiation computations on heat transfer in rooms

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