A fast running numerical model based on the implementation of volume forces for prediction of pressure drop in a fin tube heat exchanger

Rezk, Kamal; Forsberg, Jan

doi:10.1016/j.apm.2014.04.051

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…Due to the limitations of FEM-based methods (geometry preparation, meshing, computational burden or software licenses among others) or the limitations of lumped parameter methods (poor discretization or not considering the temperature dependency of the cable parameters), to overcome these drawbacks, it is highly appealing to develop fast and accurate transient models [ 23 ], if possible based on model reduction methods [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

A Model to Calculate the Current–Temperature Relationship of Insulated and Jacketed Cables

Ruiz

Llauradó

2022

Materials

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This paper proposes and validates using experimental data a dynamic model to determine the current–temperature relationship of insulated and jacketed cables in air. The model includes the conductor core, the inner insulation layer, the outer insulating and protective jacket and the air surrounding the cable. To increase its accuracy, the model takes into account the different materials of the cable (conductor, polymeric insulation and jacket) and also considers the temperature dependence of the physical properties, such as electrical resistivity, heat capacity and thermal conductivity. The model discretizes the cable in the radial direction and applies the finite difference method (FDM) to determine the evolution over time of the temperatures of all nodal elements from the temperatures of the two contiguous nodes on the left and right sides. This formulation results in a tri-diagonal matrix, which is solved using the tri-diagonal matrix algorithm (TDMA). Experimental temperature rise tests at different current levels are carried out to validate the proposed model. This model can be used to simulate the temperature rise of the cable when the applied current and ambient temperature are known, even under short-circuit conditions or under changing applied currents or ambient temperatures.

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Section: Introductionmentioning

confidence: 99%

A Model to Calculate the Current–Temperature Relationship of Insulated and Jacketed Cables

Ruiz

Llauradó

2022

Materials

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“…Geometrical structure of a heat exchanger is mostly compact and complex, which makes discretization of such domain and further computations problematic. This applies in particular to small but important elements, like finned pipes, in terms of heat transfer and pressure drop [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and development of an in-house CFD condensation hood model

et al. 2021

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An existing condensation hood has been numerically investigated using k-ε turbulence and species transport models. Due to the geometrical complexity of the appliance, two additional mathematical models were introduced with the use of User Defined Functions (UDFs). They were a model of a fan and a model of the internally finned pipes of a heat exchanger. The latter also involved a condensation model of steam implemented by mass and energy source terms. Such an approach allowed us to avoid troublesome two-phase flow simulation and thus significantly reduced the computational effort. Based on the results provided by the numerical model, potential improvements of the heat exchanger were proposed and implemented into a second, modified numerical model. Reduction of the number of the pipes by 25% is the most important change of the developed device. Its negative effect on condensation efficiency was to be compensated by improvements of steam flow in the device. Once the modifications had been evaluated, the prototype of the device was built and tested experimentally. Both the numerical and experimental results agree and show that, the modified condensation hood is comparable to the original construction in terms of condensation efficiency, despite the significant heat transfer surface area reduction.

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“…A commercial finite volume methodbased code, CFX, was used to model the convective heat transfer in a representative elementary volume for fin and tube heat exchanger. Applying a finite element simulation in COMSOL, a fast running numerical model for prediction of pressure drop in a fin tube heat exchanger was developed by Rezk and Forsberg [13]. Taler and Ocłoń [14] correlated air-side heat transfer results based on the CFD modeling for plate fin and oval tube heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling and control of plate fin and tube heat exchangers

Taler

2015

Energy Conversion and Management

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A fast running numerical model based on the implementation of volume forces for prediction of pressure drop in a fin tube heat exchanger

Cited by 10 publications

References 10 publications

A Model to Calculate the Current–Temperature Relationship of Insulated and Jacketed Cables

A Model to Calculate the Current–Temperature Relationship of Insulated and Jacketed Cables

Experimental analysis and development of an in-house CFD condensation hood model

Mathematical modeling and control of plate fin and tube heat exchangers

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