scholarly journals Analysis of nodalization effects on the prediction error of generalized finite element method used for dynamic modeling of hot water storage tank

2015 ◽  
Vol 36 (3) ◽  
pp. 123-138 ◽  
Author(s):  
Marcin Wołowicz ◽  
Jakub Kupecki ◽  
Katarzyna Wawryniuk ◽  
Jarosław Milewski ◽  
Konrad Motyliński
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Flow Rate ◽  
Prediction Error ◽  
Storage Tank ◽  
Water Storage ◽  
Hot Water ◽  
Generalized Finite Element Method ◽  
Water Storage Tank ◽  
Generalized Finite Element

Abstract The paper presents dynamic model of hot water storage tank. The literature review has been made. Analysis of effects of nodalization on the prediction error of generalized finite element method (GFEM) is provided. The model takes into account eleven various parameters, such as: flue gases volumetric flow rate to the spiral, inlet water temperature, outlet water flow rate, etc. Boiler is also described by sizing parameters, nozzle parameters and heat loss including ambient temperature. The model has been validated on existing data. Adequate laboratory experiments were provided. The comparison between 1-, 5-, 10- and 50-zone boiler is presented. Comparison between experiment and simulations for different zone numbers of the boiler model is presented on the plots. The reason of differences between experiment and simulation is explained.

Evaluation of Thermal Stratification Inside a New Model of Spherical Water Storage Tank Using a Computational Fluid Dynamics 6 Degrees of Freedom Solver

2019 ◽  
Vol 12 (3) ◽  
Author(s):  
Mohamed Taher Bouzaher ◽  
Belghar Noureddine ◽  
Charaf-Eddine Bensaci ◽  
Nora Bouchahm ◽  
Belhi Guerira
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Flow Rate ◽  
Storage Tank ◽  
Cold Water ◽  
Fluid Dynamic ◽  
Water Storage ◽  
Hot Water ◽  
Computational Domain ◽  
Water Storage Tank

Abstract In this work, a computational analysis of a spherical solar hot water storage tank during the discharging process is carried out by using the commercial code ansys-fluent.15. The study investigates a new type of spherical heat storage tank. A hinged baffle is fixed at the tank vertical axis to increase the discharge flow rate without a thermocline layer. The dynamic mesh LAYERING technique is used to update the computational domain during the movement of the hinged baffle. The passive pitching of the submerged baffle is due to the fluid-dynamic loads. This model limits the mixture between hot and cold water regardless of the inlet flow rate. A comparative study between tanks with typical diffusers and the hinged baffle model is considered. The comparison of the computational fluid dynamics results with available experimental data showed a good agreement. Examinations of the temperature contours indicate that for the typical models, the interaction between the incoming cold water and the stored hot water gives rise to a thick thermocline layer where its temperature and thickness are related to the intensity of the mixing process. The suggested model shows high stratification efficiency along the discharging process.

Steady State Heat Conduction Modeling by the Generalized Finite Element Method

2018 ◽  
Author(s):  
Humberto Alves da Silveira Monteiro ◽  
Guilherme Garcia Botelho ◽  
Roque Luiz da Silva Pitangueira ◽  
Rodrigo Peixoto ◽  
FELICIO BARROS
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Heat Conduction ◽  
Steady State ◽  
Generalized Finite Element Method ◽  
State Heat ◽  
Steady State Heat ◽  
Generalized Finite Element ◽  
Element Method
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