Numerical study of the influence of boundary conditions on the computational modeling of earth-air heat exchanger

Authors

  • Michel Kepes Rodrigues Universidade Federal do Rio Grande Programa de Pós-Graduação em Modelagem Computacional
  • Jeferson Avila Souza Universidade Federal do Rio Grande Programa de Pós-Graduação em Modelagem Computacional
  • Joaquim Vaz Universidade Federal do Rio Grande Escola de Engenharia
  • Ivoni Carlos Acunha Junior Instituto Federal de Educação, Ciência e Tecnologia (IFRS), Campus Rio Grande
  • Luiz Alberto Oliveira Rocha Universidade Federal do Rio Grande do Sul Programa de Pós-Graduação em Modelagem Computacional
  • Ruth da Silva Brum Universidade Federal de Pelotas Departamento de Matemática e Estatística
  • Elizaldo Domingues dos Santos Universidade Federal do Rio Grande do Sul Programa de Pós-Graduação em Modelagem Computacional
  • Liércio André Isoldi Universidade Federal do Rio Grande do Sul Programa de Pós-Graduação em Modelagem Computacional

DOI:

https://doi.org/10.14808/sci.plena.2015.081334

Keywords:

earth-air heat exchanger, numerical simulation, boundary conditions.

Abstract

The earth-air heat exchanger (EAHE) is a device used to improve the thermal condition of built environments, contributing to the reduction in electrical energy consumption of traditional air conditioning equipments. So the objectives of this study are to evaluate the influence of the thermal boundary condition of null flux prescribed in the thermal potential (TP) of the TCSA, which is imposed on the sides of the computational domain, and to study the effect of the type of thermal boundary condition imposed on the lower surface of the computational domain in the processing time of an EAHE numerical simulation. To do so, a validated and verified computational model, developed in FLUENT software, which is based on the Finite Volume Method (FVM), was employed. The results showed that the PT of the EAHE installations analyzed is affected for a horizontal spacing between the duct and the computational domain wall, less than 2.00 m. Furthermore, it was found that the use of the boundary condition of prescribed temperature imposed to the lower surface at the computational domain contributed to the reduction of the numerical simulation processing time in 18%, if compared with the use of the boundary condition of prescribed null thermal flux.

Author Biography

Michel Kepes Rodrigues, Universidade Federal do Rio Grande Programa de Pós-Graduação em Modelagem Computacional

http://lattes.cnpq.br/0379919270609981

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Published

2015-08-31

How to Cite

Rodrigues, M. K., Souza, J. A., Vaz, J., Junior, I. C. A., Rocha, L. A. O., Brum, R. da S., … Isoldi, L. A. (2015). Numerical study of the influence of boundary conditions on the computational modeling of earth-air heat exchanger. Scientia Plena, 11(8). https://doi.org/10.14808/sci.plena.2015.081334

Issue

Vol. 11 No. 8 (2015): August/Agosto 2015

Section

VI Conferência Sul em Modelagem Computacional

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