Numerical study of the effect of the turning angle on heat transfer in multilayered elements of external enclosure structures

About the authors:

Elena A. Ivanova, Senior Lecturer, Department of Heat and Gas Supply and Engineering Systems in Construction, Tomsk State University of Architecture and Building; energosber_e@mail.ru

Alexander N. Kozlobrodov, Dr. Sci. (Phys.-Math.), Professor, Department of Heat and Gas Supply and Engineering Systems in Construction, Tomsk State University of Architecture and Building;  akozlobrodov@mail.ru

Abstract:

When building low-rise buildings with a variety of structural elements, it is important to have an idea of their thermal state in extreme heat exchange conditions. Therefore, the study of heat transfer processes in heat-stressed elements of external fences is relevant and of considerable practical interest.

The purpose of this work is to conduct parametric studies in typical angular fragments of inhomogeneous enclosing structures with u-turn angles from 60 to 150°. At the same time, the analysis of the thermal state is carried out for both external and internal angles.

The mathematical modeling of spatial heat transfer in the fragments under consideration is based on the solution of a nonlinear system of differential equations of thermal conductivity with corresponding boundary conditions by the finite element method using the Thermal module included in the ANSYS software package.

The analysis of numerical results given for three types of enclosing structures made using various technologies allowed us to clarify the influence of their geometric and thermophysical characteristics on the distribution of temperature and heat flow over the thickness of the fragments under consideration, as well as to determine the change in these parameters on both the internal and external surfaces of the structure. To establish that for all types of walling with increasing rotation angle, the temperature in the inner corner of the structure decreases, and in the outer increases, and the density of the heat flow behaves vice versa; the distance from the corner to the area stabilization with increasing angle of rotation reduces, smiling for all types of structures for temperature and heat flow; an increase in the thermal resistance leads to a temperature increase and decrease of the heat flux in the corner tend to be developed fragments; issue recommendations for creating energy-efficient structures that meet modern requirements.

References:

1. Abramyan S. G., Burlachenco O. V. 2014. “Low-rise construction: Features and problems of development”. Vestnik Volgogradskogo gosudarstvennogo arhitekturno-stroitelnogo universiteta. Seriya “Stroitelstvo i arkhitektura”, no. 38, pp. 217-227. [In Russian]

2. Andreyceva C. S. 2018. “Features of the calculation of temperature fields in the design of building envelopes”. Zylishnoe stroitelstvo, no. 6, pp. 19-23. [In Russian]

3. Danilov N. D., Fedotov P. A. 2015. “Analysis of the influence of corner joints on the heat loss of external walls”. Zylishnoe stroitelstvo, no. 8, pp. 14-17. [In Russian]

4. Kozlobrodov A. N., Ivanova E. A., Golovko A.V. 2018. “Investigation of the influence of thermal liners on the thermal state of heat-stressed elements of multilayer walling”. Vestnik TGASU, no. 4, pp. 155-169. [In Russian]

5. Kozlobrodov A. N., Ivanova E. A., Kozlobrodov V.A. 2015. “Numerical study of the effect of heat-stressed elements on the thermal state of enclosing structures in low-rise housing construction”. Proceedings of the 2^nd All-Russian Research Conference with International Participation “Energo- i resursoeffectivnost maloetaznyx zilyx zdanii”, pp. 90-97. Novosibirsk: Institut teplofiziki SO RAN. [In Russian]

6. Leonova A. N., Kurochka M. V. 2018. “Methods for improving the energy efficiency of buildings during reconstruction”. Vestnik MGSU. vol. 13, no. 7 (118), pp. 805-813. [In Russian]

7. Nikonova E. V. 2018 “Technical and economic indicators of walling for low-rise construction”. Zylishnoe stroitelstvo, no. 7, pp. 47-50. [In Russian]

8. Samarin O. D. 2014. “Assessment of the minimum temperature in the outer corner of the building when it is rounded”. Promyshlennoe i grazdanskoe stroitelstvo, no. 8, pp. 34-36. [In Russian]

9. Samarin O. D. “Temperature in the linear elements of the building envelope”. 2017. Inzenerno-stroitelniy zurnal, no. 2, pp. 3-10. [In Russian]

10. Terentyev D. M. 2015. “Improving the energy efficiency of buildings, structures and structures. Tasks of the Ministry of Construction of Russia”. Energosberezenie, no. 3, pp. 18-21. [In Russian]

11. Tolstova U. I. 2011. “Heat losses of sharp corners of buildings”. Santekhnika. Otoplenie. Konditsionirovanie, no. 8, pp. 52-53. [In Russian]

12. Usolcev I. E. 2018. “Low-rise construction”. Proceedings of the All-Russian Research Conference of Students, Postgraduates and Early Career Researchers “Nauka I molodez: problem, poiski, resheniya”. Vol. 22, pp. 245-247. [In Russian]

13. Ben Larbi A. 2005. “Statistical Modelling of Heat Transfer for Thermal Bridges of Buildings”. Energy and Buildings. vol. 37, no. 9, pp. 945-951.

14. Psomas T., Heiselberg P., Duer K., Bjørn E. 2016. “Overheating risk barriers to energy renovations of single family houses: multicriteria analysis and assessment”. Energy and Buildings. 2016, no. 117, pp. 138-148.

15. Svitak M., Krontorad K., Tomek J. 2016. “Defining of thermal bridges of wood building and their elimination”. Wood Research, no. 61 (4), pp. 607-614.